Ethylene-alkenyl aromatic compound copolymer, process for the production thereof, and molded article thereof
AssigneeSumitomo Chemical Company, Limited
InventorsNobuo Oi, Yuki Iseki, Yasuro Suzuki
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Abstract
An ethylene-alkenyl aromatic compound copolymer, the copolymer having a melt viscosity η*190 at a shear rate of 100 radian/second at 190° C. of 3.0×103 to 3.0×106 poises, and a molecular weight distribution in terms of weight average molecular weight(Mw) to number average molecular weight(Mn) [Mw/Mn ] of 1.2 to 4.0, and wherein a zero-shear melt viscosity η*0 (poise) and a characteristic relaxation time τ0 (second) satisfy the relation of the expression (1) below; log τ0>log η*0−6.38 (1)
Claims14
An ethylene-mono-alkenyl aromatic compound copolymer, said copolymer having a melt viscosity η*100 at a shear rate of 100 radian/second at 190° C. of 3.0×103 to 3.0×106 poises and a molecular weight distribution in terms of weight average molecular weight(Mw) to number average molecular weight(Mn)[Mw/Mn ] of 1.2 to 4.0, and wherein a zero-shear melt viscosity η*0 (poise) and a characteristic relaxation time τ0 (second) of the copolymer satisfy the relation of the expression (1) below;
- log τ0>log η* 0−6.38 (1).
Dependencies are inferred from the claim text.