Ethylene-α-olefin-nonconjugated polyene copolymer
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United States of America Patent
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Feb 24, 2015
Grant Date -
Oct 23, 2014
app pub date -
Dec 18, 2012
filing date -
Dec 21, 2011
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Abstract
Provided is an ethylene-α-olefin-nonconjugated polyene copolymer having ethylene units, α-olefin units and nonconjugated polyene units, wherein the copolymer satisfies the following requirements: (A): the intrinsic viscosity [η] is 0.5 to 1.8 dl/g, (B): the content of ethylene units is 50 to 90 mol % and the content of α-olefin units is 50 to 10 mol % where the sum total of the contents of ethylene units and α-olefin units is taken as 100 mol %, (C): the iodine value is 1 to 50, (D): the ratio of tan δ taken at 100° C. and 2 cpm to tan δ taken at 100° C. and 1000 cpm is from 1.0 to 1.7, and (E): the ratio of the Z-average molecular weight to the number average molecular weight is from 15 to 25 and the weight average molecular weight to the number average molecular weight is from 3 to 5.
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