| http://www.w3.org/ns/prov#value | - For example, the unesterified copolymer is heated under reflux in an organic solvent (for example, a hydrocarbon such as benzene or toluene; a hologenated hydrocarbon such as chloroform, dichloromethane or chlorobenzene; or a ketone such as acetone, methyl ethyl ketone or cyclohexanone) or without a solvent, in the presence of a condensation catalyst (for example, a strong acid such as sulfuric ac
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