Method for preparing water absorbent resin

Details Method for preparing water absorbent resin Method for preparing water absorbent resin

1997-12-22

1999-03-23

Smith, Jeffery I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 63, 5263171, C08F22238, C08F22006

Patent

active

058861203

ABSTRACT:
A method for producing a water absorbent resin by polymerizing a water-soluble monomer having a polymerizable unsaturated group (A) and a crosslinking agent (B) as the essential components by radical polymerization in the presence of water or, polymerizing a water-soluble monomer having an unsaturated group (A) and a crosslinking agent (B) by radical-graft copolymerization with a water-soluble polymer (C) as the backbone polymer in the presence of water, wherein a water-based solid material capable of being endothermally fused or dissolved into water (D) is added when initiating the polymerization, with at least a part of the water-based solid material (D) in a solid state. By the method of the present invention, a water absorbent resin having a high molecular weight and a high absorption capacity with little water-soluble component can be obtained with ease.

REFERENCES:
patent: 4857610 (1989-08-01), Chmelir et al.
patent: 5385983 (1995-01-01), Graham
patent: 5506324 (1996-04-01), Gartner et al.
patent: 5728792 (1998-03-01), Tanaka et al.

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