| http://www.w3.org/ns/prov#value | - Preferable examples among them include a vinyl ether-based polymer having the constitutional unit represented by the general formula (III) ##STR3## wherein R6, R7 and R8 are each a hydrogen atom or a hydrocarbon radical, especially an alkyl group, having 1 to 10 carbon atoms; R9 is a divalent hydrocarbon radical, especially an alkylene group, having 1 to 10 carbon atoms or a divalent ether-linkage
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