Patent ID: 6410650
Filing Date: 2002-06-25
Classification: C08F,C09K

Abstract:
An ethylene-&agr;-olefin-non-conjugated polyene copolymer rubber comprising ethylene, an &agr;-olefin having 3 to 20 carbon atoms and a non-conjugated polyene, characterized in that:(i) the intrinsic viscosity [&eegr;] as measured in decalin solvent at 135Â° C. is 1.5 to 5.0 dl/g; (ii) the g&eegr;â€¡ or gâ€² value is 0.6 to 0.9, wherein the g&eegr;â€¡ value is defined as a ratio of the intrinsic viscosity [&eegr;] as measured in (i) above to an intrinsic viscosity [&eegr;]blank as measured in decalin solvent at 135Â° C. of a linear ethylene-propylene copolymer having an ethylene content of 70% by mole which has the same weight average molecular weight (according to light scattering method) as the ethylene-&agr;-olefin-non-conjugated polyene copolymer rubber having the intrinsic viscosity [&eegr;] ([&eegr;]/[&eegr;]blank), and the gâ€² value is defined as a ratio of the intrinsic viscosity [&eegr;] as measured in (i) above to an intrinsic viscosity [&eegr;]blankâ€² as reduced to a linear ethylene-propylene copolymer having an ethylene content of 70% by mole, which is determined by gel permeation chromatography (140Â° C., o-dichlorobenzene solvent) of the ethylene-&agr;-olefin-non-conjugated polyene copolymer (gâ€²=[&eegr;]/[&eegr;]blankâ€²); (iii) the Mw/Mn is 3.0 to 50; (iv) the iodine value is 10 to 40; (v) the molar ratio of ethylene to the &agr;-olefin having 3 to 20 carbon atoms is 40/60 to 95/5; and (vi) the intensity ratio D of T&agr;&bgr; to T&agr;&agr; in 13C-NMR spectrum (T&agr;&bgr;/T&agr;&agr;) is 0.5 or less.