prov:value
| - A process according to claim 2 wherein the monomers are of the formula wherein R and R??? each, independently of the other, is a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, an arylalkyl group, an alkylaryl group, an arylalkyloxy group, an alkylaryloxy group, a heterocyclic group, or mixtures thereof.
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