C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 210/18 (2006.01) C08F 4/64 (2006.01) C08F 4/76 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)
Patent
CA 2165642
Disclosed is an ethylene-.alpha.-olefin-nonconjugated polyene random copolymer which is a random copolymer of (a) ethylene, (2) an .alpha.-olefin of 3 or more carbon atoms and (c) a nonconjugated polyene containing, in one molecule, one carbon-to-carbon double bond polymerizable by a metallocene catalyst among carbon-to-carbon double bonds, and has such properties that (i) the copolymer contains (a) units derived from ethylene and (b) units derived from the .alpha.- olefin of 3 or more carbon atoms in a molar ratio of 40/60 to 95/5 ((a)/(b)), (ii) the iodine value is in the range of 1 to 50, (iii) the intrinsic viscosity (?), as measured in decalin at 135 °C, is in the range of 0.1 to 8.0 dl/g, and (iv) the ratio g?* of the intrinsic viscosity (?) of the copolymer defined above to the intrinsic viscosity (?)blank of a linear ethylene-propylene copolymer having the same weight-average molecular weight (measured by light scattering method) as the ethylene-.alpha.-olefin-nonconjugated polyene random copolymer and having an ethylene content of 70 % by mol, (?)/(?)blank, is in the range of 0.2 to 0.9 or the ratio g' of the intrinsic viscosity (?) of said random copolymer defined above to the intrinsic viscosity (?)blank' of a linear ethylene-propylene copolymer having and ethylene content of 70 % by mol which is determined by measurement of gel permeation chromatography (GPC) of ethylene-.alpha.-olefin-nonconjugated polyene random copolymer in orthodichlorobenzene at 140 °C, (?)/(?) blank', is in the reange of 0.2 to 0.9. Also disclosed are a process for preparing the random copolymer and a vulcanizable rubber composition containing the random copolymer. The ethylene- .alpha.-olefin-nonconjugated polyene random copolymer and the rubber composition are excellent in weathering resistance, ozone resistance, mechanical strength and processability.
Kawasaki Masaaki
Okada Keiji
Sagane Toshihiro
Tanizaki Tatsuya
Tojo Tetsuo
Mitsui Chemicals Inc.
Smart & Biggar
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