C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 236/20 (2006.01) C08F 6/00 (2006.01) C08F 10/00 (2006.01) C08F 210/18 (2006.01) C08L 9/00 (2006.01) C08L 21/00 (2006.01) C08L 23/16 (2006.01) C08L 47/00 (2006.01) C08F 4/659 (2006.01) C08F 210/06 (2006.01) C08F 210/16 (2006.01)
Patent
CA 2087905
The ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber of the invention is a random copolymer rubber prepared using a Group IVB transition metal type catalyst containing a specific zirconium catalyst component, and in this copolymer rubber, a molar ratio of ethylene to .alpha.- olefin, a diene content, an intrinsic viscosity [.eta.], an intensity ratio D of T.alpha..beta. to T.alpha..alpha. in a 13C-NMR spectrum of said copolymer rubber, a B value which is a measure of distribution of each monomers and a glass transition temperature are all within specific ranges. The rubber composition of the invention comprises the above-mentioned random copolymer rubber and a conjugated diene rubber. The random copolymer rubber has high stereoregularity, narrow composition distribution and excellent low-temperature flexibility, and shows extremely high covulcanizability with the conjugated diene rubber. In addition, this random copolymer rubber is excellent in weathering resistance, ozone resistance and thermal aging resistance.
Honma Kiyoshi
Kawasaki Masaaki
Nakahama Hidenari
Onda Mitsuhiko
Takata Toshimasa
Mitsui Chemicals Inc.
Mitsui Petrochemical Industries Ltd.
Smart & Biggar
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