prov:value
| - A process according to claim 4 wherein the monomers are of the formula wherein each of R1, R2, R3, and R4, independently of the others, 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, or a heterocyclic group.
|