| http://www.w3.org/ns/prov#value | - Examples of particularly useful copolymers and terpolymers prepared from the c b-olefinic dicarboxy compounds are the copolymers of maleic anhydride and a vinyl compound such as ethylene, propylene, isobutylene, styrene, 06-1116thYlStYI'6I1C, vinyl acetate, vinyl propionate, methyl isopropenyl ketone, isobutyl vinyl ether, etc., the copolymers of dialkyl fumarate such as ethyl or butyl fumarate an
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