| 摘要 |
A foamed plastic is provided which is excellent in heat resistance and mechanical strength. The foamed plastic is produced by foaming a resin which comprises an N-alkyl-substituted maleimide unit in an amount of 30 to 98 mol % and an olefin unit in an amount of 70 to 2 mol % of the entire polymer, and has a weight-average molecular weight of from 1x103 to 5x106 in terms of polystrene.
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