(c) Lubrizol's decision to elect to abandon claims 1 and 4 to 9 of the Patent;

(d) Lubrizol's decision to elect to amend claim 1 and delete claim 2 of its United States Patent application;

(e) Lubrizol's decision to elect to file patent applications equivalent to the Patent in the European Patent Office and the United Kingdom which did not claim an equivalent to claim 1 of the Patent;

(f) other matters relevant to any application under section 105 of the 1990 Act. 3 The solicitors for Lubrizol responded on 28 April 1999 enclosing a copy of the Patent bearing the amendments which Lubrizol proposed be made to the Specification and the Claims. The letter said that, pending discussion with counsel, no response would be made at that stage to the orders for discovery suggested by ICI's solicitors. 4 The question of whether any amendment to the body of the Specification is necessary in order to support the validity of claims 2, 3 and 10 to 27 ("the Remaining Claims") is of significance because of ICI's foreshadowed contention that, if Lubrizol seeks to amend, ICI will oppose amendment on discretionary grounds relating to the width of the original claims and will require further discovery in aid of those issues. The question of "disconformity", therefore, is not insignificant. I use the term "disconformity" in these reasons to indicate failure to comply with section 40(3) of the 1990 Act on the ground that the Remaining Claims are not fairly based on the matters contained in the Specification. 5 Lubrizol has now requested that I hear further argument on the question of compliance with section 40(3) of the 1990 Act. ICI opposed that course. I indicated to the parties that I would hear argument on the question of whether or not Lubrizol should be permitted to re-open that question. I also indicated that it was convenient to hear argument on the question of compliance with section 40(3) at the same time, since the matters likely to be raised on the question of re-opening would canvass the substantive issues to be raised if I were disposed to permit such re-opening to hear further argument. I have now heard further argument on both questions.

FURTHER ARGUMENT 6 A Court should not announce a judgment against a person on a ground which that person has not had an opportunity to argue. However, a sufficient opportunity to argue a ground is given when the ground is logically involved in a proposition that has been raised in the course of argument before the Court or is to be considered by the Court as an unconceded step in determining the validity of a conclusion for which one of the parties contends - Autodesk Inc. v Dyason (No. 2) (1993) 176 CLR 300 at 308. 7 A fortiori, where, in the course of argument, one party has raised a ground in express terms, the other party will have had sufficient opportunity to argue that ground. Jurisdiction to permit further argument on such a question ought not to be exercised for the purpose of enabling one party to re-agitate arguments already considered by the Court. Nor should such a jurisdiction be exercised simply because the party seeking the opportunity of further argument has failed to present the argument in all its aspects or as well as it might have been put. Normally, in order to enliven the exercise of such a jurisdiction, it must be established that the Court has apparently proceeded according to some misapprehension of the facts or the relevant law and that such misapprehension cannot be attributed solely to the neglect or default of the parties seeking the opportunity for further argument - per Mason CJ in Autodesk Inc. at 303. 8 Non-compliance with section 40(3) was one of the grounds of invalidity set out in the Amended Particulars of Invalidity filed by ICI in the proceeding. However, the particulars of that ground did not raise the contention that the consequence of abandonment of claims 1 and 4 to 9 ("the Abandoned Claims") would be that the Specification does not comply with section 40(3). Further, the detailed written submissions prepared by ICI on the question of validity did not advance that contention. The basis for Lubrizol's request that I hear further argument is that, because of those circumstances, counsel for Lubrizol did not fully appreciate that ICI was advancing the contention and, accordingly, did not make any submissions in response to the contention. 9 The matter of disconformity between the Remaining Claims and the body of the Specification was raised clearly enough in the course of oral argument. However, it is fair to say that senior counsel for ICI did not put the matter at the forefront of his submissions. The matter arose in connection with the argument as to whether the Patent was obtained on a false suggestion or representation. That was the context in which senior counsel for ICI referred to Weiss v Lufft (1941) 65 CLR 528, the authority upon which ICI based its contention as to nonconformity. However, I am satisfied that the contention was fairly raised on behalf of ICI. It was raised clearly enough for me to accept it and reach the conclusion contended for by ICI in that regard. 10 I should say that, in preparing my earlier reasons, I assumed that the absence of response from Lubrizol on the matter of disconformity was an indication that Lubrizol accepted ICI's contention and that any adverse consequences as far as Lubrizol was concerned would be dealt with by an application to amend under section 105 of the 1990 Act. Because of the assumption I made, I did not deal with the question at any length. 11 ICI contended that Lubrizol's failure to make any response to ICI's contentions concerning disconformity was an incident of the forensic strategy that Lubrizol adopted in the proceeding. As early as 23 October 1998, following the filing of ICI's evidence, which discussed the disclosures made in the Williamitis Patent, Lubrizol informed ICI of its decision that it would not "submit to the Court that claim 1 is valid in the form in which it is expressed". ICI contended that Lubrizol's strategy was adopted to minimise the extent and impact of any proposed amendments. It was suggested that an inference should be drawn that that strategy was adopted in order to avoid or delay the impact of cases which suggest that "once you get into amendment you must provide complete discovery and you must bare your soul in order to gain the benefit of indulgence from the Court" - see for example Wimmera Industrial Minerals Pty Ltd v R.G.C. Mineral Sands Ltd (1998) 40 IPR 110 and the United Kingdom authorities there referred to. 12 In addition, ICI contended that for Lubrizol to suggest now that the disconformity alleged does not affect the validity of the Remaining Claims is to question the very basis of Lubrizol's success on the question as urged by Lubrizol. That is to say, the central proposition of Lubrizol's case, as it developed during the trial was that claims limited to HFCs, as distinct from HCFCs, were novel in the context of the Williamitis Patent and involved an inventive step. It was contended by ICI that my conclusion at paragraphs 158 to 161, to which I have referred above, follows as a consequence of the legal and factual case advanced by Lubrizol, which focussed on the criticality of HFCs in Lubrizol's claims in comparison with the specification of the Williamitis Patent which mentioned HFCs amongst other compounds. 13 ICI contended, therefore, that because the question of disconformity was properly raised, Lubrizol should be required to adopt one of the following courses: (a) to seek to amend, as contemplated in my original reasons, thereby giving rise to questions of discretion and an alternative priority date;

(b) to accept that orders as foreshadowed should be made and then to appeal from those orders;

(c) if Lubrizol wishes to contend that the proposition established by Weiss v Lufft is wrong, to resile from the submissions which stressed the significance of the claims in the Williamitis Patent and to consent to the Court's re-opening the question of novelty.

Lubrizol has not intimated any disposition to adopt the third such course. If my original conclusion stands, it will be necessary for Lubrizol to adopt either the first or the second of those courses.

14 In any event, the question of disconformity should be raised expressly in the record of the proceeding. Accordingly, I directed that ICI formulate a further amendment to the Particulars of Invalidity. That has been done and I propose to give leave to ICI to amend further the Amended Particulars of Invalidity by adding, as a further particular of non-compliance with the requirements of sections 40(2) and 40(3) of the 1990 Act, the following:

"Claims 2, 3 and 10-27 are not fairly based on the matter described in the complete specification. PARTICULARS (i) The claims are limited to cases in which component A of the liquid composition includes at least one fluorine-containing hydrocarbon wherein fluorine is the only halogen present, or is 1,1,1,2-tetrafluoroethane, respectively. (ii) The specification does not support the selection of such components over the other refrigerants disclosed, being fluorine-containing hydrocarbons which also contain halogens other than fluorine. (iii) In the alternative to (ii), the specification is inconsistent with the alleged invention as claimed in the claims in that it describes compositions being fluorine-containing hydrocarbons which are not so limited." 15 In all of the circumstances, I do not consider that I should draw an inference that Lubrizol made a deliberate decision not to make submissions on the question of disconformity. I am satisfied that the failure on the part of Lubrizol to address that question was the result of a misapprehension on the part of counsel for Lubrizol. That misapprehension may have been contributed to, at least in part, by the absence of reference to the question of disconformity in the Particulars of Invalidity and in the written submissions. I do not intend, by that comment, to suggest any criticism of ICI or those representing ICI. On the other hand, even if Lubrizol's position as to abandonment of the Abandoned Claims was not made clear initially, the question of disconformity could have been raised to cover the contingency that ICI succeeded in relation to the Abandoned Claims but failed in respect of the Remaining Claims. 16 This is not a case where orders have been made. Further, the question now raised does not involve any further evidence and the matter was raised as soon as practicable after my earlier reasons had been delivered. Indeed, I am concerned that, in the circumstances, I may have proceeded according to a misapprehension of the facts and the law. I am not satisfied that any such misapprehension should be attributed to the neglect or default of Lubrizol. I consider, therefore, that the interests of justice require that I should have regard to such further submissions as Lubrizol wishes to make in answer to the contention advanced on behalf of ICI on the question of disconformity.

COMPLIANCE WITH SECTION 40(3) 17 In support of its contention that the Remaining Claims are not "fairly based on the matter described in the Specification", ICI pointed to the amendments proposed in the exchange of correspondence to which I have referred above. ICI drew particular attention to the proposed amendments to the body of the Specification, which make clear that the only claims which are to be maintained relate only to a refrigerant which does not contain chlorine. 18 There can be no doubt that the body of the Specification refers to HCFCs, as well as HFCs, as being refrigerants that are the subject of the invention. There is nothing in the Abandoned Claims that limits these claims to refrigerants that contain fluorine as the only halogen. Thus, Lubrizol foreshadowed amendments to delete the Abandoned Claims and to alter the material contained in the body of the Specification referring to HCFCs. That material is contained under the following headings: · Field of the Invention

· Description of the Preferred Embodiments (A) Fluorine-Containing Hydrocarbon. The amendments are designed to limit the matter under those headings to refrigerants wherein fluorine is the only halogen present. I have set out in the appendix to these reasons pages 1, 5, 6, 8, 9, 10, 25, 26, 27 and 28 of the body of the Specification indicating the amendments foreshadowed by Lubrizol.

19 ICI relied on the proposition that, once the Abandoned Claims are removed from the Specification, any references in the body of the Specification to a refrigerant containing chlorine have nothing to do with the invention to which the Patent would then relate. The foreshadowed amendments were said to demonstrate that the body of the Specification is too broad and too general for the Remaining Claims to be fairly based on the matter described in it. 20 The term "fairly based" was first introduced into Australian patent law by the 1952 Act. In the 1952 Act, the term was used in several contexts. In one context, it described the relationship between the claims defining the invention and the matter described in the complete specification. In another it was a criterion for fixing the priority date of a claim of a complete specification that is fairly based on matter disclosed in a preceding provisional specification. The term was also used elsewhere in the 1952 Act, for example, with respect to international applications - see generally CCOM Pty Ltd v Jiejing Pty Ltd (1994) 28 IPR 481 at 496-497. 21 The relationship between the claims defining the invention and the matter described in the complete specification was the subject of section 40(2) of the 1952 Act. That provision is identical to section 40(3) of the 1990 Act. The term "fairly based", when introduced in section 40(2) of the 1952 Act, was apparently a response to the growth of a body of case law dealing with the proposition that a claim should not be wider than warranted by the disclosure made in the body of the specification. At the time of the introduction of the term "fairly based" into Australian patent law, it was not designed to restrict the rights of patentees or applicants for patents. 22 It has been suggested that the meaning of the term, however, was to be understood in the light of the earlier case law. From early in the eighteenth century, letters patent were granted subject to a proviso that obliged the inventor "to describe and ascertain the nature of the said invention, and in what manner the same is to be performed". That proviso was the origin of the modern specification. The proviso served two distinct functions. One was the delimitation of the invention so as to define the monopoly and thereby protected the interests of the grantee. The other was the disclosure of the manner in which the invention was to be performed and thereby protected the interests of the public. The consideration for the monopoly was the free use by the public of the invention at the end of the term of the monopoly, with adequate directions as to how to perform it - see CCOM Pty Ltd v Jiejing Pty Ltd at 497. 23 It is the duty of an inventor, in his or her application for a patent, to give full practical information to the public. Accordingly, the inventor will be bound if, for example, the invention is a process, to include quantities and times that are the best he or she knows. On the other hand, it would be unfair to hold the inventor to such an invention when carried out only with the best quantities and times, because a person could then take the invention in substance if he or she did not take it in quite the best way. The value of the grant would then be virtually nothing - per Fletcher Moulton LJ in British United Shoe Machinery Co. Ltd v A. Fussell & Sons Ltd (1908) 25 RPC 631 at 649-650. 24 Thus, the patentee had an interest in stating his invention in its most general form whereas he was also under a duty to state the invention in its best and therefore in a very special form. For that reason, the practice developed of introducing into specifications language intended to distinguish between that which was there for the practical information of the public and that which was there for the delimitation of the invention. That practice gave rise to the separate part of the specification primarily designed for delimitation, namely, the claims. The body of a specification, on the other hand, must contain sufficient disclosure to the public to support the claims. Clearly, if the disclosure is too narrow for the claims, the claims may not be fairly based on the body of the specification. However, if the body of the specification is so wide that, as a practical matter, it does not disclose to the public the way in which the invention is to be made or used, the specification will not satisfy one of the requirements for the grant of a monopoly for the invention. 25 In Welch Perrin & Co. Pty Ltd v Worrel (1961) 106 CLR 588, the High Court referred to the usual or customary form of a specification. The specification in that case began, after the title, with a preamble stating the subject to which the invention related. That corresponds with the material in the Specification under the heading "Field of the Invention". In accordance with common forms, the specification in Welch Perrin & Co. Pty Ltd went on, by stating the objects of the invention, to show in what ways it was claimed to be in advance of what was previously known. That corresponds with the material under the heading "Background of the Invention" in the Specification. 26 Next, according to the High Court, one might expect to find in a modern specification a general description of what the inventor asserted his invention consisted of, commonly called a "consistory clause". However, that is not an essential part of the body of a specification. It is not required by the legislation and its purpose may be quite well met by the claims themselves. Section 40 of the 1952 Act expressly required the claim or claims to define the invention, as their Honours observed. The High Court referred to the usual practice of using, in the consistory clause, the wording of the broadest of the claims - see generally Welch Perrin & Co. Pty Ltd at pages 610-612. 27 It is common practice for a specification to contain a series of claims descending to more and more particularity in later claims in the hope that, if the earlier should be said to be too wide, the later would be valid and effective to catch some infringers - Welch Perrin & Co. Pty Ltd at 618. Lubrizol relied on the approach adopted by the High Court in that case for the proposition that, while such a form of drafting may make it easier to escape infringement in respect of a narrower claim, there is no suggestion that such a form of drafting will lead to the narrower claim ceasing to have a fair basis because of wider language in the body of the specification. It is no objection to any particular claim that it claims a monopoly for less than every feature described in the body of the relevant specification. It could not be the case, for example, that a claim is restricted to the precise embodiment which is depicted in the body of the specification - see Sartas No. 1 Pty Ltd v Koukourou & Partners Pty Ltd (1994) 30 IPR 479 at 497.

28 In Sartas No. 1 Pty Ltd, Gummow J formulated a number of propositions including the following:

"It is wrong to proceed as if testing for infringement and to seek to isolate in the body of the specification 'essential integers' or 'essential features' of an invention disclosed therein and ask whether they correspond with the essential integers of the claim in question, so that a claim which is silent as to such an essential feature is bad because not fairly based; likewise, it is not a question of whether the earlier provision specification 'fairly described' what are the 'essential features' of the invention disclosed in the late specification." (At 496) 29 The lack of co-extensive operation of two claims in a specification cannot be a ground of objection that either of them is not fairly based on matter described in the specification. The fact that one of the claims in a specification is silent as to what is identified in the body of the specification as a particular "feature" will not result in that claim being not fairly based on the matter contained in the specification. Such an approach would fall into the error identified in the proposition set out above (per Gummow J in Sartos No. 1 Pty Ltd at 497). 30 Thus, a claim may be narrow in the sense that, by reason of its inclusion of a large number of integers, a potential infringer may escape; but it may be a strong claim in the sense that there is a lesser likelihood of anticipation. If the patentee draws a claim that has less integers, the patentee may be in a stronger position as against an infringer, but in a weaker position to withstand an attack on novelty. Nevertheless, it is one thing to say that some of the matter disclosed in the body of a specification is not essential for all of the claims made in that specification. It is another thing altogether, however, for the claims to delimit an invention which is not consistent with matter contained in the body of the specification.

31 Weiss v Lufft (1941) 65 CLR 528, on which ICI placed considerable reliance, was concerned with section 36 of the Patents Act 1903 (Cth), which, clearly enough, was a predecessor of sections 40(2) and 40(3) of the 1990 Act. Section 36 was in the following terms:

"A complete specification must fully describe and ascertain the invention and the manner in which it is to be performed and must end with a distinct statement of the invention claimed." 32 The invention in Weiss v Lufft related to improvements in and relating to rotary intaglio printing. Starke J considered (at page 534) that the amended claim under consideration in that case was so ambiguous that it ought not to be allowed unless radical alterations were made in the body of the specification, bringing it more in accord with the directions contained in section 36 of the Act. Williams J (at page 539) considered that the specification before the Court did not, even in relation to the original claims, describe the invention, because it purported to describe as an invention the whole press, whereas the invention was restricted to certain of its parts. 33 The observations of Williams J at 541, to which I referred in my earlier reasons, must be understood in the light of those other comments. Thus, any statement that the body of a specification must conform to the invention delimited in the claims must be understood in the context of sections 40(2) and 40(3), as the successors of section 36 of the 1903 Act. 34 The body of the Specification presently under consideration refers to liquid compositions wherein the fluorine-containing hydrocarbons may also contain some other halogen such as chlorine (pages 6 and 8). At page 8, the Specification states that "in one preferred embodiment the hydrocarbon contains only carbon, hydrogen and fluorine". The phrase emphasised indicates that it is by no means essential that there be no chlorine. The Specification also gives specific examples of fluorine-containing hydrocarbons useful in the invention. The examples comprise three HCFCs as well as HFC-134a. The three HCFCs, of course, contain chlorine. The amendments foreshadowed by Lubrizol are calculated to limit the body of the Specification to refrigerants in which the only halogen present is fluorine, thereby excluding chlorine: that is to say, to limit the matter to HFCs to the exclusion of HCFCs. That is a radical change. 35 If the invention disclosed by the Patent extends to compositions involving refrigerants that include chlorine, as contemplated by the Abandoned Claims, the invention was anticipated by the Williamitis Patent. That is the basis upon which Lubrizol has abandoned these claims. I have held that the Williamitis Patent, on the other hand, does not anticipate the Remaining Claims. I have found that the essence of the invention for which a patent could be granted is the identification of a soluble organic lubricant, having the properties which I identified in my earlier reasons, which is suitable for use in refrigeration systems with HFCs generally and R-134a in particular. That is to say, it is not concerned at all with refrigerants containing chlorine. 36 The question now under consideration is whether the Remaining Claims are fairly based on the matter that is disclosed in the body of the Specification. Put more precisely, the question is whether a claim for an invention consisting of a composition of an organic lubricant and a refrigerant which must not contain chlorine can be said to be fairly based on matter which says that the refrigerant can contain chlorine. 37 ICI contended that there was a failure to comply with the requirement of section 40(3) because the body of the Specification was "indifferent" to the question of whether or not the refrigerant contains chlorine. Senior counsel for ICI said that the Specification, without amendment, "does not teach you anything special about HFCs". He pointed out that, bearing in mind that the claims are not for a lubricant but for a composition, "there is no teaching [in the Specification] that [compositions] which have HFCs are better [than those that do not]".

38 Under the heading "Summary of the Invention" on page 5 of the Specification, the language of claim 1 appears as the principal part of the consistory clause. That is consistent with the practice referred to by the High Court in Welch Perrin & Co. Pty Ltd. ICI suggested that the consistory clause in the Specification is "indifferent", as it stands, as to whether the refrigerant comprises HCFCs or HFCs. Further, the consistory clause also contains the following statement:

"Liquid compositions also are described wherein the fluorine containing hydrocarbons also contain other halogens such as chlorine."

Clearly that statement is wrong, once the claims in the Specification are limited to refrigerants which are HFCs and do not extend to refrigerants which are HCFCs. 39 Lubrizol contended, in essence, that claims will be fairly based on matter disclosed in a specification if that matter fairly and adequately discloses to the public the manner of performance, manufacture or use of the invention described in those claims. The matter contained in the body of the Specification does disclose, so it was contended, the manner of performing the invention disclosed in the Remaining Claims. The circumstance that it also discloses the manner of performing some different composition is, so Lubrizol contended, not to the point. 40 Thus, chlorine is not mentioned as such in the description of the refrigerant in the consistory clause, even though that description does not exclude chlorine. The description of the refrigerant refers to fluorine, hydrogen and carbon as the elements which must be present in the refrigerant of the invention. They, to use the expression adopted by counsel for Lubrizol, are "the three building blocks in the refrigerant". It was said that, as a matter of construction, the sentence which refers to chlorine was simply saying that, in its broadest form, other building blocks can be added to the basic three but that that is something which is extra to "the three core elements". 41 Under the heading "Description of the Preferred Embodiments" in the Specification, the description of the refrigerant refers to "the fluorine-containing hydrocarbons" as containing "at least one C-H bond as well as C-F bonds". Once again, however, the Specification goes on to refer to the possibility that the refrigerant may also contain carbon chlorine bonds "in addition to these two essential types of bond". That, according, to Lubrizol's contention, is additional information to the requirement of carbon-hydrogen bond and carbon-fluorine bonds as "core essential bonds". 42 The description of the refrigerant then proceeds to state that the refrigerant may contain other halogens such as chlorine. Lubrizol relied on the following as the key sentence for fair basis: "However, in one preferred embodiment, the hydrocarbon contains only carbon, hydrogen and fluorine."

Thus, it was said that there is a basis contained in the Specification for the Remaining Claims. If the only requirement for a claim to be fairly based on the matter contained in a specification is that the manner of performance of the invention comprised in that claim be disclosed in the specification, that requirement is satisfied in relation to the Remaining Claims by the material to which I have just referred. That material discloses how to perform the invention in so far as it consists of a composition of a lubricant and a refrigerant which does not contain chlorine. 43 However, as I have said, the essence of the invention comprised in the Remaining Claims is the identification of a soluble organic lubricant that is suitable for use in refrigeration systems with HFCs. Yet, the Specification clearly contemplates that the invention might be performed with a refrigerant that includes chlorine. Once one accepts that the grant does not extend to the Abandoned Claims, there is matter contained in the Specification that is simply wrong. 44 Where there are several claims in a specification, some claims will be based on only a part of the matter contained in the body of the specification. As I have said above, that of itself is not a basis for complaint. However, if the Specification, when originally lodged, omitted the Abandoned Claims, there would have been a real tension between the disclosure of the invention in the body of the Specification and the delimitation of the invention in the Remaining Claims. It would not so much be a question of disclosure of additional, albeit irrelevant, information. The statements to which I have referred are simply wrong as to what comprises the invention. In that sense, I consider that the Remaining Claims are not fairly based on the matter contained in the Specification, as a whole. They are limited to refrigerants which do not contain chlorine, but the Specification says that the refrigerant element in the composition in which the invention consists can contain chlorine. 45 In the light of the tension between the body of the Specification and the invention as delimited by the Remaining Claims, doubt is raised as to the manner in which the invention so delimited is to be performed. In circumstances where the body of the Specification states that a refrigerant containing chlorine may be comprised in the composition in which the invention consists, there must be doubt created, even in the mind of the skilled reader, as to what was intended by the inventor. 46 Of course, if the history of the application is examined and the presence of the Abandoned Claims in the unamended form of the Specification is observed, the tension can be explained. In other words, the reader would see that claims were originally made but that the grant of a patent was subsequently revoked by consent, in so far as it related to those claims. Nevertheless, as the Specification presently stands, it does not make clear that an essential element of the invention, as delimited in the Remaining Claims and to which the grant of monopoly is limited, is that the refrigerant in the composition must not contain any halogen other than fluorine. 47 That is simply not stated in the Specification as it stands. Indeed, the Specification expressly says the contrary. In the circumstances, I do not consider that the invention comprised in the Remaining Claims is fairly based on the matter contained in the Specification. It follows that the conclusion which I reached in my earlier reasons should stand. 48 ICI has foreshadowed that it will oppose any amendment of the Specification to remove the matter relating to HCFCs. That question is not yet before me. It will only arise if an application is made on behalf of Lubrizol under section 105 of the 1990 Act. Accordingly, I propose to direct the parties to bring in short minutes relating to any proposed application by Lubrizol for amendment pursuant to section 105 of the 1990 Act. I certify that the preceding forty-eight (48) numbered paragraphs are a true copy of the Reasons for Judgment herein of the Honourable Justice Emmett.

Counsel for Lubrizol: J.T Gleeson

Solicitor for Lubrizol: Norton Smith & Co

Counsel for ICI Chemicals & Polymers, Woolworths Ltd, Austral Refrigeration Pty Ltd, Woolworths (Vic) Pty Ltd and Lawrence Refrigeration Pty Ltd: D.K. Catterns QC

Solicitor for the above: Blake Dawson Waldron

Date of Hearing: 5 May 1999

Date of Judgment: 20 May 1999

This invention relates to liquid compositions comprising a major amount of at least one fluorine-containing hydrocarbon *, and a minor amount of at least one lubricant. More particularly, the invention relates to liquid compositions useful as refrigeration liquids.

Chlorofluorocarbons, generally referred to in the industry as CFCs, have been widely used as propellants in aerosols, although use in aerosols has been diminishing in recent years because of demands of environmentalists for the reduction if not a complete ban on the use of CFCs because of the detrimental effect of CFCs on the stratosphere's ozone layer. CFCs also have been used because of their unique combination of properties as refrigerants, foam-blowing agents and specialty solvents within the electronics and aerospace industries. Examples of CFCs which have been utilized for these purposes include CFC-11 which is chlorotrifluoromethane, CFC-12 which is dichlorodifluoromethane, and CFC-113 which is 1,2,2-trifluoro-1,1,2-trichloroethane.

Since 1976, when the aerosol industry began to feel the pressure to reduce if not eliminate the use of CFCs, the aerosol industry has progressively moved

esters, epoxy compounds and organotin compounds. The polyethylene glycol methyl ether-type compounds are of the general formula

wherein n is an integer of 1 to 6, and R is H, CH3- or CH3CO-. A variety of halogenated hydrocarbons are described including 1,1,-difluoromethane, 1,1,1,2,-tetrafluoromethane, etc. U.S. Patent 4,559,154 relates to absorption heat pumps utilizing as working fluid, a saturated fluorohydrocarbon or fluorohydrocarbon ether having from 3 to 5 carbon atoms. Solvents reported to be useful with such fluorohydrocarbons include ethers such as tetraglyme, amides which can be lactams such as the N-alkyl pyrrolidones, sulfonamides and ureas including cyclic ureas.

(A) a major amount of at least one fluorine containing hydrocarbon containing one or two carbon atoms * and

(B) a minor amount of at least one soluble organic lubricant comprising at least one carboxylic ester of a polyhydroxy compound containing at least 2 hydroxy groups and characterised by the general formula

wherein R is a hydrocarbyl group, each R1 is independently hydrogen, a straight chain lower hydrocarbyl

group, a branched chain hydrocarbyl group, or a straight chain hydrocarbyl group containing from 8 to about 22 carbon atoms provided that at least one R1 group is hydrogen, a lower straight chain hydrocarbyl or a branched chain hydrocarbyl group or a carboxylic acid or carboxylic acid ester-containing hydrocarbyl group, and n is at least 2.

Liquid compositions are also described wherein the fluorine containing hydrocarbons also contain other halogen such as chlorine. The liquid compositions are useful particularly as refrigeration liquids in refrigerators and air-conditioners including auto, home and industrial air-conditioners.

Throughout this specification and claims, all parts and percentages are by weight, temperatures are in degrees Celsius, and pressures are at or near atmospheric pressure unless otherwise clearly indicated.

As used in this specification and in the appended claims, the terms "hydrocarbyl" and "hydrocarbylene" denote a group having a carbon atom directly attached to the polar group and having a hydrocarbon or predominantly hydrocarbon character within the context of this invention. Such groups include the following:

(1) Hydrocarbon groups: that is, aliphatic, (eg. alkyl or alkenyl), alicyclic (eg. cycloalkyl or cycloalkenyl) and the like, as well as cyclic groups wherein the ring is completed through another portion of the molecule (that is, any two indicated substituents may together form an alicyclic group). Such groups are known to those skilled in the art. Examples include methyl, ethyl, octyl, decyl, octadecyl, cyclohexyl, etc.

(2) Substituted hydrocarbon groups, that is, groups containing non-hydrocarbon substituents which, in

liquid compositions, even though it may be insoluble in the fluorine-containing hydrocarbon per se.

The liquid compositions of the present invention comprise a major amount of at least one fluorine-containing hydrocarbon*. That is, the fluorine-containing hydrocarbons contain at least one C-H bond as well as C-F bonds. In addition to these two essential types of bonds, the hydrocarbon also may contain other carbon-halogen bonds such as C-Cl bonds. Because the liquid compositions of the present invention are primarily intended for use as refrigerants, the fluorine-containing hydrocarbon preferably contains one or two carbon atoms, and more preferably two carbon atoms.

As noted above, the fluorine-containing hydrocarbons useful in the liquid compositions of the present invention may contain other halogens such as chlorine. However, in one preferred embodiment the hydrocarbon contains only carbon, hydrogen and fluorine. These compounds containing only carbon, hydrogen and fluorine are referred to herein as fluorohydrocarbons. The h[H]ydrocarbons containing chlorine as well as fluorine and hydrogen are referred to as chlorofluorohydrocarbons. The fluorine-containing hydrocarbons useful in the composition of the present invention are to be distinguished from the fully halogenated hydrocarbons which have been and are being used as propellants, refrigerants and blowing agents such as CFC-11, CFC-12 and CFC-113 which have been described in the background.

[A s]Specific examples of the [a] fluorine-containing hydrocarbons useful in the liquid compositions of the present invention, and [its] their reported ozone depletion potentials are [is] shown in the following Table I.

TABLE I Compound Formula ODP# Designation HCFC-22 CHClF2 0.05 HCFC-133 CHCl2CF3 <0.05 HCFC-141b CH3CCl2F <0.05 HFC-134a CH2FCF3 0

Ozone depletion potential as reported in Process Engineering, pp. 33-34, July 1988.

Examples of other fluorine-containing hydrocarbons which may be useful in the liquid compositions of the present invention include trifluoromethane (HFC-23), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124), 1-chloro-1,1,2,2-tetrafluoroethane (HCFC-124a), 1-chloro-1,1-difluoroethane (HCFC-142b) and 1,1,2,2-tetrafluoroethane (HFC-134). In the refrigerant art, the fluorohydrocarbons are often identified merely with the prefix "R" in place of the above letters. For example, HFC-23 is R-23, HCFC-124 is R-124 etc.

In general, fluorine-containing hydrocarbons which are useful as refrigerants are fluoromethanes and fluoroethanes boiling at a relatively low temperature at atmospheric pressure, eg. below 30°C. Mixtures of fluorine-containing hydrocarbons may be used, and the amount of each fluorohydrocarbon in the mixture may be varied as desired. [An] Examples of [a] fluorohydrocarbon mixtures useful as (A) include[s]: 142(b)/22; 134(a)/23; 22/124/152(a), etc. The useful fluorocarbon refrigerants serve to transfer heat in a refrigeration system by evaporating and absorbing heat at a low temperature and pressure, eg. at ambient temperature and atmospheric

pressure and by releasing heat on condensing at a higher temperature and pressure.

The liquid compositions of the present invention contain a major amount of the fluorine-containing hydrocarbon. More generally, the liquid compositions will comprise from about 50% to about 99% by weight of the fluorine-containing hydrocarbon. In another embodiment, the liquid compositions contain from about 70% to about 99% by weight of the fluorine-containing hydrocarbon.

(B) Soluble Organic Lubricant In addition to the fluorine-containing hydrocarbon described above, the liquid compositions of the present invention also contain a minor amount of at least one carboxylic ester of a polyhydroxy compound containing at least two hydroxy groups and characterised by the general formula

wherein R is a hydrocarbyl group, each R1 is independently hydrogen, a straight chain lower hydrocarbyl group, a branched chain hydrocarbyl group, or a straight chain hydrocarbyl group containing from about 8 to about 22 carbon atoms provided that at least one R1 group is hydrogen, a lower straight chain hydrocarbyl or a branched chain hydrocarbyl group, or a carboxylic acid or carboxylic ester-containing hydrocarbyl group, and n is at least 2.

The carboxylic ester lubricants utilized as component (B) in the liquid compositions of the present invention are reaction products of one or more carboxylic acids (or the lower esters thereof such as methyl,

Product of Example °C (ppt.) 6 -45 10 -50 11 -40 12 -50 13 -15 15 -30 16 10 17 -25 19 -10

The liquid compositions of the present invention comprise a major amount of a fluorine-containing hydrocarbon and a minor amount of at least one soluble organic lubricant comprising at least one carboxylic ester (I). By "major amount" is meant an amount greater than 50% by weight such as 50.5%, 70%, 99% etc. The term "minor amount" includes amounts less than 50% by weight such as 1%, 5%, 20%, 30% and up to 49.9%. In one embodiment, the liquid compositions of the present invention will comprise from about 70% to about 99% of the fluorine-containing hydrocarbon and from about 1 to about 50% by weight of the lubricant. In other embodiments, the liquid compositions of the present invention may contain from about 5% to about 20% by weight of the lubricant.

The liquid compositions of the present invention are characterised as having improved thermal and chemical stability over a wide temperature range. Other additives, if soluble in the liquid, known to be useful for improving the properties of halogen*-containing hydro-

carbon refrigerants can be included in the liquid compositions of the present invention to improve the characteristics of the liquid as a refrigerant. However, hydrocarbon oils such as mineral oil generally are not included in and are most often excluded from the liquid compositions of the invention particularly when the fluorine-containing hydrocarbon contains no other halogen. The additives which may be included in the liquid compositions of the present invention to enhance the performance of the liquids include extreme pressure and anti-wear agents, oxidation and thermal-stability improvers, corrosion-inhibitors, viscosity-index improvers, pour point and/or floc point depressants, detergents, dispersants, anti-foaming agents, viscosity adjusters etc. As noted above, these supplementary additives must be soluble in the liquid compositions of the invention. Included among the materials which may be used as extreme-pressure and anti-wear agents are phosphates, phosphate esters, phosphites, thiophosphates such as zinc diorganodithiophosphates, chlorinated waxes, sulfurized fats and olefins, organic lead compounds, fatty acids, molybdenum complexes, borates, halogen-substituted phosphorous compounds, sulfurized Diels Alder adducts, organic sulfides, metal salts of organic acids, etc. Sterically hindered phenols, aromatic amines, dithiophosphates, phosphites, sulfides and metal salts of dithioacids are useful examples of oxidation and thermal stability improvers. Compounds useful as corrosion-inhibitors include organic acids, organic amines, organic phosphates, organic alcohols, metal sulfonates, organic phosphites, etc. VI improvers include polyolefins such as polyesterbutene, polymethac-

rylate, polyalkyl styrenes, etc. Pour point and floc point despressants include polymethacrylates, ethylene-vinyl acetate copolymers, succinamic acid-olefin copolymers, ethylene-alpha olefin copolymers, etc. Detergents include sulfonates, long-chain alkyl-substituted aromatic sulfonic acids, phosphonates, phenylates, metal salts of alkyl phenols, alkyl phenol-aldehyde condensation products, metal salts of substituted salicylates, etc. Silicone polymers are a well known type of anti-foam agent. Viscosity adjusters are exemplified by polyisobutylene, polymethacrylates, plyalkyl styrenes, naphthenic oils, alkyl benzene oils, polyesters, polyvinyl chloride, polyphosphates, etc.

The liquid compositions of the present invention are particularly useful as refrigerants in various refrigeration systems which are compression-type systems such as refrigerators, freezers, and air-conditioners including automotive, home and industrial air-conditioners. The following examples are illustrative of the liquid compositions of the present invention.

Parts by Wt Example A 90 1,1,1,2-tetrafluoroethane (HCFC[HFC]-134a) 10 Lubricant of Example 2 Example B 85 1,1,2,2-tetrafluoroethane 15 Lubricant of Example 4 Example C 95 HCFC [HFC]-134a 5 Lubricant of Example 6 Example D 80 HCFC [HFC]-134a 20 Product of Example 1

While the invention has been explained in relation to its preferred embodiments, it is to be understood that various modifications thereof will become apparent to those skilled in the art upon reading the specification. Therefore, it is to be understood that the invention disclosed herein is intended to cover such modifications as fall within the scope of the appended claims.