prov:value
| - Other monomers which may be employed include those having the following structural formula: ##STR5## wherein R7 is hydrogen or lower alkyl (C1 -C4) such as methyl, ethyl, n-propyl, butyl and the like and R8 is a straight, branched or cyclic radical having from 2 to 14 carbon atoms for example an alkyl, alkoxyalkyl or alkylthioalkyl including ethyl, n-propyl, n-butyl, isobutyl, 1- or 2-methylbutyl,
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