| http://www.w3.org/ns/prov#value | - As typical examples of the cross-linking agent which answers this description, compounds having at least two polymerizable unsaturated double bonds in the molecular unit thereof, compounds having at least two groups capable of reacting with a functional group such as acid group, hydroxyl groups, amino group, etc. in the molecule which is possessed by the water-soluble ethylenically unsaturated mon
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