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. 20, 2018
Filed:
Jun. 19, 2014
Japan Polypropylene Corporation, Chiyoda-ku, JP;
Tomohiro Hosoi, Mie, JP;
Shigeo Mizukami, Mie, JP;
Masahiro Nagata, Mie, JP;
Kouichi Nakayama, Mie, JP;
Yuji Ryosho, Mie, JP;
JAPAN POLYPROPYLENE CORPORATION, Chiyoda-ku, JP;
Abstract
An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [η]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [η]c of 7.0 dL/g or higher ([η]c/[η]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.