摘要:
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.
摘要:
A fluorinated oligomer having COOH groups at both end and a &rgr;50° value of 1,000 to 10,000 is produced by swelling a fluorine rubber crosslinking product in an organic solvent, followed by decomposition in the presence of a base and a peroxide. The obtained fluorinated oligomer is soluble in solvent and thus easy to separate from fillers, etc., and can be effectively used as a chain-elongating agent for epoxy resin, isocyanate resin, oxazoline resin, etc.
摘要:
A fluorine-containing copolymer having a solvent resistance and a cold resistance is produced by subjecting vinylidene fluoride and at least one of other fluorine-containing monomers to copolymerization reaction in the presence of a polyfluoropolyether having iodo groups at both terminals, represented by the following formula:I(R)pCF(CF.sub.3)O[CF.sub.2 CF(CF.sub.3)O]mRf[OCF(CF.sub.3)CF.sub.2 ]nOCF(CF.sub.3)(R)pIwherein Rf: perfluoroalkylene group of C.sub.2 -C.sub.6 ; R: alkylene group or polyfluoroalkylene group of C.sub.2 -C.sub.8 ; these alkylene groups may contain an ether bond or may be an alkyleneamide-containing or phenylene diamide-containing group; m+n: 20 or more; and p: 0 or 1. The copolymerization reaction is carried out preferably in the presence of a bromine-containing or iodine-containing monomer compound.
摘要翻译:具有耐溶剂性和耐寒性的含氟共聚物通过在具有两端具有碘基的多氟聚醚的存在下,将下列式(1)表示的偏二氟乙烯和其它含氟单体中的至少一种进行共聚反应来制造: :C(CF 3)O] m R f [OCF(CF 3)CF 2] n OCF(CF 3)(R)p I其中R 1表示C 1 -C 6的全氟亚烷基; R:C2-C8的亚烷基或多氟亚烷基; 这些亚烷基可以含有醚键,也可以是含有亚烷基酰胺或亚苯基二酰胺的基团。 m + n:20以上; 和p:0或1.共聚反应优选在含溴或含碘单体化合物的存在下进行。
摘要:
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).
摘要:
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).
摘要:
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.
摘要:
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.
摘要:
A peroxide-vulcanizable fluorine-containing elastomer containing iodines as cross-linking sites, capable of producing vulcanization products having a distinguished heat resistance is produced by polymerization reaction of a fluorinated olefin having 2 to 8 carbon atoms in the presence of a diiodide compound represented by the following general formula:I--R--where R is a divalent fluorohydrocarbon group, chlorofluorohydrocarbon group or hydrocarbon group, having 2 to 8 carbon atoms, respectively, and 2,2-difluoroiodoethylene.
摘要:
2,2 bis(3-mercaptophenyl)hexafluoropropane �bisthiophenol 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.
摘要:
A perfluoro unsaturated nitrile compound represented by the following general formula: CF.sub.2 .dbd.CFO(CF.sub.2)nOCF(CF.sub.3)CN is produced by reaction of chlorine or bromine to a perfluoro unsaturated carboxylic acid ester represented by the following general formula: CF.sub.2 .dbd.CFO(CF.sub.2)nOCF(CF.sub.3)COOR followed by reaction with ammonia, thereby converting the ester group to an acid amide group, and then conducting a dehydration reaction and a dehalogenation reaction of the resulting perfluoro unsaturated carboxylic acid amide represented by the following general formula: CF.sub.2 .dbd.CFO(CF.sub.2)nOCF(CF.sub.3)CONH.sub.2 in any desired sequence, and is effectively applied as a cross-linking site monomer for fluorine-containing elastomers.