| http://www.w3.org/ns/prov#value | - By way of example, one useful process comprises dissolving polymethyl methacrylate and ammonia or a primary amine (such as methylamine or ethylamine) in a suitable solvent (selected, for example, from aromatic hydrocarbons such as benzene, toluene, xylene and ethylbenzene; alcohols such as methanol, ethanol and propanol; and mixtures of two or more these solvents), and heating the reaction mixture
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