C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/08 (2006.01) C08L 53/00 (2006.01)
Patent
CA 2179976
A propylene block copolymer, a process for preparation of the propylene block copolymer, and a propylene resin composition comprising the propylene block copolymer. The propylene block copolymer comprises (a) from 35 to 95% by weight of a polypropylene block and (b) from 10 to 65% by weight of a block of a copolymer of a propylene and other .alpha.-olefins, the propylene block copolymer having: (i) in a crystallization temperature curve determined by a differential scanning calorimeter, besides a main peak, secondary peaks in a temperature range of from 90 to 100°C, and a proportion of the area of the secondary peaks to that of a main peak of from 1.5 to 10%; and (ii) a relationship between an amount of a soluble content on xylene extraction at 25°C and a proportion of the area of the secondary peaks to that of the main peak represented by equation (I): 0.1XIS - 1 SMA (I) wherein XIS represents an amount of a soluble content on xylene extraction at 25°C in terms of percent by weight; and SMA represents a proportion of the area of the secondary peaks to that of the main peak in terms of percent.
Watanabe Kazuyuki
Yanagihara Hisayoshi
G. Ronald Bell & Associates
Japan Polyolefins Co. Ltd.
Watanabe Kazuyuki
Yanagihara Hisayoshi
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