Process for the preparation of nitrogen- and fluorine-containing
申请人:Rohm and Haas Company
公开号:US03968150A1
公开(公告)日:1976-07-06
1. A method for the preparation of difluoraminoalkyl acrylates and methacrylates in which there are at least two difluoramino groups present and the alkyl contains two to eighteen carbon atoms which comprises reacting in the temperature range of about 0.degree. C. up to the reflux temperature of the reaction mixture a member from the class consisting of a difluoraminoalkyl .alpha.,.beta.-dibromopropionate and difluoraminoalkyl .alpha.,.beta.-dibromoisobutyrate in the presence of a compound having the formula ##EQU1## wherein R is a member from the group consisting of alkoxy one to four carbon atoms, alkyl one to eight carbon atoms, phenyl, alkylphenyl in which the alkyl portion contains from one to eight carbon atoms, phenoxy and alkylphenoxy in which the alkyl portion contains from one to eight carbon atoms.
A rubber composition comprising (i) a nitrile group-containing highly saturated copolymer rubber, which is a product obtained by hydrogenating the conjugated diene portion of an unsaturated nitrile-conjugated diene copolymer, and (ii) an ethylene-α-olefin-non-conjugated diene copolymer rubber. The highly saturated copolymer rubber has an alkylthio group having 12 to 16 carbon atoms, which include at least three tertiary carbon atoms, and has a sulfur atom which is directly bound to at least one of the tertiary carbon atoms; and the highly saturated copolymer rubber further has a Mooney viscosity of 15 to 200 and an iodine value not larger than 80.
Highly saturated nitrile rubber, process for producing same, vulcanizable rubber composition, aqueous emulsion and adhesive composition
申请人:NIPPON ZEON CO., LTD.
公开号:EP0704459A1
公开(公告)日:1996-04-03
A nitrile group-containing highly saturated copolymer rubber which is a hydrogenated product of an unsaturated nitrile-conjugated diene copolymer. The highly saturated copolymer rubber has an alkylthio group having 12 to 16 carbon atoms, which include at least three tertiary carbon atoms, and having a sulfur atom which is directly bound to at least one of the tertiary carbon atoms, and the highly saturated copolymer rubber further has a Mooney viscosity of 15 to 200 and an iodine value not larger than 80. The highly saturated copolymer rubber is produced by copolymerizing an unsaturated nitrile and a conjugated diene by using as a specific alkylthiol molecular weight modifier. The highly saturated copolymer rubber exhibits a high-rate vulcanizability with a sulfur-containing vulcanizer.
CURABLE RUBBER COMPOSITION FOR THE SEAL AGAINST HOT WATER
申请人:NIPPON ZEON CO., LTD.
公开号:EP0869144A1
公开(公告)日:1998-10-07
This invention provides a vulcanizable rubber composition for use as hot-water seals comprising 100 parts by weight of a rubber mixture composed of 90 to 50% by weight of a nitrile-containing highly saturated copolymer rubber obtained by hydrogenating the conjugated diene portions of an unsaturated nitrile-conjugated diene copolymer rubber or unsaturated nitrile-conjugated diene-ethylenically unsaturated monomer terpolymer rubber, and 10 to 50% by weight of an ethylene-α-olefin copolymer rubber; 0.1 to 30 parts by weight of an organic peroxide vulcanizing agent; and optionally 10 to 100 parts by weight of carbon black. Seals formed by vulcanizing this composition show a very low percent change in volume and elongation, and are not liable to the release of carbon black or the production of surface cracks, upon exposure to hot water containing bleaching powder.
RUBBER COMPOSITION LOWERED IN HEAT BUILD-UP AND ROLLS
申请人:NIPPON ZEON CO., LTD.
公开号:EP0878503A1
公开(公告)日:1998-11-18
A rubber composition having a reduced heat build-up, which comprises (a) 100 wt. parts of an elastomer capable of being crosslinked by an organic peroxide crosslinking agent, (b) 10 - 150 wt. parts of a metal salt of an α,β-ethylenically unsaturated carboxylic acid, (c) 5 to 100 wt. parts of magnesium oxide having a BET specific surface area not larger than 25 m2/g, and (d) 0.1 to 30 wt. parts of an organic peroxide crosslinking agent. A roll having an outer peripheral surface portion composed of a vulcanizate of the rubber composition. The roll has high strengths and reduced heat build-up, and is especially suitable for use under a high load.