Method for production of absorbent resin

Details Method for production of absorbent resin Method for production of absorbent resin

1993-12-15

1995-06-06

Lipman, Bernard

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253245, 5253301, 5253306, C08F 814

Patent

active

054224055

ABSTRACT:
A method for the production of an absorbent resin retaining at a high level an absorption capacity without load, one of the basic physical properties of absorbent resin, and excelling in an absorption capacity under load is provided. The production is attained by mixing an absorbent resin as a base polymer possessing a carboxyl group with a first cross-linking agent possessing a solubility parameter (SP value) of not less than 12.5 (cal/cm.sup.3).sup.1/2 and exhibiting reactivity with the carboxyl group and a second cross-linking agent possessing a solubility parameter (SP value) of less than 12.5 (cal/cm.sup.3).sup.1/2 and exhibiting reactivity with the carboxyl group and then subjecting the resultant mixture to a heat treatment at a temperature not less than 160.degree. C.

REFERENCES:
patent: 4061846 (1977-12-01), Gross et al.
patent: 4587308 (1986-05-01), Makita et al.
patent: 4666975 (1987-05-01), Yamasaki et al.
patent: 4880868 (1989-11-01), Le-Khac
patent: 5032628 (1991-07-01), Choi et al.
patent: 5055501 (1991-10-01), Moriya et al.
patent: 5164459 (1992-11-01), Kimura et al.

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