Patent ID: 6140441
Filing Date: 2000-10-31
Classification: C08F

Abstract:
An amorphous or low-crystalline ethylene random copolymer derived from an ethylene (a), an .alpha.-olefin (b) having 3 to 20 carbon atoms and a nonconjugated polyene (c) having a norbornene skeleton, and simultaneously satisfying the following requirements (1) to (6):(1) the molar ratio (a)/(b) of the ethylene (a) to the .alpha.-olefin (b) is from 40/60 to 95/5;(2) the amount of the nonconjugated polyene (c) is from 0.5 to 50 (g/100 g) in terms of an iodine value of the copolymer;(3) the effective network-chain density .nu. is not smaller than 1.5.times.10.sup.20 number/cm.sup.3 when press-cured at 170.degree. C. for 10 minutes by using 0.01 mol of a dicumyl peroxide per 100 g of the copolymer;(4) the effective network-chain density .nu. and a ratio .gamma.2/.gamma.1 of a shearing rate .gamma.2 of when a shearing stress 2.4.times.10.sup.6 dynes/cm.sup.2 is exhibited to a shearing rate .gamma.1 of when a shearing stress 0.4.times.10.sup.6 dynes/cm.sup.2 is exhibited as found from a melt flow curve at 100.degree. C., establish a relationship represented by the general formula (I),0.04.times.10.sup.-19 .ltoreq.log(.gamma.2/.gamma.1)/.nu..ltoreq.0.020.times.10.sup.-19(I)and;(5) an intrinsic viscosity (.eta.) as measured in decalin at 135.degree. C. is from 0.5 to 10 dl/g(6) a molecular weight distribution (Mw/Mn) of from 3 to 50.