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:
Nov. 20, 2001
Filed:
May. 20, 1998
Chikashi Okayama, Ichihara, JP;
Takanori Nakashima, Ichihara, JP;
Shinichi Akitaya, Ichihara, JP;
Yoshitaka Sumi, Ichihara, JP;
Chisso Corporation, Osaka, JP;
Abstract
A propylene polymer blend is disclosed which comprises (A) a propylene-&agr;-olefin random copolymer with a propylene content of 90 to 99% by weight and (B) a propylene-&agr;-olefin random copolymer with a propylene content of 55 to 90% by weight, wherein the intrinsic viscosity ([&eegr;,]) of the copolymer B ranges from 1.3 to 3.5 dl/g, the ratio ([&eegr;,]/[&eegr;,]) of the intrinsic viscosity ([&eegr;,]) of the copolymer B to the intrinsic viscosity ([&eegr;,]) of the copolymer A ranges from 0.5 to 1.3 and a product (([&eegr;,]/[&eegr;,])×(W,/W,)) of the intrinsic ratio ([&eegr;,]/[&eegr;,]) of both copolymers and the weight ratio (W,/W,) of both copolymers ranges from 1.0 to 4.5. A polypropylene resin composition comprises 99 to 99.9999% by weight of the propylene polymer blend and 1 to 0.0001% by weight of an &agr;-crystal nucleating agent.