초록 ▼

A method for the production of a water-absorbent agent comprises mixing an absorbent resin containing a carboxyl group with an additive soluble in the aqueous solution of at least one member selected from the group consisting of inorganic acids, organic acids, and polyamino acids and a cross-linking

A method for the production of a water-absorbent agent comprises mixing an absorbent resin containing a carboxyl group with an additive soluble in the aqueous solution of at least one member selected from the group consisting of inorganic acids, organic acids, and polyamino acids and a cross-linking agent capable of reacting with the carboxyl group. A water-absorbent agent obtained by adding from 0.005 to 8 parts by weight of an epoxy compound to 100 parts by weight of a water-absorbent resin, exhibiting an absorption capacity without load of at least 45 (g/g), an absorption capacity under load of 20 g/cm2 of not less than 30 (ml/g) and having a residue amount of an epoxy compound of not more than 2 ppm. A water-absorbent composition comprises a polyamino acid (salt) and a water-absorbent resin containing a carboxyl group.

대표청구항 ▼

What is claimed is: 1. A water-absorbent resin powder composition comprising a water-absorbent resin having a cross-linked structure obtained by polymerizing a hydrophilic monomer containing acrylic acid and/or salts thereof as a main component, wherein said water-absorbent powder composition conta

What is claimed is: 1. A water-absorbent resin powder composition comprising a water-absorbent resin having a cross-linked structure obtained by polymerizing a hydrophilic monomer containing acrylic acid and/or salts thereof as a main component, wherein said water-absorbent powder composition contains a polyamino acid (salt) and a water-absorbent resin having a carboxyl group, and a surface area of said water-absorbent resin is cross-linked with a cross-linking agent capable of reacting with carboxyl groups. 2. A composition according to claim 1, wherein the ratio of said polyamino acid (salt) is from 0.01 to 30 parts by weight to 100 parts by weight of said water-absorbent resin. 3. A composition according to claim 2, wherein said polyamino acid (salt) is at least one member selected from the group consisting of polyaspartic acid (salt), polyglutamic acid (salt), and polylysine (salt). 4. A water-absorbent resin powder composition comprising a water-absorbent resin having a cross-linked structure obtained by polymerizing a hydrophilic monomer containing acrylic acid and/or salts thereof as a main component, wherein a surface of said water-absorbent resin powder is cross-linked with a cross-linking agent capable of reacting with carboxylic groups, said water-absorbent composition exhibits an absorption capacity without load of at least 25 g/g to physiological saline solution (0.9% by weight of aqueous sodium chloride solution) for 60 minutes, a suction power of not less than 14 g/g to physiological saline solution for 10 minutes and a suction power of at least 7 g/g to bovine blood for 10 minutes, and wherein said water-absorbent resin contains a polyamino acid (salt) and is a powder having an average particle diameter of 200-600 μm and includes not more than 10% by weight of a fraction of less than 150 μm in diameter. 5. A water-absorbent resin powder composition according to claim 1, wherein said water-absorbent resin has an average particle diameter of 200-600 μm and includes not more than 10% by weight of a fraction of less than 150 μm in diameter. 6. A water-absorbent resin powder composition according to claim 1, wherein the absorption capacity under load of 20 g/cm2 (about 1.9 kPa) for 30 minutes is at least 30 ml/g to physiological saline (0.9% by weight of aqueous sodium chloride solution). 7. A water-absorbent resin powder composition according to claim 4, wherein the absorption capacity under load of 20 g/cm2 (about 1.9 kPa) for 30 minutes is at least 30 ml/g to physiological saline (0.9% by weight of aqueous sodium chloride solution). 8. A water-absorbent resin powder composition according to claim 4, wherein an absorption capacity without load of said composition is at least 40 g/g. 9. A water-absorbent resin powder composition according to claim 4, wherein a suction power to bovine blood of said composition for 10 minutes is at least 10.3 g/g. 10. A water-absorbent resin powder composition according to claim 1, wherein said water-absorbent resin powder composition exhibits an absorption capacity without load of an least 25 g/g to physiological saline solution (0.9% by weight of aqueous sodium chloride solution) for 60 minutes, a suction power of not less than 14 g/g to physiological saline solution for 10 minutes and a suction power of at lest 7 g/g to bovine blood for 10 minutes. 11. A water-absorbent resin powder composition according to claim 1, wherein said surface cross-linking is carried out by adding from 0.005 to 8parts by weight of an epoxy compound to 100 parts by weight of water-absorbent resin powder, said powder composition having a residue amount of an epoxy compound content of not more than 2 ppm.