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:
Oct. 09, 2001
Filed:
Aug. 14, 1998
Chikashi Okayama, Ichihara, JP;
Takanori Nakashima, Ichihara, JP;
Masami Kimura, Ichihara, JP;
Mayumi Wakata, Ichihara, JP;
Kazuhiro Kimura, Ichihara, JP;
Toshiki Yamamoto, Ichihara, JP;
Hirohisa Ishii, Ichihara, JP;
Masataka Sugimoto, Ichihara, JP;
Kunio Gouda, Ichihara, JP;
Yasuhiro Mochizuki, Chiba, JP;
Noriaki Saito, Ichihara, JP;
Junichiro Yokota, Ichihara, JP;
Shouji Kawano, Ichihara, JP;
Yasuhiko Nakagawa, Ichihara, JP;
Chisso Corporation, Osaka, JP;
Abstract
A polypropylene composition for the production of various molded articles which are excellent in moldability, mold shrinkage factor on molding, rigidity, flexibility, impact resistance, in particular low-temperature impact resistance, transparency, gloss, stress-whitening resistance, and the balance thereof; various molded articles having the above properties; a propylene composition which is suitable for a base resin for the polypropylene composition; and a process for the production thereof. The propylene composition comprises a propylene homopolymer and a propylene-ethylene copolymer, the intrinsic viscosity of the copolymer ([&eegr;],) is in the range of 1.7 to 2.8 dl/g, the intrinsic viscosity ratio of the homopolymer to the copolymer ([&eegr;],/[&eegr;],) is in the range of 0.7 to 1.2 and a product [(W,/W,)×([&eegr;],/[&eegr;],)] of the weight ratio (W,/W,) of the homopolymer to the copolymer and the intrinsic viscosity ratio thereof is in the range of 1.0 to 3.0.