| http://www.w3.org/ns/prov#value | - Examples of suitable C groups include those based on polycarbonates, wherein C is ##STR114## and the polymer thus contains a ##STR115## linkage, those based on polyurethanes and polyisocyanates, wherein C is of the general formula ##STR116## and the polymer thus contains a ##STR117## linkage, wherein R is an alkyl group, including cyclic and substituted alkyl groups, preferably with from 1 t
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