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:
Oct. 29, 1991
Filed:
Nov. 08, 1989
Masayoshi Oshima, Niiza, JP;
Teiji Kohara, Kawasaki, JP;
Tohru Hosaka, Yokohama, JP;
Tadao Natsuume, Yokosuka, JP;
Nippon Zeon Co., Ltd., Tokyo, JP;
Abstract
(1) A solvent-soluble ring-opened polymer constituted of 100-50% by weight of a norbornene derivative of monomer (A) represented by the formula ##STR1## wherein, R.sub.1 and R.sub.2 are the same or different and each denote hydrogen or alkyl and m denotes an interger of 0 to 2, and 0-50% by weight of another norbornene derivative of monomer (B) capable of undergoing ring-opening copolymerization with the preceding monomer (A), the polymer having a number average molecular weight of 10,000 to 50,000, a weight average molecular weight-to-number average molecular weight ratio (Mw/Mn) of up to 3, and a glass transition temperature of at least 80.degree. C., and (2) a process for producing such ring-opened polymers as stated above.