摘要:
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. 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 atom, 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 copolymerizing an unsaturated nitrile, a conjugated diene and an optional copolymerizable monomer by using as a molecular weight modifier an alkylthiol compound 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 then, hydrogenating the thus-obtained copolymer. The highly saturated copolymer rubber exhibits a high-rate vulcanizability when vulcanized with a sulfur-containing vulcanizer.
摘要:
An adhesive for bonding a nitrile group-containing highly saturated rubber to glass fibers or organic synthetic fibers, which comprises a nitrile group-containing highly saturated rubber latex having an iodine number of not more than 120 and a resorcinol-formaldehyde resin.
摘要:
A vulcanizable rubber composition including a partially hydrogenated unsaturated nitrile-conjugated diene copolymer having an iodine value of smaller than 25, a sulfur vulcanizer and a tellurium dithiocarbamate compound as a vulcanization promotor. This rubber composition provides a vulcanizate having reduced heat build-up, reduced compression set and high mechanical strength.
摘要:
A nitrile group-containing rubber latex comprising an aqueous dispersion of a nitrile group-containing highly saturated rubber having an iodine value of not more than 120. The said rubber latex can be produced by converting a solution of a nitrile group-containing highly saturated polymer rubber having an iodine value of not more than 120 in an inert solvent into an oil-in-water emulsion using water and an emulsifier, and removing the solvent from the resulting emulsion.
摘要:
A method of treating polyester fibers, which comprises(1) treating the polyester fibers with an adhesive composition (AR) comprising a latex (A) of a vinylpyridine/conjugated diene copolymer having a vinylpyridine unit content of at least 20% by weight but not more than 70% by weight and a resorcinol-formaldehyde resin as main components, and(2) further treating it with an adhesive composition (BR) comprising a latex (B) of a ntirile group-containing highly saturated copolymer rubber having an iodine number of not more than 120 and a resorcinol-formaldehyde resin as main components. A composite obtained by bonding the treated polyester fibers to a nitrile group-containing highly saturated copolymer rubber by vulcanization has high initial and heat-resistant adhesion strength, and is useful for production of timing belts and polyribbed belts.
摘要:
A method of preventing degradation of vulcanized rubber materials used in the operation of oil and gas wells comprising forming said rubber material from a sulfur vulcanized composition comprising a copolymer rubber having in the polymer chain (I) 10 to 60% by weight of a unit from an unsaturated nitrile, (II) not more than 10% by weight of a unit from a conjugated diene, and (III) 30 to 90% by weight of a unit from an ethylenically unsaturated monomer other than the unsaturated nitrile and/or a unit resulting from the hydrogenation of a unit from a conjugated diene, said rubber being vulcanized with a sulfur vulcanization system.
摘要:
A laminate of vulcanizable rubber composition layers, which comprises (i) a vulcanizable fluororubber composition layer comprising a fluororubber and a metal oxide and (ii) a vulcanizable nitrile rubber composition layer consisting essentially of a nitrile rubber, an organic phosphonium salt of the following formula (1), an organic peroxide crosslinking system, and an organic basic vulcanization accelerator: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrocarbyl, and no more than three thereof may be amino or fluoroalkyl; and R.sub.5 is hydrogen or alkyl. A vulcanized laminate made of the vulcanizable rubber composition layers is useful for a fuel hose or a diaphragm.
摘要:
A composite comprised of a nitrile group-containing highly saturated copolymer rubber and a fibrous material, which copolymer rubber is a product obtained by hydrogenating the conjugated diene portion 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 copolymer rubber further has a Mooney viscosity of 15 to 200 and an iodine value not larger than 80. This composite is useful for a belt.
摘要:
Disclosed herein is a rubber covered roll comprising a metallic core and at least one covering rubber layer. The covering rubber layer is a vulcanized rubber layer formed by a rubber composition comprising an ethylenically unsaturated nitrile-conjugated diene type highly saturated copolymer rubber (A) having a conjugated diene unit content of the polymer chain of at most 25 wt. % and the zinc salt (B) of an ethylenically unsaturated carboxylic acid. A covering rubber layer coming into contact with the metallic core is at least a vulcanized rubber layer formed by a rubber composition comprising 100 parts by weight of a rubber component containing at least 50 wt. % of the highly saturated copolymer rubber (A) and 10-40 parts by weight of the zinc salt (B). A rubber composition for rubber covered rolls is also disclosed. It comprises 100 parts by weight of a rubber component containing 90-50 wt. % of the highly saturated copolymer rubber (A) and 50-10 wt. % of a diene rubber, and 10-40 parts by weight of the zinc salt (B) of an ethylenically unsaturated carboxylic acid.
摘要:
An adhesive for bonding a nitrile group-containing highly saturated rubber to glass fibers or organic synthetic fibers, which comprises a nitrile group-containing highly saturated rubber latex having an iodine number of not more than 120 and a resoncinol/formaldehyde resin.