| http://www.w3.org/ns/prov#value | - The first crosslinking agent is preferably N,N-methylene bisacrylamide and the second crosslinking agent, a surface crosslinking agent, is one having at least two epoxy groups wherein the group presents in the polymer such as hydroxy group, sulfonic group, amino group, and the like, or any crosslinking agent having at least two functional groups which are reacted with the carboxylate.
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