| http://www.w3.org/ns/prov#value | - The most preferred functionalities for technique of the present invention is to chemically modify the polymer to have chemical moieties present within its structure which contain or constitute at least one acyl functional group, i.e. ##STR4## wherein X is hydrogen, nitrogen, hydroxy, oxyhydrocarbyl (e.g. ester), oxygen, the salt moiety --OM wherein M is a metal, e.g. alkali, alkaline earth, transi
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