Water-absorbent resin and production process

Details Water-absorbent resin and production process Water-absorbent resin and production process

1992-12-11

1993-09-14

Schofer, Joseph L.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

5263171, 5263181, C08F12006

Patent

active

052447359

ABSTRACT:
Water-absorbent resins having an average particle diameter of 100 to 600 .mu.m and a particle diameter distribution of 0.35 or less are prepared by polymerizing an aqueous solution of a water-soluble ethylenically unsaturated monomer, pulverizing and sieving the gel-like polymer so obtained, and crosslinking the surface of the polymer powder. In an alternative process, an aqueous solution of the monomer having a viscosity greater than 15 cps is dispersed in a hydrophobic organic solvent and polymerized to obtain a polymer powder, and the surface of the polymer powder is crosslinked.

REFERENCES:
patent: 4682274 (1987-07-01), Nakamura et al.
patent: 4732968 (1988-03-01), Obayashi et al.
patent: 4734478 (1988-03-01), Tsubakimoto et al.
patent: 4764576 (1988-08-01), Ogawa et al.
patent: 4880888 (1989-11-01), Obayashi et al.

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