| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new maleimide copolymer excellent in heat resistance and heat stability and further excellent in alkali solubility, which copolymer has a specified amount of N-substituted maleimide groups, aromatic vinyl monomer groups, and unsaturated monocarboxylic acid monomer groups. SOLUTION: There is provided a maleimide copolymer containing (1) a maleimide copolymer prepared by polymerizing a monomer component containing an N-substituted maleimide monomer, an aromatic vinyl monomer, and an unsaturated monocarboxylic acid monomer, having a content of insolubles in an aqueous alkali solution of at most 10%, and containing at most 10% compound (2) of a specified structure represented by formula I (wherein R1s, which are independent of each other, are each an alkyl, a cycloalkyl, an aryl, an alkyl-substituted aryl, or a halogen-substituted aryl; R2 is hydrogen or methyl; and R3 to R6 are each independently hydrogen, an alkyl, a cycloalkyl, or a cycloalkyl-, aryl- alkylaryl-, or halogen-substituted aryl).
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