| http://www.w3.org/ns/prov#value | - hilic polymer and having a Tg <20??? C., said optional monomer B is capable of forming a hydrophilic or hydrophobic polymer, and said macromer C comprises a hydrophilic macromer represented by the formula: ##STR1## wherein R1 represents a hydrogen atom or a C1-5 alkyl group; R2 is H or C1-5 alkyl; and in which m is an integer of from 2 to 6 and n is an integer of from 5 to 300.
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