| http://www.w3.org/ns/prov#value | - Typical dianhydride reactants are of the general formula ##STR132## wherein R is an alkyl group, including cyclic and substituted alkyl groups, preferably with from 1 to about 30 carbon atoms, an aryl group, including substituted aryl groups, preferably with from 6 to about 30 carbon atoms, or an arylalkyl group, including substituted arylalkyl groups, preferably with from 7 to about 30 carbon ato
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