초록 ▼

A highly water absorbent polymer having high resistance to salt solution is prepared by crosslinking a hyrophilic polymer or copolymer having carboxyl and/or carboxylate groups and water content of 10 to 40 wt. % with a crosslinking agent having at least two functional groups capable of reaction wit

A highly water absorbent polymer having high resistance to salt solution is prepared by crosslinking a hyrophilic polymer or copolymer having carboxyl and/or carboxylate groups and water content of 10 to 40 wt. % with a crosslinking agent having at least two functional groups capable of reaction with said carboxyl and carboxylate group. An improved hydrophilic polymer is produced by polymerizing a monomer with a persulfate and a hydroperoxide as combined initiators. Another improved hydrophilic polymer is prepared by polymerizing a monomer with a persulfate and adding a hydroperoxide to the resulting polymer.

대표청구항 ▼

A process for producing a highly water absorbent polymer, which comprises: polymerizing a hydrophilic, carboxylic acid monomer or salt thereof, which monomer is dissolved in water, to obtain a hydrous hydrophilic polymer; then dehydrating said hydrous hydrophilic polymer until the water content ther

A process for producing a highly water absorbent polymer, which comprises: polymerizing a hydrophilic, carboxylic acid monomer or salt thereof, which monomer is dissolved in water, to obtain a hydrous hydrophilic polymer; then dehydrating said hydrous hydrophilic polymer until the water content thereof is from 10 to 40 wt.%, based on the total amount of said hydrous hydrophilic polymer, then adding to said hydrous hydrophilic polymer an effective amount of a crosslinking agent having at least two functional groups in the molecule, which functional groups are capable of reacting with carboxyl and carboxylate groups, and effecting crosslinking of said hydrous hydrophilic polymer.