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:
Aug. 25, 1992
Filed:
Nov. 06, 1989
Masahiro Kakugo, Chiba, JP;
Hajime Sadatoshi, Chiba, JP;
Jiro Sakai, Chiba, JP;
Kazuki Wakamatsu, Chiba, JP;
Kazuhiro Chikaishi, Ibaraki, JP;
Toshiro Kojima, Ibaraki, JP;
Hideo Nomura, Ibaraki, JP;
Tomohisa Fukao, Chiba, JP;
Sumitomo Chemical Co., Ltd., Osaka, JP;
Abstract
Crystalline polypropylene excellent in rigidity, heat resistance and surface hardness is disclosed, having a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw/Mn) of 10 or more, an intrinsic viscosity [.eta.] of from 0.8 to 5.0 dl/g as measured in tetralin at 135.degree. C., a cold xylene-soluble content (CXS) of not more than 4% by weight, a density (d) of 0.910 g/cm.sup.3 or more as measured at 23.degree. C., and a long period (L) (.ANG.) as measured at 25.degree. C. by a small-angle X-ray scattering method satisfying relationship: