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:
Jun. 11, 1991
Filed:
Aug. 28, 1989
Hisao Anzai, Otake, JP;
Isao Sasaki, Saeki, JP;
Kozi Nishida, Toyama, JP;
Hideaki Makino, Otake, JP;
Masami Ohtani, Kuga, JP;
Katsuhiko Shimada, Otake, JP;
Mitsubishi Rayon Company, Ltd., Tokyo, JP;
Abstract
A methacrylimide group-containing polymer having good optical characteristics, especially a resistance to coloration under heating and above to retain good light-transmitting characteristics for a long time even at a high temperature, is prepared by polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a mercaptan chain transfer agent, and then imidizing the thus-prepared polymer. The resulting polymer is useful as the core component of a light-transmitting fiber having a core-sheath structure.