The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2002
Filed:
Oct. 23, 2000
Takanori Nakashima, Ichihara, JP;
Shinichi Akitaya, Ichihara, JP;
Yoshitaka Morimoto, Ichihara, JP;
Yoshitaka Sumi, Ichihara, JP;
Other;
Abstract
A propylene block copolymer composition is disclosed which comprises (A) a propylene-&agr;-olefin random copolymer with a propylene content of 99.4 to 99.9 mol % and (B) a propylene-&agr;-olefin random copolymer with a propylene content of 35 to 60 mol %, &agr;-olefin contained in the random copolymer (A) being ethylene and/or 1-butene, wherein the intrinsic viscosity ([&eegr; ]) of the propylene-&agr;-olefin random copolymer (B) ranges from 0.5 to 2.0 dl/g, the ratio ([&eegr; ]/[&eegr; ]) of the intrinsic viscosity ([&eegr; ]) of the propylene-&agr;-olefin random copolymer (B) to the intrinsic viscosity ([&eegr; ]) of the propylene-&agr;-olefin random copolymer (A) ranges from 0.3 to 1.2 and the product (([&eegr; ]/[&eegr; ])×(W /W )) of the intrinsic viscosity ratio ([&eegr; ]/[&eegr; ]) and the weight ratio (W /W ) of both copolymers ranges from 1.0 to 3.0. The propylene block copolymer composition is suitable as a raw material for molded article having excellent see-through property, transparency, stress-whitening resistance, stiffness and heat resistance.