Water absorbent matter and method for producing it as well as water absorbent and method for producing it

A water absorbent matter comprising a mat or wed of cellulose fibers which contains water-absorbent resin particles and a cationic high-molecular compound, and having a density of from about 0.01 to 0.50 g/cm.sup.3,

• said water-absorbent resin particles being composed of a crosslinked polymer, having an acidic group on the surface, being contained among said cellulose fibers, and being crosslinked at a part of said acidic group on the surface of the particles by a crosslinking agent having two or more of a functional group capable of a covalent bond by reacting with said acidic group, and
• said cationic high-molecular compound having a weight-average molecular weight of 2,000 or more,
• wherein falling off of said water absorbent resin particles from said mat or web of said cellulose fibers in the presence of water is decreased by said cationic high-molecular compound.

A method for producing a water absorbent matter comprising:

• mixing, in a gas phase, materials for a water absorbent matter which consists essentially of water-absorbent resin particles composed of crosslinked polymer and having an acidic group on the surface, cellulose fibers, and a cationic high-molecular compound having a weight-average molecular weight of 2,000 or more;
• and
• pneumatically molding the mixture thus-obtained to form a water absorbent matter comprising a mat or web of said cellulose fibers which contains said water-absorbent resin particles and said cationic high-molecular compound and having a density of from about 0.01 to 0.50 g/cm.sup.3, said water-absorbent resin particles being contained among said cellulose fibers, wherein falling off of said water absorbent resin particles from said mat or web of said cellulose fibers in the presence of water is decreased by said cationic high-molecular compound.

A method for producing a water absorbent comprising, treating the surface of water-absorbent resin particles, which comprise a crosslinked polymer and have an acidic group on the surface, with a crosslinking agent having two or more of a functional group capable of a covalent bond by reacting with said acidic group in order to carry out crosslinking by a part of said acidic group, then mixing the particles with a cationic high-molecular compound having a weight-average molecular weight of 2000 or more, which is capable of making an ionic bond through reaction with the acidic group.

A water absorbent comprising a water-absorbent crosslinked polymer and a polyamidopolyamine epihalohydrine resin.

A method for producing a water absorbent comprising mixing a polyamidopolyamine epihalohydrine resin with a water-absorbent crosslinked polymer.