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:
Dec. 21, 1993
Filed:
Mar. 06, 1991
Applicant:
Inventors:
Kenji Wakatsuru, Yamaguchi, JP;
Takehiko Kawate, Yamaguchi, JP;
Shigemi Shiraki, Yamaguchi, JP;
Toshihiro Sagane, Yamaguchi, JP;
Shuji Minami, Yamaguchi, JP;
Masayuki Okabe, Yamaguchi, JP;
Ryosuke Tomita, Yamaguchi, JP;
Hideaki Yamaguchi, Yamaguchi, JP;
Assignee:
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
526281 ; 526 88 ; 5261692 ; 526282 ; 526280 ; 528482 ; 528502 ;
Abstract
In accordance with the present invention, there are provided cycloolefin random copolymers composed of ethylene and cycloolefin and containing substantially no polyethylene, and processes for preparing the same. Optical disc substrates prepared from the above-mentioned copolymers are excellent in transparency and also capable of minimizing the occurence of errors in reading of the discs due to quality of the substrates used therefor.