| http://www.w3.org/ns/prov#value | - The hydrophilic polymers having a carboxylic group and an amino group are three-dimensionally crosslinked by an epoxy ring-opening reaction, in which the polymer reacts with a polyepoxy compound, as a crosslinker, such as ethylene or propylene glycol diglycidyl ether, polyethylene or polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, or trime
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