Abstract: A fluoroelastomer composition comprising (1) a fluoroelastomer consisting essentially of tetrafluoroethylene units, perfluoro(alkyl vinyl ether) units and cyano group containing perfluorovinyl ether units; (2) a specified silane coupling agent; (3) a crosslinking agent and (4) an inorganic filler. This fluoroelastomer composition enables improving the moldability of a crosslinkable composition containing an inorganic filler other than carbon black.

Abstract: The polymerization initiator-containing solution obtained by mixing a specific perfluorodicarboxylic acid fluoride (A) with CsF in an aprotic polar solvent with stirring to conduct reaction and thereby form a polymerization initiator (B) and then allowing the reaction solution to stand for not less than 72 hours at a temperature of 0 to 30° C. A polymerization initiator-containing solution comprises a specific polymerization initiator (B′) and an aprotic polar solvent. The process for preparing a perfluoropolyether comprises polymerizing hexafluoropropylene oxide in the presence of the polymerization initiator-containing solution.

Abstract: A motor-driven compressor includes a motor and a compression portion for compressing a refrigerant. The motor-driven compressor comprises an input terminal for the motor and a drive circuit for controlling a rotation speed of the motor. The input terminal of the motor passes through an opening formed through a wall of a refrigerant suction route, whereby the input terminal is secured to the wall, and extends beyond the wall. The drive circuit controls the rotation speed of the motor and has an output connector. The output connector of the drive circuit is connected directly to the input terminal to secure the drive circuit to the wall. The direct connection eliminates a need for a wire connection between the output connector and the input terminal. Moreover, methods of assembling motor-driven compressors are disclosed.

Abstract: Monoester monoacid fluoride of dicarboxylic acid is produced by allowing dicaroxylic acid fluoride represented by the following general formula: FOCCF(CF3)OCF2(A)p(CF2)qCOF where A is a bifunctional perfluorinated group having 1 to 10 carbon atoms; p is 0 or 1; and q is 0 or an integer of 1-10, to react with an alcohol having at least 3 carbon atoms, thereby esterifying the terminal CF2COF group. Such selective monoesterification reaction is effective for separation and purification of a dicarboxylic acid difluoride isomer mixture comprising symmetrical dicarboxylic acid difluoride and asymmetrical dicarboxylic acid difluoride.

Abstract: A motor-driven compressor is formed integrally with a compressor device for compressing refrigerant and a motor for driving the compressor device. The motor-driven compressor includes a drive circuit and a plurality of cooling fins. The drive circuit controls the operation of the motor. The drive circuit is provided on an outer surface of a wall of a refrigerant suction route. The plurality of cooling fins are formed on an inner surface of the wall of the refrigerant suction route. In such motor-driven compressors, the drive circuit may be sufficiently cooled without using cooling devices. As a result, providing cooling devices with the drive circuit in motor-driven compressors is no longer necessary.

Abstract: A scroll-type compressor includes a fixed scroll and an orbiting scroll each having an end plate and a spiral element. Each of the spiral elements interfits and form at least one pair of sealed-off fluid pockets. The fixed scroll is connected to a front housing. A driving mechanism includes a drive shaft rotatably supported by the front housing. A first and a second pin hole for aligning of the fixed scroll and the orbiting scroll are formed in an end surface of the spiral element of the fixed scroll and in an end surface of the front housing, respectively, and the first pin hole formed in the fixed scroll and the second pin hole formed in the front housing have different diameters. The configuration of the scroll-type fluid compressor according to this invention may be finely adjusted to align the fixed scroll and the orbiting scroll.

Abstract: A fluoroelastomer obtained by polymerizing (a) tetrafluoroethylene, (b) a perfluoro (alkyl vinyl) ether and (c) a cyano group containing perfluorovinyl ether, in the presence of a brominated compound represented by the general formula:

Abstract: The polymerization initiator-containing solution of the first invention is obtained by mixing a specific perfluorodicarboxylic acid fluoride (A) with CsF in an aprotic polar solvent with stirring to conduct reaction and thereby form a polymerization initiator (B) and then allowing the reaction solution to stand for not less than 72 hours at a temperature of 0 to 30° C. The polymerization initiator-containing solution of the second invention comprises a specific polymerization initiator (B′) and an aprotic polar solvent. The process for preparing a perfluoropolyether according to the invention comprises polymerizing hexafluoropropylene oxide in the presence of the polymerization initiator-containing solution.

Abstract: Disclosed is a fluoroelastomer composition comprising (1) a fluoroelastomer which comprises (a) tetrafluoroethylene, (b) a perfluoro(C1-C5 alkyl vinyl ether) and/or a perfluoro(C3-C11 alkoxyalkyl vinyl ether) and (c) a cyano group-containing perfluorovinyl ether, (2) a hydrotalcite compound, (3) a crosslinking agent and (4) titanium dioxide (TiO2). The fluoroelastomer composition is capable of producing a fluoroelastomer molded product having excellent metal corrosion inhibition properties, and particularly, the fluoroelastomer composition is capable of producing a fluoroelastomer molded product which generates only small amount of a corrosive material when exposed to high temperature.

Abstract: Disclosed is a fluoroelastomer composition comprising (1) a fluoroelastomer which comprises tetrafluoroethylene, a perfluoro (C1-C5 alkyl vinyl ether) or a perfluoro (C3-C11 (alkoxyalkyl) vinyl ether) and a cyano group-containing perfluorovinyl ether, (2) a hydrotalcite compound, (3) a crosslinking agent and (4) carbon black. The fluoroelastomer composition has excellent metal corrosion inhibition properties, and particularly, this composition generates only small amount of a corrosive material when exposed to high temperatures.

Abstract: A scroll-type compressor includes a fixed first scroll member, an orbital second scroll member, and a ball coupling provided as a rotation preventing mechanism for the second scroll member. The ball coupling has a pair of plates integrally formed with ring-like ball rolling grooves and a plurality of balls disposed therebetween. The compressor comprises a driven crank mechanism creating a swing motion for producing an orbital movement of the second scroll member. The amount of variation of the swing angle due to the driven crank mechanism is set within a range predetermined in accordance with a diameter of a ring form of each of the ring-like ball rolling grooves. The variation of the orbital radius of the orbital movement of the second scroll member corresponding to the swing angle may be regulated within a most appropriate range, thereby preventing occurrence of problems in the rotation preventing mechanism with respect to abrasion, performance and durability.

Abstract: Fluorine-containing elastomers produced through copolymerization reaction of vinylidene fluoride, tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and chlorotrifluoroethylene in the presence of a bromine-containing monomer compound and an iodine- and bromine-containing compound, where hexafluoropropene can be further copolymerized, have not only a distinguished resistance to amine-based additives and also distinguished low-temperature characteristic and engine oil resistance, and also a lower cost attained by reduced copolymer proportion of perfluoro(lower alkyl vinyl ether).

Abstract: This invention provides a scroll type compressor employing an Oldham coupling producing little vibration or noise and in which components thereof are easy to produce by means of a lathe. The Oldham coupling blocks a rotation of a movable scroll member 4. A direction of a reciprocation of the Oldham coupling 16 coincides with a minor axis of an elliptic circulating orbit of the movable scroll member 4. When a total mass of the movable scroll member 4 and parts circulating elliptically together therewith is ma, a mass of an Oldham ring 16 is mb, a radius of a minor axis of an elliptic circulating orbit is R.sub.Y and a radius of a major axis of the elliptic circulating orbit is R.sub.X, a relation of R.sub.X =(1+mb/ma)R.sub.Y is established.

Abstract: Fluorine-containing elastomers produced through copolymerization reaction of vinylidene fluoride, tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and chlorotrifluoroethylene in the presence of a bromine-containing monomer compound and an iodine- and bromine-containing compound, where hexafluoropropene can be further copolymerized, have not only a distinguished resistance to amine-based additives and also distinguished low-temperature characteristic and engine oil resistance, and also a lower cost attained by reduced copolymer proportion of perfluoro(lower alkyl vinyl ether).

Abstract: A bisphenol compound represented by the following general formula: ##STR1## where R is an alkylene group having 1 to 5 carbon atoms, an alkylidene group having 1 to 5 carbon atoms, a perfluoroalkylene group having 1 to 5 carbon atoms, a perfluoroalkylidene group having 1 to 5 carbon atoms, a SO.sub.2 group or an O group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different alkyl groups, alkenyl groups, aryl groups, alkylaryl groups or aralkyl groups, each having 1 to 25 carbon atoms, can give vulcanization products having a good resistance to hot water, when used as a cross-linking agent for terpolymers of tetrafluoroethylene/perfluoro (alkyl vinyl ether)/ethylenically unsaturated cure site monomer.

Abstract: 2.2'-bis(3-mercaptophenyl)hexafluoropropane [bisthio-phenol AF] is obtained in good yield by chlorosulfonating 2.2'-bisphenylhexafluoropropane and reducing the thus quantitatively obtained 2,2'-bis(3-chlorosulfonylphenyl)-hexafluoropropane with zinc under acidic conditions and is effectively used as a cross-linking agent for a fluorine-containing elastomer having halogenophenyl groups as cross-linkable groups.

Abstract: The disclosure describes plastic formed products comprising:one selected from the group consisting of a thermoplastic resin and a thermosetting resin; and0.1 to 10 wt % of at least one selected from the group consisting of ferric oxide hydroxide particles, hematite particles, magnetite particles and maghemite particles;wherein (1) the average major axial diameter or the plate diameter of said ferric oxide hydroxide particles is 0.02 or 2.0 .mu.m and the average aspect ratio or the plate ratio thereof is 2 to 20, (2) the average particle size of said hematite particles, magnetite particles and maghemite particles is 0.01 to 1.0, the BET specific surface area thereof is 1 to 120 m.sup.2 /g and the water content on the surfaces thereof is not less than 0.02 wt %/m.sup.2 /g.

Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by the following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.

Abstract: A novel fluorine-containing copolymer elastomer having bromine groups as cross-linkable groups, which comprises about 45 to about 80% by mole of tetrafluoroethylene, about 50 to about 20% by mole of a perfluoro(vinylether) represented by following general formula:CF.sub.2 .dbd.CFO(CF.sub.2).sub.2 (OCF.sub.2)nOCF.sub.3where n is an integer of 1 to 5, and about 0.2 to about 5% by mole of a bromine-containing unsaturated monomer compound, sum total being 100% by mole, gives vulcanization products having distinguished resistances to chemicals, low temperature and heat.