Title:
OPTICAL RESIN COMPOSITION AND MANUFACTURE OF THE SAME
Document Type and Number:
Japanese Patent JP3183384
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an optical resin composition which has a limited tendency to deteriorate and to discolor at a high temp. in molding, a superior heat resistance, low hygroscopicity and low birefringence by making a specific methacrylic resin contain a specific antioxidant.
SOLUTION: This optical resin composition contains 100 pts.wt copolymer (A) consisting of 10-70wt.% methyl methacrylate unit, 5-30wt.% N-substd. maleimide unit, 15-18wt.% cyclohexyl methacrylate unit and 0-30wt.% another copolymerizable monomer and 0.05-0.5 pts.wt. compound (B) as represented by formula I (wherein (X) is tert.-butyl) and 0-0.5 pts.wt. compound (C) as represented by formula II (wherein R is a 12-15C alkyl). This composition is obtained by dissolving the components B and C into the mixture of methyl methacrylate, N-substd. maleimide, cyclohexyl methacrylate and another copolymerizable monomer and subjecting the mixture to suspension polymerization.
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Inventors:
Jun Nakauchi
Shigeaki Sasaki
Yukinori Okimoto
Shigeaki Sasaki
Yukinori Okimoto
Application Number:
JP34852995A
Publication Date:
July 09, 2001
Filing Date:
December 20, 1995
Export Citation:
Assignee:
Mitsubishi Rayon Co., Ltd.
International Classes:
G02B6/00; C08K5/103; C08K5/524; C08L33/04; C08L33/08; C08L33/12; C09K15/08; C09K15/32; (IPC1-7): C08L33/08; C08K5/103; C08L33/12; C09K15/08; G02B6/00
Domestic Patent References:
| JP63304045A | ||||
| JP5209102A |
Attorney, Agent or Firm:
Toshio Yoshizawa
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