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Highly saturated nitrile copolymer rubber, process for the production thereof, heat-resistant rubber compositions comprising the rubber and composites comprising the rubber and fibers

  • US 6,489,385 B1
  • Filed: 05/20/1999
  • Issued: 12/03/2002
  • Est. Priority Date: 03/29/1996
  • Status: Expired due to Term
First Claim
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1. A highly saturated nitrile group-containing copolymer rubber having a Mooney viscosity lowered by 15 points or more by applying a shearing force at a shearing rate of from 500 to 5,000 S

  • 1 thereto in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°

    C. to 380°

    C., which has a Mooney viscosity of from 5 to 135 and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) of 3 to 5, and exhibits an increase in Mooney viscosity of 10 points or fewer while the rubber is allowed to stand in the air at room temperature for 30 days after the above-lowering of Mooney viscosity, said copolymer rubber being a hydrogenation product of a copolymer comprising ethylenically unsaturated nitrile monomer units, diene monomer units and optional copolymerizable monomer units wherein the content of the ethylenically unsaturated nitrile monomer units in the copolymer is in the range of 10 to 60% by weight, said copolymer rubber having an iodine value of not larger than 120 as measured before applying the high shearing force, and said aging inhibitor being at least one member selected from the group consisting of aromatic secondary amine-containing, amine-ketone-containing, mercaptobenzoimidazole-containing, bisphenol-containing, monophenol-containing, thiobisphenol-containing, hydroquinone-containing, nickel salt-containing, thiourea-containing, thioether-containing and phosphorus-containing aging inhibitors.

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