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    • 123. 发明专利
    • OPTICAL MATERIAL
    • JPH05196801A
    • 1993-08-06
    • JP15943891
    • 1991-06-04
    • TOSOH CORP
    • DOI TORUISHIKAWA TOMOHIRO
    • C08F210/00C08F22/36C08F220/52C08F222/40G02B1/04
    • PURPOSE:To obtain the optical material having excellent transparency, heat resistance, surface hardness and mechanical strength, etc., by using a specific N-alkyl substd. maleimide-olefin copolymer. CONSTITUTION:The optical material consists of a resin in which 50 to 90mol% of the entire part of the polymer is a constituting unit consisting of the compd. expressed by formula I, 50 to 2mol% of the entire part of the polymer is a constituting unit consisting of the compd. expressed by formula II and the weight average mol.wt. in terms of polystyrene is >=1X10 and . In the formulas, R1 denotes 1 to 18C alkyl group or 3 to 8C cycloalkyl group; R2 denotes hydrogen or 1 to 8C alkyl group; R3, R4 denote 1 to 8C alkyl group. The resin is obtd. by the radical copolymn. reaction of, for example, N-alkyl substd. maleimides and olefins. The compd. to yield the constituting unit of the formula I is N-alkyl substd. maleimides, such as N-methyl maleimide and the compd. to yield the constituting unit of the formula II is olefins, such as isobutene.