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:
Aug. 04, 2015
Filed:
Nov. 06, 2012
Jx Nippon Oil & Energy Corporation, Tokyo, JP;
Keio University, Tokyo, JP;
Sayako Uchizawa, Tokyo, JP;
Akira Matsuo, Tokyo, JP;
Yasuo Matsumura, Tokyo, JP;
Ayumu Komata, Tokyo, JP;
JX Nippon Oil & Energy Corporation, Tokyo, JP;
KEIO UNIVERSITY, Tokyo, JP;
Abstract
The present invention can provide a methacrylic resin which has excellent transparency and color and less defects such as fish eyes and thus suitable for optical films by adding (A) a polymeric dispersant represented by formula (1) below and (B) an inorganic salt and/or organic salt selected from alkali metal salts, alkaline earth metal salts and ammonium salts when methyl methacrylate alone or a monomer mixture containing methyl methacrylate as one component is subjected to suspension-polymerization: (n=10 to 60 mol %, m=40 to 90 mol %, Ris hydrogen or a methyl group, Ris an alkyl group having 1 to 8 carbon atoms, and M is an alkali metal or alkaline earth metal or NH.)