摘要:
An acrylic elastomer capable of giving a vulcanization product having a distinguished tensile strength and a good stretching even by cross-linking with an organic peroxide can be obtained by using an organic peroxide having a non-conjugated double bond as a polymerization initiator in polymerization of at least one of (a) alkyl acrylates having an alkyl group of 1 to 8 carbon atoms and (b) alkoxyalkyl acrylates having an alkoxylalkyl group of 2 to 8 carbon atoms.
摘要:
An acrylic elastomer capable of giving a vulcanization product having a distinguished tensile strength and a good stretching even by cross-linking with an organic peroxide can be obtained by using an organic peroxide having a non-conjugated double bond as a polymerization initiator in polymerization of at least one of (a) alkyl acrylates having an alkyl group of 1 to 8 carbon atoms and (b) alkoxyalkyl acrylates having an alkoxyalkyl grouop of 2 to 8 carbon atoms.
摘要:
A fluorine-containing-copolymer composition comprises a novel terpolymer of tetrafluoroethylene-perfluoro (methylvinylether)-1,1,3,3,3-pentafluoropropene and dialkali metal salt of bisphenol compound gives a vulcanization product having a low compression set.
摘要:
By using salicylaldoimino copper complex having the following formula as a cross-linking agent for a fluorine-containing elastomer containing at least one of iodine and bromine in the molecule, a vulcanization product with an improved heat resistance can be obtained and generation of harmful substances such as methyl iodine, methyl bromine, etc. can be made less at the cross-linking: ##STR1##
摘要:
Novel compound, 2,2-bis(4-carboxyphenyl)hexafluoropropane bisamidrazone, obtained by conversion of the carboxy groups of 2,2-bis(4-carboxyphenyl)hexafluoropropane to acid chloride groups, followed by reaction with ammonia; dehydration reaction of the resulting 2,2-bis(4-carboxyphenyl)hexafluoropropane diamide; reaction of the thus obtained 2,2-bis(4-cyanophenyl)hexafluoropropane with alcohol; and reaction of the resulting 2,2-bis(4-carboxyphenyl)hexafluoropropane bisiminoalkyl ether with hydrazine is a useful vulcanizing agent for fluorine-containing elastomer having cyano group.
摘要:
A fluorine-containing elastomer comprising vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene having a high fluorine content (e.g. at least 68% by weight) can be vulcanized with a polyol-based cross-linking agent by further copolymerizing 2H-pentafluoropropylene into the elastomer, whereby the resulting vulcanization products having improved characteristics such as rheological properties, normal state physical properties and compression set can be obtained. Vulcanization products obtained by vulcanization with a polyol-based cross-linking agent and a quaternary onium salt compound have a good permeation resistance to fuel oil as a result of a permeation test with a mixed solvent of gasoline/methanol in a volume ratio of 85/15.
摘要:
A fluorine-containing elastomer capable of giving a primary vulcanization product with a good permanent set through peroxide vulcanization is produced by homopolymerization or copolymerization of a fluorine-containing olefin having 2 to 8 carbon atoms in the presence of an iodine and bromine-containing compound represented by the general formula RBrnIm, wherein R represents a fluorohydrocarbon group, a chlorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m each are integers of 1 and 2, and a small amount of perfluoro(vinylether) compound having a general formula of CF.sub.2 .dbd.CFO[CF.sub.2 CF(CF.sub.3)O]m(CF.sub.2)nX, wherein X is a bromine atom or an iodine atom and m and n each are 1, 2 or 3.
摘要:
A fluorine-containing copolymer composition comprises a novel terpolymer of tetrafluoroethylene-perfluoro(methylvinylether)-1,1,3,3,3-pentafluoropropene and dialkali metal salt of bisphenol compound gives a vulcanization product having a low compression set.
摘要:
A fluorine-containing elastomer composition, which comprises a terpolymer of tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and cyano group-containing (perfluorovinylether) represented by the following general formula: CF.sub.2 .dbd.CF�OCF.sub.2 CF(CF.sub.3)!nCN wherein n is an integer of 1 to 5, and a bis(aminophenyl) compound represented by the following general formula as a cross-linking agent: ##STR1## , wherein A is, for example, an alkylidene group, and X and Y are a hydroxyl group or an amino group, can produce vulcanized products having a good heat resistance and good physical properties, and the bis(aminophenyl) compound has no problem as to its safety.
摘要:
A vulcanizable, fluorine-containing elastomer composition, which comprises a fluorine-containing elastomer containing at least one of iodine and bromine in the molecule, salicylaldo-imino copper complex having the following formula: ##STR1## as a cross-linking agent, and a polyfunctional unsaturated compound as a cross-linking aid can produce vulcanized products having a largely improved modulus of elasticity.