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. 12, 1995
Filed:
Jul. 01, 1992
Applicant:
Inventors:
Hiroyuki Koura, Ichihara, JP;
Takeshi Ebara, Ichihara, JP;
Kazuki Wakamatsu, Sodegaura, JP;
Shouzou Kawamata, Ichihara, JP;
Yoshizumi Sasaki, Ichihara, JP;
Assignee:
Sumitomo Chemical Company, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525247 ; 525254 ; 525270 ; 525323 ;
Abstract
The present invention relates to a process for producing ethylene propylene block copolymers excellent in appearance, elongation and impact resistance when molded by a gas phase polymerization which can be conducted in a stable manner. The process of the present invention comprises the first step of polymerizing propylene by using a catalyst system composed essentially of