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:
Sep. 13, 2011
Filed:
Nov. 16, 2007
Tomohiro Yamaguchi, Kuga-gun, JP;
Junpei Tanaka, Hatsukaichi, JP;
Shiro Otsuzuki, Kawasaki, JP;
Yasushi Tohi, Otake, JP;
Kouji Nagahashi, Iwakuni, JP;
Nobukazu Yamahira, Kuga-gun, JP;
Shigenobu Ikenaga, Ichihara, JP;
Sunil Krzysztof Moorthi, Ichihara, JP;
Kazunori Kamio, Ichihara, JP;
Tomohiro Yamaguchi, Kuga-gun, JP;
Junpei Tanaka, Hatsukaichi, JP;
Shiro Otsuzuki, Kawasaki, JP;
Yasushi Tohi, Otake, JP;
Kouji Nagahashi, Iwakuni, JP;
Nobukazu Yamahira, Kuga-gun, JP;
Shigenobu Ikenaga, Ichihara, JP;
Sunil Krzysztof Moorthi, Ichihara, JP;
Kazunori Kamio, Ichihara, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
Disclosed is a method for producing a syndiotactic propylene polymer having a syndiotactic pentad fraction (rrrr fraction) of not less than 85%, a melting point (Tm) within the range of 145-170° C. and a limiting viscosity [η] within the range of 0.1-10 dl/g by a solution polymerization method using a group 4 crosslinked metallocene compound, which is not accompanied by precipitation of a polymer (excluding white turbidity). Also disclosed is a production method which enables to continuously perform such a production.