摘要:
A copolymer comprising an alkyl acrylate and an unsaturated ester compound represented by the following general formula: CH 2 =CRCOO(CH 2 )nPhOR', (1) CH 2 =CRCOO(CH 2 )nOCO(CH 2 )mPhOR', (2) CH 2 =CHOCO(CH 2 )nOCO(CH 2 )mPhOR', (3) CH 2 =CHO(CH 2 )nOCO(CH 2 )mPhOR' or (4) CH 2 =CHPh(CH 2 )nOCO(CH 2 )mPhOR' (5) where R is a hydrogen atom or a methyl group; R' is a hydrogen atom, an acyl group or a trialkylsilyl group; and Ph is a phenylene group, forms a blend rubber having a good heat resistance and a good amine resistance with a fluorine-containing elastomer.
摘要:
Methanol extract of Maytenus ilicifolia , powder obtained as an aqueous layer component and oily substance obtained a chloroform layer component by intersolvent distribution of a methanol extract between chloroform and water, chromatographic eluate fractions by polystyrene-based resin of the powder obtained as the aqueous layer component, n-hexane insoluble substance obtained from the oily substance as the chloroform layer component, and friedelan-3-β-ol contained therein have a distinguished anti-ulcerative effect on gastric mucosa lesions caused by ethanol.
摘要:
A fluorine-containing elastomer composition comprising a fluorine-containing elastomer having a cyano group as a cross-linking agent and a bisamidoxime compound represented by the following general formula as a vulcanizing agent: where n is an integer of 1 to 10, gives vulcanization products having a satisfactory compression set without any problem of processability such as roll kneadability, etc. during the kneading or during the vulcanization of the fluorine-containing elastomer having a cyano group as a cross-linkable group.
摘要:
When a novel bisamidoxime compound represented by the following general formula: where R is an alkylidene group having 1 to 6 carbon atoms, or a perfluoroalkylidene group having 1 to 10 carbon atoms, is used as a vulcanizing agent for fluorine-containing elastomers having cyano groups as cross-linkable groups, the resulting vulcanizates having a satisfactory compression set are obtained without any problem of processability such as roll kneadability, etc.
摘要:
A fluorine-containing elastomer composition, which comprises a terpolymer of tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) or perfluoro(lower alkoxy-lower alkyl vinyl ether) and cross-linkable cyano group-containing (perfluorovinylether), and a bis(aminothiophenol) compound represented by the following general formula as a cross-linking agent:
wherein A is an alkylidene group having 1 to 6 carbon atoms, a perfluoroalkylidene group having 1 to 10 carbon atoms, a SO₂ group, an O atom, a CO group or a carbon-carbon bond capable of directly bonding two benzene rings and one of X and Y is an amino group, while the other is a mercapto group, can produce cross-linked fluororubber moldings having an improved compression set.
摘要:
Perfluoroalkyleneethertriazine oligomer obtained by reacting a dinitrile compound NC-Rf⁰-CN with ammonia, further reacting the resulting diamizine compound with a dinitrile compound NC-Rf¹-CN, thereby obtaining a perfluoroalkyleneetherpolyimidoylamizine oligomer, then reacting the resulting oligomer with a perfluoronitrile compound Rf²CN, thereby treating the terminal groups thereof, and then subjecting the resulting terminal-treated oligomer to a ring-closing reaction with a perfluoroacylating agent RF³COY, has a good resistance to oxidation in the presence of a metal at a high temperature, and can improve the heat resistance of a perfluoropolyetherpolytetrafluoroethylene powder-based grease, when added therto.
摘要:
In an external casing (5) arranged vertical to fuel surface in a fuel tank of vehicles or the like are provided a slender resistance body (6) along the axial line of the external casing (5), a contact member (7) in sliding contact with the resistance body (6) and a support block (16) orfloat (22) for arranging the contact member (7) in the most suitable contact with the resistance body (6). The shape of contact point of the contact member (7) is arranged in such form as is capable of lessening the resistance of its contact with the resistance body (6) to an extent as feasible as possible. In order to avoid bad influence on the action of the resistance body (6) and contact member (7), there is formed a recess portion at the bottom of the external casing (5) for the fuel gauge.