| 摘要 |
PROBLEM TO BE SOLVED: To provide a new maleimide copolymer having high heat resistance and high transparency and having excellent characteristics when used for optical applications. SOLUTION: The maleimide copolymer is composed of (a) at least one kind selected from structural units represented by general formula (1) (wherein, R<SP>1</SP>denotes an organic group; R<SP>2</SP>denotes an alkyl group or an acyl group; and m is a number of 0-2) and general formula (2) äwherein, R<SP>3</SP>denotes a hydrogen atom or a methyl group; and X denotes a substituent represented by formula (3) (wherein, R<SP>4</SP>denotes an organic group; R<SP>5</SP>denotes an alkyl group or an acyl group; n is a number of 0-2; and p is a number of 1-5)} and (b) a structural unit having a maleimide skeleton represented by general formula (4) (wherein, R<SP>6</SP>is an alkyl group or an alicyclic group). The ratio of amounts (molar ratio) of the structural unit (a) to the structural unit (b) in the copolymer is within the range of (95:5) to (30:70). COPYRIGHT: (C)2006,JPO&NCIPI
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