prov:value
| - A process for preparing a linear copolymer having a weight-average molecular weight of 1,000 to 1,000,000 consisting of a recurring unit represented by the formula (I) and a recurring unit represented by the formula (II): ##STR160## wherein R1, R2, R3 and R4 each independently is a hydrogen atom, a C1-10 alkyl group, a C6-10 cycloalkyl group, a C6-10 aryl group, or a halogen atom, X and Y each ind
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