Novel propylene copolymers
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsMasaki Fujii, Mitsutaka Miyabayashi, Hironori Todaka, Satoru Hattori
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Abstract
A new propylene copolymer comprises a propylene homopolymer block and a terpolymeric random copolymer block of propylene, ethylene, and hexene-1 and is further characterized in that: (a) the proportion therein of the propylene homopolymer block is 97 to 80 percent by weight; (b) the terpolymeric random copolymer block has been so copolymerized that the contents therein of the propylene, ethylene, and hexene-1 based on their respective monomers are 80 to 98 percent, 5 to 1 percent, and 15 to 1 percent, respectively, all percentages being by weight; and (c) the intrinsic viscosity thereof in a decalin solution at 135.degree. C. is 0.3 to 15 dl/g.
Claims5
A propylene copolymer which comprises a block comprising a homopolymer of propylene and a block comprising a ternary random copolymer of propylene, ethylene, and hexene-1, and in which:
- (a) the proportion of the propylene homopolymer block in the propylene copolymer is 3 to 20 percent by weight;
- (b) the proportion of the ternary randon copolymer block in the propylene copolymer is 97 to 80 percent by weight;
- (c) the ternary random copolymer block comprises the portions based on the propylene, ethylene, and hexene-1 of 80 to 98 percent, 5 to 1 percent, and 15 to 1 percent, respectively, all percentages being by weight;
- and
- (d) the intrinsic viscosity of the propylene copolymer in decalin at 135.degree. C. is 0.3 to 15 dl/g.
Dependencies are inferred from the claim text.