Ethylene-propylene copolymer rubber composition having high modu

Details Ethylene-propylene copolymer rubber composition having high modu Ethylene-propylene copolymer rubber composition having high modu

1974-12-04

1976-01-06

Derrington, James H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 4233, 260 4242, 260 4575N, 260 458NT, 260 4595F, 260878R, C08K 304, C08K 322, C08L 2326

Patent

active

039310973

ABSTRACT:
An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, and the homogeneous rubber composition cured at 120.degree.-180.degree.C having a Young's modulus of 200-500 Kg/cm.sup.2, a tensile strength of at least 200 Kg/cm.sup.2, an elongation of at least 300%, a tear energy of at least 10 Kg/cm and retentions of Young's modulus and tensile strength at 70.degree.C of at least 50%.

REFERENCES:
patent: 3179715 (1965-04-01), Natta et al.
patent: 3632680 (1972-01-01), Hunt et al.

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