| 摘要 |
PURPOSE:To obtain the titled copolymer of good balance among its physical properties, by heat treatment, using an organic peroxide, of specific propylene- ethylene block copolymer. CONSTITUTION:The objective copolymer can be obtained by incorporating (A) an organic peroxide (e.g. 2,5-dimethyl-2.5-t-butyl peroxyhexane) in (B) a propylene- ethylene block copolymer having the following characteristics: i) kerosene solubles at 30 deg.C...>=5wt% ii) ethylene content of said solubles ...20-70wt% iii) ratio of weight-average molecular weight to number-average molecular weight (MW/ MN)...>=6.0 (determined by gel permeation chromatography) followed by heating.
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