×

Ethylene-alpha-olefin-polyene random copolymer rubber

  • US 4,510,303 A
  • Filed: 05/06/1983
  • Issued: 04/09/1985
  • Est. Priority Date: 05/06/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. Ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms, and a polyene, wherein:

  • (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5;

    (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1;

    (C) an iodine value of the copolymer rubber is 2 to 40;

    (D) an intrinsic viscosity [η

    ] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135°

    C.; and

    (E) g.sub.η

    * defined by a ratio of the intrinsic viscosity [η

    ] to an intrinsic viscosity [η

    ]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.8.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×