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`PROVISIONAL APPLICATION FOR PA TENT COVER SHEET
`33-‘ :3
`This is a request for filing a PROVISIONAL APPLICATION FOR PATENT under 37 CFR 1.53(c).
`
`lllllllllll
`Cznlsz/oillllllllllll
`
`
`
`
`
`
`Family Name or Surname
`Singh
`
`Residence
`
`Cit and either State or Forein Count
`Given Name (first and middle [if any})
`Getzville, NY 14068
`Rajiv R.
`Amherst, NY 14228
`Hang T.
`East Amherst, NY 14051
`David P.
`Pendleton, NY 14094
`_ Raymond H.
`separately numbered sheets attached hereto
`E Additional inventors are being named on Iht
`TITLE OF THE INVENTION (280 characters max)
`AZEOTROPE AND AZEOTROPE-LIKE COMPOSITIONS OF 1,1,3,3,3—PENTAFLUOROPROPENE WITH 1,1-DIFLUOROETHANE OR
`WITH 3,3,3-TRIFLUOROPROPENE
`
`
`
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`
`CORRESPONDENCE ADDRESS
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`Individual Name
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`Peter J. Butch, Ill
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`1101 Market Street, Suite 2600
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`Telephone 215-923-4466
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`ENCLOSED APPLICATION PARTS (check all that agply)
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`Payment by credit card. Form PTO-2038 is attached.
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`The invention was made by an agency of the United States Government or under a contract with an agency of the
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`1 0/25/2002
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`Respectfully sub i
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`SIGNATURE
`TYPED or pR|NTED NA E Peter J. BUtCI1, III
`215-923-4466
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`USE ONLY FOR FILING A PROVISIONAL APPLICATION FOR PA TENT
`This collection of information is required by 37 CFR 1.51. The information is used by the public to file (and by the PTO to process) a provisional
`application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.14. This collection is estimated to take 8 hours to complete, including
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`COMPLETED FORMS TO THIS ADDRESS. SEND TO: Box Provisional Application, Assistant Commissioner for Patents, Washington, D.C.
`P1 QLARGE/REVO5
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`32.203
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`P26,268 USA
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`Page 1 Of 14
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`Arkema Exhibit 1036
`
`Date
`REGISTRATION NO.
`(If appropriate)
`Docket Number:
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`Page 1 of 14
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`Arkema Exhibit 1036
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`

`
`
`
`AZEOTROPE AND AZEOTROPE-LIKE COMPOSITIONS OF
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`1 ,1,3,3,3-PENTAFLUOROPROPENE WITH 1,1-DIFLUOROETHANE OR WITH
`
`3,3,3- TRIFLUOROPROPENE
`
`BACKGROUND OF THE INVENTION
`
`This invention relates to azeotrope-like or oonstant~boiling mixtures of 1,1,3,3,3-
`
`pentafluoropropene (HFO—1225) and 1,1—difluoroethane (HFC—152a) or 3,3,3-
`
`trifluoropropene (HFO-1243). These mixtures are useful as refrigerants for heating and
`
`cooling and as blowing agents and as aerosol propellants and as fire extinguishing and
`suppressing agents.
`
`Fluorocarbon based fluids have found widespread use in industry for refrigeration
`
`applications such as air conditioning and heat pump applications. Vapor compression is one
`
`form of refrigeration.
`
`In its simplest form, vapor compression involves changing the
`
`refrigerant from the liquid to the vapor phase through heat absorption at a low pressure and
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`then from the vapor to the liquid phase through heat removal at an elevated pressure.
`
`While the primary purpose of refrigeration is to remove energy at low temperature,
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`the primary purpose of a heat pump is to add energy at higher temperature. Heat pumps
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`are considered reverse cycle systems because for heating, the operation of the condenser
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`is interchanged with that of the refrigeration evaporator.
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`Certain chlorofluoromethane and chlorofluoroethane derivatives have gained
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`widespread use as refrigerants in applications including air conditioning and heat pump
`
`applications owing to their unique combination of chemical and physical properties. The
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`30
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`majority of refrigerants utilized in vapor compression systems are either single component
`fluids or azeotropic mixtures.
`
`Azeotropic or azeotrope-like compositions are desired as refrigerants because they
`
`do not fractionate upon boiling. This behavior is desirable because in the previously
`
`described vapor compression equipment with which these refrigerants are employed,
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`35
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`condensed material is generated in preparation for cooling or for heating purposes. Unless
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`the refrigerant composition exhibits a constant boiling point, i.e. is azeotrope—|ike,
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`

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`Patent
`
`
`Attorney Docket No. HOO4469 (4510)
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`fractionation and segregation will occur upon evaporation and condensation and undesirable
`
`refrigerant distribution may act to upset the cooling or heating. Furthermore, if a leak occurs
`
`in a refrigeration system during use or service, the composition of the azeotrope-like mixture
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`does not change and thus, system pressures and system performance remain unaffected.
`
`The art is continually seeking new fluorocarbon and hydrofluorocarbon based
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`azeotrope-like mixtures that offer alternatives for refrigeration and heat pump applications.
`
`Fluoroolefin based azeotrope-like mixtures are of particular interest because they are
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`considered to be environmentally safer substitutes for the presently used fluoroalkanes
`
`(FAs), which are suspected of causing global warming.
`
`Substitute refrigerants must also possess those properties unique to the FA
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`refrigerants including similar refrigeration characteristics, chemical stability, low toxicity, non-
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`flammability, and efficiency in use. The latter characteristic is important in refrigeration and
`
`air-conditioning especially where a loss in refrigerant thermodynamic performance or energy
`
`efficiency may have secondary environmental impacts through increased fossil fuel usage
`
`arising from an increased demand for electrical energy. Furthermore, the ideal CFC
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`refrigerant substitute would not require major engineering changes to conventional vapor
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`compression technology currently used with CFC refrigerants. Mathematical models have
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`substantiated that fluoro-olefins, such as (HFO-1225), and hydrofluorocarbons, such as
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`1,1—difluoroethane (HFC-152a) will not adversely affect atmospheric chemistry, being
`
`negligible contributors to ozone depletion in comparison to other halogenated species.
`
`HFC-152a might be considered to be a refrigerant substitute for Ft—134a. However,
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`HFC—152a is disadvantageous to use as a refrigerant because of its flammabilty, which
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`results in possible hazards in refrigeration machines. The same is true of HFO—1243.
`
`Examples of azeotrope-like compositions of HFO-1225 are not known in the
`literature.
`
`Refrigerant blends containing HFC—152a have been disclosed. For example
`
`American Society of Heating and Air Conditioning Engineers’ (ASHRAE) Standard -34
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`discloses refrigerants Ft-401 A and Ft-401 B which contain several percent by weight of HFC-
`152a.
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`

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`Patent
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`is
`1::
`Attorney Docket No. HOO4469 (4510)
`
`
`
`Bromofluoromethane and bromochlorofluoromethane derivatives, particularly
`
`bromotrifluoromethane (Halon 1301) and bromochlorodifluoromethane (Halon 1211) have
`
`gained widespread use as fire extinguishing agents in enclosed areas such as airplane
`
`cabins and computer rooms. However, the use of various halons is being phased out due to
`
`their high ozone depletion. Moreover, as halons are frequently used in areas where humans
`
`are present, suitable replacements must also be safe to humans at concentrations
`
`necessary to suppress or extinguish fire.
`
`DETAILED DESCRIPTION OF THE INVENTION
`
`The present inventors have developed several compositions that can help to satisfy
`the continuing need for substitutes for CFCs and HCFCs.
`In one embodiment, the present
`
`invention provides azeotrope and azeotrope-like compositions comprising 1,1 ,3,3,3-
`
`penlalluoropropene (HFO—1225) and 1,1—difluoroethane (HFC-152a) or 1,1 ,3,3,3~penta-
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`fluoropropene and 3,3,3-trifluoropropene (HFO-1243) or 1,1 ,3,3,3—pentafluoropropene and
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`1,1-difluoroethane and 3,3,3—trifluoropropene.
`
`The preferred compositions of the invention provide environmentally desirable, zero
`
`ozone depletion potential replacements for currently used CFC’s and HCFC’s. Additionally,
`
`the compositions of the invention exhibit characteristics that make the compositions better
`
`CFC and HCFC substitutes than any of 1,1 ,3,3,3—pentafluoropropene or 1,1—difluoroethane
`
`or 3,3,3—trifluoropropene alone.
`
`The Compositions
`
`The present compositions are azeotrope-like compositions. As used herein, the term
`
`“azeotrope-like" is intended in its broad sense to include both compositions that are strictly
`
`azeotropic and compositions that behave like azeotropic mixtures. From fundamental
`
`principles, the thermodynamic state of a fluid is defined by pressure, temperature, liquid
`
`composition, and vapor composition. An azeotropic mixture is a system of two or more
`
`components in which the liquid composition and vapor composition are equal at the stated
`
`pressure and temperature.
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`In practice, this means that the components of an azeotropic
`
`mixture are constant boiling and cannot be separated during a phase change.
`
`Azeotrope-like compositions are constant boiling or essentially constant boiling.
`
`In
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`other words, for azeotrope-like compositions, the composition of the vapor formed during
`
`boiling or evaporation is identical, or substantially identical, to the original liquid composition.
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`

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`Patent
`
`
`Attorney Docket No. HO0:l469 (4510)
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`Thus, with boiling or evaporation, the liquid composition changes, if at all, only to a minimal
`
`or negligible extent. This is to be contrasted with non—azeotrope—like compositions in which,
`
`during boiling or evaporation, the liquid composition changes to a substantial degree. All
`
`azeotrope—like compositions of the invention within the indicated ranges as well as certain
`
`compositions outside these ranges are azeotrope—like.
`
`The azeotrope-like compositions of the invention may include additional components
`
`that do not form new azeotrope-like systems, or additional components that are not in the
`
`first distillation cut. The first distillation cut is the first out taken after the distitlation column
`
`displays steady state operation under total reflux conditions. One way to determine whether
`
`the addition of a component forms a new azeotrope—like system so as to be outside of this
`
`invention is to distill a sample of the composition with the component under conditions that
`
`would be expected to separate a non—azeotropic mixture into its separate components.
`the mixture containing the additional component is non-azeotrope-like, the additional
`component will fractionate from the azeotrope-like components.
`If the mixture is azeotrope-
`like, some finite amount of a first distillation cut will be obtained that contains all of the
`
`If
`
`mixture components that is constant boiling or behaves as a single substance.
`
`It follows from this that another characteristic of azeotrope-like compositions is that
`
`there is a range of compositions containing the same components in varying proportions
`that are azeotrope—like or constant boiling. All such compositions are intended to be
`
`covered by the terms “azeotrope—like” and “constant boi|ing”. As an example, it is well
`known that at differing pressures, the composition of a given azeotrope will vary at least
`slightly, as does the boiling point of the composition. Thus, an azeotrope of A and B
`
`represents a unique type of relationship, but with a variable composition depending on
`
`temperature and/or pressure.
`
`it follows that, for azeotrope—like compositions, there is a
`
`range of compositions containing the same components in varying proportions that are
`
`azeotrope-like. All such compositions are intended to be covered by the term azeotrope—like
`as used herein.
`
`The present invention provides azeotrope and azeotrope-like compositions
`
`comprising 1,1,3,3,3-pentafluoropropene and 1,1-difluoroethane or 1,1,3,3,3-pentafluoro-
`
`propene and 3,3,3—trif|uoropropene or 1,1,3,3,3-pentafluoropropene and 1,1—difluoroethane
`
`and 3,3,3—trifluoropropene.
`
`Preferably, the novel azeotrope and azeotrope-like compositions of the present
`invention comprise effective amounts of 1,1,3,3,3-pentafluoropropene and 1,1—difluor0-
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`Page 5 of 14
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`

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`Patent
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`iiiiéi.
`Attorney Docket No. HO0zf:1'é9 (4510)
`
`
`
`ethane or 1,1,3,3,3-pentafluoropropene and 3,3,3—trifluoropropene or 1,1,3,3,3—penta—
`
`fluoropropene and 1,1-difluoroethane and 3,3,3-trifluoropropene.
`
`The term “effective amounts” as used herein refers to the amount of each
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`5
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`component which upon combination with the other component or components, results in the
`
`formation of the present azeotrope and azeotrope—|ike compositions.
`
`Preferred embodiments provide azeotrope and azeotrope-like compositions
`
`comprising, and more preferably consisting essentially of, from about 20 to about 90 weight
`
`10
`
`percent 1,1,3,3,3—pentaf|uoropropene (HFO-1225) and about 80 to about 20 weight percent
`
`1,2-difluoroethane (HFC—152a), which have a boiling point of - 24:2°C, preferably :1: 1 °C, at
`
`14.61 psia.
`
`In other preferred embodiments, azetrope and a2eotrope—|ike compositions
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`15
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`comprise, and more preferably consist essentially of, about 20 to about 90 weight percent
`
`1,1,3,3,3-pentafluoropropene (HFO—1225) and about 80 to about 20 weight percent 3,3,3-
`
`trifluoropropene (HFO—1248), which have a boiling point of - 25i3°C, preferably : 2 "C,
`
`more preferably i 1 °C at 14.61 psia.
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`20
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`The preferred, more preferred, and most preferred compositions of these
`
`embodiments are set forth in Table 1. The numerical ranges in Table 1 are to be under-
`
`stood to be prefaced by the term “about”. All compositions within the indicated ranges, as
`
`well as certain compositions outside the indicated ranges, are azeotrope or azeotrope-like.
`
`Table 1
`
`
`
`
`
`
`
`, COMPONENTS ‘
`1
`
`PREFERRED
`RANGE
`(WT%)
`
`MOST
`Boiling Point
`MORE
`PREFERRED
`(°C)
`PREFERRED
`RANGE
`at Atmospheric
`RANGE
`(WT.%)
`Pressure
`(WT.%)
`3 —o- 50 —-24:t 2 3 3
`
`
`5 - 25
`3'HFO-1225 —-
`
`5 — 75
`HFC—152a
`1 - 90
`
`
`
`
`
`
`
`
`
`25
`
`30
`
`
`
`HFO-1225 '
`
`’
`
`HFO-1243
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`Page 6 of 14
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`

`
`Patent
`
`Uses of the Compositions
`L,-
`
`33:5
`
`Attorney Docket No. H0042169 (4510)
`
`The compositions of the present invention may be used in a wide variety of
`
`applications as substitutes for CFCs and HCFCs. For example, the present compositions
`
`are useful as solvents, blowing agents, refrigerants, cleaning agents and aerosols.
`
`One embodiment of the present invention relates to a blowing agent comprising one
`
`or more of the azeotrope and azeotrope—like compositions of the invention.
`
`In other
`
`embodiments, the invention provides foamable compositions, and preferably polyurethane
`
`and polyisocyanurate foam compositions, and methods of preparing foams.
`
`In such foam
`
`embodiments, one or more of the present azeotrope and azeotrope—like compositions are
`
`included as a blowing agent in a foamable composition, which composition preferably
`
`includes one or more additional components capable of reacting and foaming under the
`
`proper conditions to form a foam or cellular structure, as is well known in the art. The
`
`present methods preferably comprise providing such a foamable composition and reacting it
`
`under conditions effective to obtain a foam, and preferably a closed cell foam. The
`
`invention also relates to foam, and preferably closed cell foam, prepared from a polymer
`
`foam formulation containing a blowing agent comprising the azeotrope-like composition of
`the invention.
`
`Any of the methods well known in the art, such as those described in “Polyurethanes
`
`Chemistry and Technology,” Volumes I and II, Saunders and Frisch, 1962, John Wiley and
`
`Sons, New York, NY, which is incorporated herein by reference, may be used or adapted for
`
`use in accordance with the foam embodiments of the present invention.
`
`In general, such
`
`preferred methods comprise preparing polyurethane or polyisocyanurate foams by
`
`combining an isocyanate, a polyol or mixture of polyols, a blowing agent or mixture of
`
`blowing agents comprising one or more of the present compositions, and other materials
`
`such as catalysts, surfactants, and optionally, flame retardants, colorants, or other additives.
`
`It is convenient in many applications to provide the components for polyurethane or
`
`polyisocyanurate foams in pre—b|ended formulations. Most typically, the foam formulation is
`
`pre—blended into two components. The isocyanate and optionally certain surfactants and
`
`blowing agents comprise the first component, commonly referred to as the “A” component.
`
`The polyol or polyol mixture, surfactant, catalysts, blowing agents, flame retardant, and
`other isocyanate reactive components comprise the second component, commonly referred
`
`to as the “B” component. Accordingly, polyurethane or polyisocyanurate foams are readily
`
`prepared by bringing together the A and B side components either by hand mix for small
`
`preparations and, preferably, machine mix techniques to form blocks, slabs, laminates,
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`

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`Patent
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`.241‘0..
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`Attorney Docket No.
`
`
`[(4510)
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`pour—in-place panels and other items, spray applied foams, froths, and the like. Optionally,
`
`other ingredients such as fire retardants, colorants, auxiliary blowing agents, and even other
`
`polyols can be added as a third stream to the mix head or reaction site. Most conveniently,
`
`however, they are all incorporated into one B—component as described above.
`
`It is also possible to produce thermoplastic foams using the compositions of the
`
`invention. For example, conventional foam polyurethanes and isocyanurate formulations
`
`may be combined with the azeotrope and azeotrope—like compositions in a conventional
`
`manner to produce rigid foams.
`
`Dispersing agents, cell stabilizers, and surfactants may also be incorporated into the
`
`blowing agent mixture. Surfactants, better known as silicone oils, are added to serve as cell
`
`stabilizers. Some representative materials are sold under the names of DC-193, B—8404,
`
`and L-5340 which are, generally, polysiloxane polyoxyalkylene block co—polymers such as
`
`those disclosed in U.S. Patent Nos. 2,834,748, 2,917,480, and 2,846,458. Other optional
`
`additives for the blowing agent mixture may include flame retardants such as tri(2—
`
`ch|oroethy|)phosphate, tri(2—chloropropy|)phosphate, tri(2,3-dibromopropyI)-phosphate,
`
`tri(1,3—dichloropropyl)phosphate, diammonium phosphate, various halogenated aromatic
`
`compounds, antimony oxide, aluminum trihydrate, polyvinyl chloride, and the like.
`
`in another embodiment, the azeotrope and azeotrope—like compositions of this
`
`invention may be used as propellants in sprayable compositions, either alone or in
`
`combination with known propellants. The sprayable composition comprises, consists
`
`essentially of, and consists of a material to be sprayed and a propellant comprising,
`
`consisting essentially of, and consisting of the azeotrope and azeotrope—like compositions of
`
`the invention.
`
`Inert ingredients, solvents, and other materials may also be present in the
`
`sprayable mixture. Preferably, the sprayable composition is an aerosol. Suitable materials
`
`to be sprayed include, without limitation, cosmetic materials such as deodorants, perfumes,
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`hair sprays, cleansers, and polishing agents as well as medicinal materials such as anti—
`asthma and anti—halitosis medications.
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`In another process embodiment of the invention, the azeotrope and azeotrope-like
`
`Compositions of the invention may be used in a method for producing heating which
`
`comprises condensing a refrigerant comprising the azeotrope and azeotrope—like
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`35
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`compositions in the vicinity of a body to be heated and thereafter evaporating the
`
`refrigerant.
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`Page 8 of 14
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`

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`
`
`Patent
`
`Attorney Docket No. HOO4469 (4510)
`
`In yet another process embodiment of the invention, the azeotrope and azeotrope-
`
`like compositions of the invention may be used in a method for producing refrigeration which
`
`comprises condensing a refrigerant comprising the azeotrope and azeotrope-like
`
`compositions and thereafter evaporating the refrigerant in the vicinity of a body to be cooled.
`
`The present azeotrope and azeotrope-like compositions are advantageous for the
`
`following reasons. Each component is a negligible contributor to ozone depletion. Because
`
`the present compositions exhibit essentially azeotropic characteristics, the liquid mixture will
`
`show relatively minor shifts in composition during evaporation. This is advantageous in a
`
`vapor compression cycle as the azeotrope and azeotrope-like compositions mimic the
`
`performance of a constant-boiling single component refrigerant.
`
`Additional components may be added to the mixture to tailor the properties of the
`
`mixture according to the need. For example, in the art, propane has been added to
`
`refrigerant compositions to aid oil solubility and may be added to the azeotrope and
`
`azeotrope-like compositions of HFO—1225, HFC—152a and HFO-1243. Similar materials
`
`may be added to the present mixture. Commonly used refrigeration oils such as Polyol
`
`Esters (POEs) and Poly Alkylene Glycols (PAGs) that are used in refrigeration machinery
`
`with hydrofluorocarbon(HFC) refrigerants may be used with the claimed mixtures
`
`Furthermore, HFO-1243 and HFO-1225 have been found to be exceptionally stable
`
`and compatible with the POE and PAG refrigeration lubricants. This level of stability is
`
`surprising and makes these compounds very suitable for use with these lubricants in
`
`refrigeration processes.
`
`The HFO—1225, HFC-152a and HFO-1243 of the novel azeotrope and azeotrope-like
`
`compositions of the invention are known materials and are commercially available, from
`
`example from Syntex Chemical Co.. Preferably, the materials should be used in sufficiently
`
`high purity so as to avoid the introduction of adverse influences upon the cooling or heating
`
`properties or constant-boiling properties of the system.
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`Patent
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`Attorun
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`ey Docket No. HOO4469 (4510)
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`EXAMPLES
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`EXAMPLES 1 — 2
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`10
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`15
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`An ebulliometer as described by Swietoslowski
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`in his book “Ebu||iometric
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`Measurements” (Ftheinhold, 1945) was used. HFO—1225 was charged into the ebulliometer
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`and the second component was added in small measured increments by an automated
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`syringe capable of injecting microliters. The temperature was measured using a platinum
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`resistance thermometer and barometric pressure was measured. An approximate
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`correction to the boiling point was done to obtain the boiling point at 760 mm Hg
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`EXAMPLE 1
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`HFO-1225 (16.19g) was charged to the ebullometer. HFC-152a was added in small
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`measured increments. Compositions were tested ranging between 85.9 and 98.8 weight
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`percent HFO~1225 and 1.2 and 14.1 weight percent HFC—152a. The boiling point of the
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`compositions changed by less than 1°C over the range tested. Therefore, the compositions
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`behave as constant—boiling compositions over this range. The boiling points of certain
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`compositions were lower than that of either of the two components, showing the existence of
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`20’
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`a true azeotrope as well.
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`EXAMPLE 2
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`25
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`30
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`35
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`HFO-1225 (10.40 gm) was charged to the ebullometer and metered amounts of
`HFO;1243 was added in small measured increments. Compositions were tested ranging
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`between 78.7 and 97.2 weight percent HFO-1225 and 2.8 and 21.3 weight percent HFC—
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`1243. The boiling point of the compositions changed by less than 1°C over the range
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`tested. Therefore, the compositions behave as constant—boiling compositions over this
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`range. The boiling points of certain compositions were lower than that of either of the two
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`components, showing the existence of a true azeotrope as well.
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`EXAMPLES 3-20
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`These examples show that the constantvboiling blends of the present invention have
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`certain advantages when compared to other refrigerants which are currently used in certain
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`refrigeration cycles.
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`Patent
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`Attgrn
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`9; DocketNo. HOO4:59 (4510)
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`The theoretical performance of a refrigerant at specific operating conditions can be
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`estimated from the thermodynamic properties of the refrigerant using standard refrigeration
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`cycle analysis techniques; see for example, Fi.C. Downing, FLUOROCARBON
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`5
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`REFRIGERANTS HANDBOOK, Chapter 3, Prentice-Hall, 1988. The coefficient of
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`performance (COP) is a universally accepted measure, especially useful in representing the
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`relative thermodynamic efficiency of a refrigerant in a specific heating or cooling cycle
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`involving evaporation or condensation of the refrigerant.
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`ln refrigeration engineering, this
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`term expresses the ratio of useful refrigeration to the energy applied by the compressor in
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`compressing the vapor. The capacity of a refrigerant represents the volumetric efficiency of
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`the refrigerant. To a compressor engineer, this value expresses the capability of a
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`compressor to pump quantities of heat for a given volumetric flow rate of refrigerant.
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`In
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`other words, given a specific compressor, a refrigerant with a higher capacity will deliver
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`more cooling or heating power.
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`We have performed this type of calculation for a refrigeration /air conditioning cycle
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`where the condenser temperature is typically 150°F and the evaporator temperature is
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`typically —35°F. We have further assumed isentropic compression and a compressor inlet
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`temperature of 45°F. Such calculations were performed for various combinations of HFO-
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`20
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`1225 and HFC-152a and HFO—12-43. Tables II and Ill below list the COP and capacity of the
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`various blends over a range of condenser and evaporator temperatures.
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`TABLE II
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`CAPACITY
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`DISCHARGE
`TEMPERATURE
`(°F)
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`COMPOSTION
`HFO—1225/
`HFC-152a
`(BY WEIGHT)
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`252
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`10
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`Patent
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`Att<;rney Docket No. H0O4:;69 (4510)
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`TABLE III
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`CAPACITY
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`%
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`DISCHARGE
`TEMPERATURE
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`COMPOSTION
`HFO-1225/
`HFO—1243
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`;
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`(BY WEIGHT)
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`Patent
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`Attvcrneiy oc et bio.
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`03469 (4510)
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`WHAT IS CLAIMED IS:
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`1.
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`An azeotrope or azeotrope-like composition consisting essentially of from about
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`5
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`1 to about 90 weight percent HFC—152a and from about 99 to about 10 weight percent HFO—
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`1225, which compositions have a boiling point of -24 °C : 2 at 14.61 psia.
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`2. An azeotrope or azeotrope-like composition consisting essentially of from about 1
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`to about 20 weight percent HFO—1243 and from about 99 to about 80 weight percent HFO—
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`10
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`1225, which compositions have a boiling point of -25 °C 4.» 3 at 14.61 psia.
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`Patent
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`731.3;
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`Attortney Docket No. HO04fi2169 (4510)
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`Abstract of the Invention
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`Azeotrope and azeotrope—|ike compositions comprising constant-boiling mixtures of
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`5
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`1,1 ,3,3,3—pentaf|uoropropene (HFO~1225) and 1,1-difluoroethane (HFC—152a) and/or 3,3,3-
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`trifluoropropene (HFO—1243). The mixtures are useful as refrigerants for heating and cooling
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`and as blowing agents, aerosol propellants and fire extinguishing and suppressing agents.
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