| http://www.w3.org/ns/prov#value | - Preferred resins contain at least one or more polar groups selected from COOM, SO3 M, OSO3 M, P???O(OM)2, O--P???O(OM)2 (wherein M is a hydrogen atom or an alkali metal such as K, Li and Na), OH, NR2, N+ R3, (wherein R is a hydrocarbon group), an epoxy group, SH, and CN introduced into the resin by a copolymerization or addition reaction as needed in order to obtain excellent dispersibility and du
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