Abstract: The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and heptane. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Abstract: Fluoroether diketones are provided that can be useful in apparatuses that includes a device and a mechanism for transferring heat. The provided fluoroether diketones are stable at temperatures above 175° C., are environmentally friendly, and are economical to produce. The provided apparatuses can be useful for vapor phase soldering of electronic devices.

Abstract: An aerosol electrical contact cleaning and lubricating compound formulation including a first solvent, a second solvent, a third solvent, a lubricant, and a propellant. The first solvent is a mixture of methyl nanofluoroisobutyl ether and methyl nanofluorobutyl ether. The second solvent is a dichloroethylene, while the third solvent is an alkyl cyclohexane. The lubricant is perfluropolyether oil, and the propellant is a hydrofluorocarbon liquefied gas.

Abstract: The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity or energy efficiency of the refrigeration, air conditioning and heat transfer system.

Abstract: A lubricant for magnetic disks which can form a lubricating layer having a reduced thickness while attaining a high coverage and is excellent in heat resistance and adhesion to a protective layer. The lubricant for magnetic disks comprises a perfluoropolyether compound in which the relationship between the number-average molecular weight and the standardized value of the number of hydroxy groups contained in the molecule satisfies the following: the number-average molecular weight is in the range of 1,000-6,000; the standardized value of the number of hydroxy groups contained in the molecule is 180 or higher; and the compound is in a region located below the line connecting the point where the number-average molecular weight is 1,000 and the standardized value of the number of hydroxy groups in the molecule is 400 to the point where the number-average molecular weight is 6,000 and the standardized value of the number of hydroxy groups in the molecule is 1,600.

Abstract: The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and methanol. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Abstract: The present disclosure provides azeotropic and azeotrope-like compositions comprised of methylperfluoroheptene ethers and 2-propanol. The present disclosure also provides for methods of use for the azeotropic and azeotrope-like compositions.

Abstract: A composition is disclosed which comprises an aryl perfluoropolyether, optionally a halogenated oil, and further optionally a thickening agent. The composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300° C. without decomposition. The halogenated oil can be a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof. The thickening agent can be finely divided silica, boron nitride, clay, soap, poly(tetrafluoroethylene), clay, talc, silica, titanium dioxide, polydimethylsiloxane, polyurea, polyurethane, or combinations of two or more thereof.

Abstract: The present invention provides a grease composition or a lubricating oil composition which is capable of effectively preventing hydrogen brittleness-caused peeling from occurring on a rolling surface of a rolling bearing, is excellent in durability in a high temperature and speed operation, and can be used for a long time. A grease-packed bearing (1) has an inner ring (2), an outer ring (3), and a plurality of rolling elements (4). A sealing member (6) for sealing a grease composition (7) is provided at openings (8a) and (8b) disposed at both axial ends of the inner ring (2) and the outer ring (3). The grease composition (7) includes a base grease composed of a base oil and a thickener and an additive added to the base grease. The additive contains at least one compound selected from among plant-derived polyphenolic compounds and compounds formed by decomposition thereof.

Abstract: Azeotrope-like compositions comprising 1-bromopropane and 1,1,1,2,3,3-hexafluoro-3-methoxy-propane, and uses thereof, are described.

Abstract: A chemical composition of matter comprising a wax plasticizing agent (plasticizer) tributoxyethyl phosphate, a mixture of selected long chain fatty acids (preferably C10 to C22), and a mixture of selected low-surface tension surfactants, which when added in solution to crude oil or refined products has been shown to lower both the B.S. & W. (rag layer) and the coefficient of friction of crude oils and refined products. This chemical composition of matter is particularly useful as a wax liquefaction, dispersant, and solubilization agent for asphaltene and paraffins in crude oil and refined products. The reduction in the co-efficient of friction resulting from the addition of this product to crude oil will allow crude oil to pump through pipelines with a minimum amount of resistance due to friction (drag).

Abstract: In order to obtain a magnetic recording disk that exhibits high reliability even if the flying height of a magnetic head becomes very narrow, a lubricant is specified in terms of both molecular structure and quantitative data. That is, a lubricating layer 14 of the magnetic recording disk 1 is formed by a lubricant which contains perfluoropolyether compounds represented by the following chemical formula (Chemical Formula 1) and which has a first component content of 71.7%, a second component content of 15.7%, a third component content of 11.7%, a fourth component content of 0.3%, and a fifth component content of 0.6%: X—OCH2CF2—(CF2O)m(C2F4O)n—CF2OCH2O—X??(Chemical Formula 1) m, n=9 to 11 first component: X=X1=CH2CH(OH)CH2OH second component: X=X2=CH2CH(OH)CH2OCH2CH(OH)CH2OH third component: X=X3=H fourth component: X=X4=CF3 fifth component: X=X5=CF2Cl.

Abstract: A lubricant according to one embodiment includes a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.

Abstract: A grease composition, which comprises (A) a perfluoropolyether base oil, (B) a thickener, and (C) barium sulfate and/or antimony oxide, where 0.1-50% by weight of the component (B) and 1-25% by weight of the component (C) are contained, has a distinguished effect on improvements of abrasion resistance, friction characteristics, load durability, high-temperature durability and corrosion resistance without any deterioration of heat resistance by adding at least one of barium sulfate and antimony oxide, each having an average primary particle size of 0.1-20 ?m, as component (C).

Abstract: A composition is disclosed which comprises an aryl perfluoropolyether, optionally a halogenated oil, and further optionally a thickening agent. The composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300° C. without decomposition. The halogenated oil can be a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof. The thickening agent can be finely divided silica, boron nitride, clay, soap, poly(tetrafluoroethylene), clay, talc, silica, titanium dioxide, polydimethylsiloxane, polyurea, polyurethane, or combinations of two or more thereof.

Abstract: Polyisobutenylphenol-containing Mannich adducts are prepared by a) alkylation of a phenol with highly reactive polyisobutene having a number average molecular weight of less than 1000 and a polydispersity of less than 3.0, at below about 50° C. in the presence of an alkylation catalyst; b) reaction of the reaction product from a) with b1) an aldehyde chosen from formaldehyde, an oligomer and a polymer of formaldehyde and b2) at least one amine which has at least one primary or one secondary amino function and are used as detergent additives in fuel and lubricant compositions, and additive concentrates, fuel compositions and lubricant compositions contain these Mannich adducts.

Abstract: The present invention provides a lubricant for forming a lubricating layer which is useful in preventing fly and stiction and/or corrosion at an extremely small flying height of 10 nm or less, which is prevented from migrating at a high rotational speed of 5400 rpm or more, which has high adhesion, and which is suitable for a load/unload method. A crude lubricant containing at least one perfluoropolyether is degassed and then purified. Alternatively, a liquid crude lubricant containing at least one perfluoropolyether is purified by vaporizing the crude lubricant and then liquefying the vapor of the perfluoropolyether within a distance less than the mean free path of molecules of the perfluoropolyether. A magnetic disk is prepared in such a manner that a carbonaceous protective layer is formed above a substrate and a lubricating layer is formed on the protective layer using of the lubricant. The lubricant contains the perfluoropolyether and has a molecular weight distribution of 1.3 or less.

Abstract: A composite lubricant for recording disk media, a recording disk media including a layer of the composite lubricant, and method of manufacturing the same are described. The composite lubricant may include a non-phosphazene component and a phosphazene component where the non-phosphazene component is a difunctional perfluoropolyether compound terminated with first and second polar end groups, the first polar end group comprising a first number of hydroxyls and the second polar end includes a second number of hydroxyls, greater than the first number of hydroxyls. The phosphazene component may be a difunctional perfluoropolyether compound terminated with a phosphazene functional group and with a third polar end group, the third polar end group comprising a third number of hydroxyls equal to the second number of hydroxyls.

Abstract: Hydrofluoro alcohols of formula (I): A—(Rf)a—CFX—O—RhO—(CFX—(Rf)a*—CFX—O—RhO—)nH in which: Rh is a hydrocarbon-based chain; X is F or a C1-C6 (per)fluoroalkyl; a or a* is 0 or 1; Rf is a (per)fluoro(poly)oxyalkylene chain or a (per)fluoroalkyl chain; A is selected from the group consisting of —F, —Cl, and —H (possible only when a=1) or is HO—Rh—O—CFX—; n is an integer from 0 to 200, with the condition that n=0 when A is selected from the group consisting of —F, —Cl, and —H.

Abstract: Provided is a lubricant solution for a magnetic recording media, wherein the lubricant solution includes a lubricant that is excellent in chemical stability and capable of imparting excellent lubricity to the lubricant solution, and a solvent having a suitable dissolving power for the lubricant, being excellent in drying properties and not influential over the ozone layer. Also provided is a lubricant solution including a lubricant and a fluorinated alkyl ether. Further provided is a lubricant solution including a compound of the formula (HO—CH2—CF2(OCF2CF2)dO—)3Y, wherein Y is a trivalent perfluorohydrocarbon group, as the lubricant and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether as the fluorinated alkyl ether.

Abstract: Compositions are provided that include blends that consist essentially of 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane, trans-1,2-dichloroethylene, and a third component. The third component is selected from methanol, ethanol, isopropanol, t-butanol, and 1-propanol. The blends form ternary azeotropes. Provided compositions can be useful for cleaning electronic parts, as coating solvent components, as heat transfer fluids, and as lubricants.

Abstract: A composition of compressor working fluid including a dissolved gas or a condensate from a dissolved gas, and a base fluid including at least a first base stock and a second base stock, wherein the viscosity difference between the first base stock and the second base stock is greater than 125 cSt, Kv 100° C. A composition of compressor working fluid including a dissolved gas or a condensate from a dissolved gas, and a base fluid including a first base stock and a second base stock, wherein the viscosity difference between the first and second base stock is greater than 40 cSt, Kv 100° C., and wherein the first and second base stocks are each polyglycol or polyalkylene glycol base derived from propylene oxide. A method of achieving favorable viscosity index for a compressor working fluid. A method of reducing dilution from gas being compressed for a compressor working fluid.

Abstract: A composition is disclosed which comprises an aryl perfluoropolyether, optionally a halogenated oil, and further optionally a thickening agent. The composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300° C. without decomposition. The halogenated oil can be a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof. The thickening agent can be finely divided silica, boron nitride, clay, soap, poly(tetrafluoroethylene), clay, talc, silica, titanium dioxide, polydimethylsiloxane, polyurea, polyurethane, or combinations of two or more thereof.

Abstract: A composition is disclosed which comprises an aryl perfluoropolyether, optionally a halogenated oil, and further optionally a thickening agent. The composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300° C. without decomposition. The halogenated oil can be a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof. The thickening agent can be finely divided silica, boron nitride, clay, soap, poly(tetrafluoroethylene), clay, talc, silica, titanium dioxide, polydimethylsiloxane, polyurea, polyurethane, or combinations of two or more thereof.

Abstract: A composition is disclosed which comprises an aryl perfluoropolyether, optionally a halogenated oil, and further optionally a thickening agent. The composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300° C. without decomposition. The halogenated oil can be a perfluoropolyether, a fluorosilicone, a polytrifluorochloroethylene, or combinations of two or more thereof. The thickening agent can be finely divided silica, boron nitride, clay, soap, poly(tetrafluoroethylene), clay, talc, silica, titanium dioxide, polydimethylsiloxane, polyurea, polyurethane, or combinations of two or more thereof.

Abstract: A lubricant containing a compound (A) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a polar group at each of opposite terminals thereof, and a compound (B) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a nonpolar group at least one terminal thereof —(CF2CF2CF2O)a-??(1) wherein a is a real number of 5 to 30.

Abstract: An ether composition and a lubricant which bond to substrates with a high bonding ratio and form a coating having a low friction coefficient surface are provided. An ether composition comprising at least two compounds selected from (X—)3Y3, (X—)2Y3—Z and X—Y3(—Z)2 wherein the total number of moles of CF3 groups in Z in relation to the sum of the total number of moles of CF3 groups in Z and the total number of moles of OH groups in X is at least 0.001 and at most 0.30. X is HO—(CH2CH2O)a.(CH2CH(OH)CH2O)b-Q-, Y3 is a perfluoroalkane-triyl group, and Z is CF3(CF2)sO(CF2CF2O)g—, wherein a is an integer of from 0 to 100, b is 0 or 1, s is an integer of from 0 to 19, g is an integer of from 3 to 200, and Q is a polyfluorinated polymethylene group or a polyfluorinated polymethylene group having an etheric oxygen atom bonded between carbon-carbon atoms and/or an etheric oxygen atom bonded to the terminal carbon atom bonded to Y3.

Abstract: To provide an ether composition having a high fixative to a substrate, which has a low surface friction coefficient when formed into a coating film, and a lubricant. An ether composition comprising at least two ether compounds (A) each of which has from 1 to 4 groups represented by the following formula (X) and from 0 to 3 groups represented by the following formula (Z), with the total of the groups represented by the formula (X) and the groups represented by the formula (Z) being 4: HO—(CH2CH2O)a.(CH2CH(OH)CH2O)b-Q-??(X), CF3(CF2)sO(CF2CF2O)g—??(Z), provided that in the above formulae (X) and (Z), a is an integer of from 0 to 100, b is 0 or 1, s is an integer of from 0 to 19, g is an integer of from 3 to 200, and Q is a polyfluorinated polymethylene group or a polyfluorinated polymethylene group having an etheric oxygen atom.

Abstract: Use as additive to stabilize perfluoropolyether lubricant oils at high temperatures, preferably higher than 200° C., of a solid polymer at room temperature, having a softening or a melting point higher than 150° C., preferably higher than 200° C., and containing in the repeating unit at least one aromatic ring; preferably in the backbone, and lubricating compositions containing said additive.

Abstract: Azeotrope-like compositions comprising 1-bromopropane and 1,1,1,2,3,3-hexafluoro-3-methoxy-propane, and uses thereof, are described.

Abstract: Azeotrope-like compositions comprising 1-methoxy-2-propanol and a hydrofluoroether, and uses thereof, are described.

Abstract: The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity, or energy efficiency of a refrigeration, air conditioning or heat transfer system.

Abstract: The invention relates to compounds comprising an aryl sulfonate group, a spacer and a Y group, wherein Y represents CF3—(CH2)a—O—, SF5—, CF3—(CH2)a—S—, CF3CF2S—, [CF3—(CH2)a]2N— or [CF3—(CH2)a]NH—, a represents a whole number selected from the range of 0 to 5 or (formula I), Rf represents CF3—(CH2)r—, CF3—(CH2)r—O—, CF3—(CH2)r—S—, CF3CF2—S—, SF5—(CH2)r— or [CF3—(CH2)r]2N—, [CF3—(CH2)r]NH— or (CF3)2N—(CH2)r—, B represents a simple bond, O, NH, NR, CH2, C(O)—O, C(O), S, CH2—O, O—C(O), N—C(O)1C(O)—N, O—C(O)—N, N—C(O)—N, O—SO2 or SO2—O, R represents alkyl having 1 to 4 C-atoms, b represents 0 or 1 and c represents 0 or 1, q represents 0 or 1, at least one radical from b and q represents 1, and r represents 0, 1, 2, 3, 4 or 5. The invention also relates to a method for the production of said compounds and to the uses of said surface-active compounds.

Abstract: Fluorinated lubricants of formula: T-O[A-B]z-[A-B?]z?-A-T? (I) wherein: A=—(X)a—O-A?-(X?)b wherein A? is a perfluoropolyether chain comprising units (CF2O), (CF2CF2O), (CF2CF2CF2O), (CF2CF2CF2CF2O); X, X??—CF2—, —CF2CF2—; a, b=0 or 1; B derives from olefins, of which at least one homopolymerizable by radical route, of formula: —[(CR1R2—CR3R4)j(CR5R6—CR7R8)j?]— (Ia) wherein j=1-5, j?=0-4 and 2<(j+j?)<5; R1-R8=halogen, H, C1-C6 (per)haloalkyl, C1-C6 alkyl, C1-C6 oxy(per)-fluoroalkyl; z?2; z? is 0 or an integer; z, z? are such that the number average molecular weight of the polymer of formula (I) is in the range 500-500,000; B?=(Ia) but at least one of R1-R8 has a meaning different than that in B and 2?(j+j?)<5; T, T?=C1-C3 perfluoroalkyl, C1-C6 alkyl and compositions thereof.

Abstract: Polymers of formula Q-O-[A-B]z-[A-B?]z-A-Q???(I) wherein: A=-(X)a—O-A?-(X?)b— with A?=perfluoropolyether chain and X, X?=—CF2—, —CF2CF2—; a, b=0.1 with the proviso that a=1 if A is linked to Q-O—; b=0 when A is linked to Q?; B derives from homopolymerizable olefins by radical route, of formula: —[(CR1R2—CR3R4)j(CR5R6—CR7R8)j?]—??(Ia) wherein j is an integer from 1 to 30, j? is an integer from 0 to 29 with the proviso that (j+j?) is higher than 2 and lower than 30; R1-R8 are halogen; H; C1-C6 (per)haloalkyl; C1-C6 alkyl; or C1-C6 oxy(per)fluoroalkyl; B?=B but at least one among R1-R8 has a meaning different from that in B; z, z? are such that the number average molecular weight of the polymer of formula (I) is between 500 and 150,000; Q, Q?=C1-C3 (per)fluoroalkyl or functional end group —(CFW)-Dq-Tk; W=F, CF3; k and q are integers, k ranges from 1 to 4, q is an integer and is equal to 0 or 1; with the proviso that at least one of Q, Q? is functional end group.

Abstract: The present invention provides a lubricant for recording media that does not readily decompose, and which has high adhesion to recording media, and a magnetic disk that is durable against continuous sliding under high-speed rotation. The present invention provides a lubricant for recording media containing: a perfluoropolyether compound represented by Formula (1), R1—CH2CF2O—(CF2CF2O)m—(CF2O)n—CF2CH2—R2??(1) wherein R1 represents R represents a C1-4 haloalkyl group, R2 represents —OCH2CH(OH)CH2OH, and m and n are each independently 1-30; and another perfluoropolyether compound represented by Formula (2), R1—CH2CF2O—(CF2CF2O)m—(CF2O)n—CF2CH2—R3??(2) wherein R1, m and n are as defined above and R3 represents —OCH2CH(OH)CH2OCH2CH(OH)CH2OH. The present invention also provides a magnetic disk having a lubricating layer essentially consists of such a lubricant.

Abstract: The present invention provides lubricating grease which is excellent in durability at a high temperature, restrains a reaction from occurring between fluorine and steel, and has a long life; and a rolling bearing in which the lubricating grease is enclosed. The lubricating grease contains perfluoropolyether oil as a base oil thereof and fluorocarbon resin powder as a thickener thereof. The lubricating grease further contains an additive containing a substance capable of forming a film on a metal surface. The substance is a diurea compound having an —NH— bond in a molecular structure thereof, an organic-acid metal salt such as sodium sebacate, molybdate such as potassium molybdate or sodium molybdate, or a bismuth-containing compound such as bismuth sulfate. The rolling bearing has an inner ring and an outer ring disposed concentrically with each other, a plurality of rolling elements interposed between the inner ring and the outer ring, and a retainer dividedly holding the rolling elements.

Abstract: There are provided a composition that exhibits sufficient flowability and also displays high substrate adhesion, and a magnetic recording medium, a head slider and a magnetic recording device that use this composition as a lubricant and are thus not prone to faults. The composition comprises a fluorine-containing polyether represented by formula (1), (in formula (1), p and q represent, independently of the symbols in other formulae, any chosen integers). The composition can be produced by reacting a polymer represented by formula (2) with glycidol, HOCH2CF2O(CF2CF2O)p(CF2O)qCF2CH2OH??(2) (in formula (2), p and q represent, independently of the symbols in other formulae, any chosen integers).

Abstract: A lubricant composition is provided comprising a first liquid lubricant and a second liquid lubricant, wherein the first liquid lubricant contains a cyclotriphosphazene ring attached to at least one perfluoropolyether having a single terminal hydroxyl group, and the second liquid lubricant contains a perfluoropolyether having two end groups selected from hydroxyl, tertiary amine, and combinations thereof. A magnetic recording media is also provided, comprising a substrate, a magnetic layer, an overcoat layer and a lubricant layer thereon, wherein the lubricant layer is formed from the lubricant composition. A further aspect of the invention concerns a method of making a magnetic recording media comprising forming a magnetic layer on a substrate; forming a protective overcoat layer on the magnetic layer; and forming a lubricant layer on the surface of the overcoat layer by applying the lubricant composition to the surface of the overcoat layer.

Abstract: Azeotrope-like compositions comprising 1-methoxy-2-propanol and a hydrofluoroether, and uses thereof, are described.

Abstract: A grease composition comprising at least one polymer having a mesogen structure in the principal chain or in the side chain(s) thereof, and at least one viscous agent is disclosed. A viscous agent which is a discotic compound having, in the molecule thereof, a discotic core and three or more side chain groups radially extended from said discotic core is also disclosed. The discotic core and/or said side chain groups has at least one tautomeric group therein, and at least one side chain group of said three or more side chains has, at the end portion thereof, a long chain group in which 20 or more atoms selected from the group consisting of oxygen, carbon, nitrogen, silicon and sulfur atoms are linked in a straight-chain-like manner or in a branched manner.

Abstract: Liquid hydrofluorocarbons provide low corrosivity lubrication of metallic surfaces especially at elevated temperatures.

Abstract: Lubricant with non-terminal functional groups. The location of the functional groups minimizes free chain length and molecular weight of a lubricant while simultaneously maximizing evaporation temperature. The locations of the functional groups to the backbone of the molecule of the lubricant allows for shorter lengths of free backbone length between functional groups attached to a lubricated surface. The lubricant lubricates mechanical devices including hard disk drives. The lubricant can also be added to media or other mechanical parts in conjunction with other lubricants.

Abstract: A rolling bearing holding two or more rolling elements 13 between inner ring 10 and outer ring 11 in such a way that these rolling elements can freely roll, and packed with a grease is described, wherein the grease is a mixture of at least one of metal complex soap-based grease and urea-based grease, each incorporated with 8 to 35% by mass of thickening agent, and fluorine-based grease comprising perfluoropolyether oil as a base oil incorporated with 15 to 42.5% by mass of polytetrafluoroethylene as a thickening agent, ratio of said at least one of the metal complex soap-based grease and urea-based grease versus said fluorine-based grease being 40 to 80:60 to 20 by mass, and total content of the thickening agents being 20 to 30% by mass.

Abstract: A lubricant in the form of lubricating oil or grease, for use in contact with graphite or molybdenum disulfide or in contact with aluminum materials, which comprises a perfluoropolyether oil free from (CF2O)n groups as a repeat unit of polymer and having a kinetic viscosity at 40° C. of 50-1,500 mm2/sec., as a base oil, where F(CF2CF2CF2O)mC2F5 or RfO[CF(CF3)CF2O]p(CF2CF2O)qRf? s used as the perfluoropolyether base oil. The lubricant undergoes no considerable deterioration of high-temperature characteristics (high-temperature durability), even if used in various uses as mentioned above, and also has distinguished low-temperature characteristics when the base oil has a kinetic viscosity of 50-250 mm2/sec.

Abstract: Thermally formed thermoplastic articles can be protected from stress cracking in the presence of stress cracking promoting compounds by forming a shaped article comprising a thermoplastic and a liquid hydrocarbon oil composition. We have found that the liquid hydrocarbon oil composition prevents the stress cracking promoting materials from interacting with the polymeric structure of the stressed container to prevent or inhibit stress cracking in such materials. The methods and compositions of the invention are particularly useful in preventing stress cracking in polyethylene terephthalate beverage containers during bottling operations during which the bottle is contacted with aqueous and non-aqueous materials such as cleaners and lubricants that can interact with the polyester to cause stress cracking particularly in the container base.

Abstract: A fluorochemical ketone compound consists of two terminal, branched, independently fluoroalkylcarbonyl or perfluoroalkylcarbonyl groups and an intervening linear perfluoropolyether segment, each of the terminal groups optionally comprising at least one catenated heteroatom, and the perfluoropolyether segment consisting essentially of at least one tetrafluoroethyleneoxy moiety and, optionally, at least one difluoromethyleneoxy moiety, the moieties being randomly or non-randomly distributed within the perfluoropolyether segment.

Abstract: The rolling bearing of the invention to be incorporated in the compressor for fuel cell system comprises a fluorine-based grease containing a fluororesin and a fluorine-based oil, a urea grease containing a urea compound and a synthetic oil or a lithium complex grease containing a lithium complex and a synthetic oil encapsulated therein. In this arrangement, the grease deterioration of the rolling bearing incorporated in the compressor for force-feeding various fluids between machines can be prevented, making it possible to provide a fuel cell system which can maintain stable operation over an extended period of time.

Abstract: A lubricant is provided that achieves a sufficiently small one-molecule-layer film thickness even when it has a high molecular weight, and has an increased reliability in a wide temperature range environment without losing the flying stability, by making the film thickness of a lubricant layer very small when it is used for the magnetic recording medium lubricant layer and/or head slider lubricant layer of a magnetic recording device. This lubricant comprises a fluorine-containing polymer, the lubricant having a relationship: Y<?1.4475X+2.815, wherein Y is a natural logarithm of diffusion coefficient at 23° C. (unit:?m2/s); and X is a viscosity at 20° C. (unit: Pas), or it comprises a fluorine-containing polymer having a particular structure, and with molecular chains between adjacent polar groups that have a number-average molecular weight of not less than 500.

Abstract: Methods of improving the solubility of highly functionalized polar perfluorinated polyethers in fluorinated solvents are described. In preferred embodiments, the ratio of solubilizer to fluorinated solvent is the azeotropic ratio. The solubilizer can be an alcohol or cyclic ether. The methods finds utility in hard disc drive applications, where perfluorinated polyethers are used as lubricants. Compositions are also provided.