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:
Apr. 07, 1992
Filed:
Mar. 12, 1990
Applicant:
Inventors:
Koji Chono, Kurashiki, JP;
Hiroshi Ozeki, Kurashiki, JP;
Kazunori Toshima, Kitamoto, JP;
Motoyuki Yamato, Kanagawa, JP;
Assignee:
Nippon Zeon Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; C08F / ;
U.S. Cl.
CPC ...
264 406 ; 264237 ; 264327 ; 2643282 ; 2643286 ; 26432814 ; 26432816 ; 26432817 ; 26432818 ; 26433112 ; 26433113 ; 26433117 ; 525290 ; 526283 ;
Abstract
A method of producing a pore-free polynorbornene article having thick-walled portions is provided. The method comprises providing a monomer charge containing at least one norbornene monomer having a tricyclic or higher cyclic structure; introducing the monomer charge into a mold at a temperature greater than the inside mold temperature; polymerizing the monomer charge under pressure via a ring-opening catalyst system; cooling the molded article; and removing the molded article from the mold.