Process for preparing highly water-absorbent resin

Details Process for preparing highly water-absorbent resin Process for preparing highly water-absorbent resin

1985-09-11

1987-03-03

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526210, 526306, 5263171, C08F 232

Patent

active

046476369

ABSTRACT:
A process for preparing a highly water-absorbent resin by a reversed-phase suspension polymerization method using an aqueous solution of a monomer containing an alkali metal salt of acrylic or methacrylic acid, water-soluble polymerization initiator, protective colloid, hydrophobic organic solvent and if required, dispersing agent, the process being characterized in that the protective colloid is a copolymer comprising:
(A) about 50 to about 97 mole % of styrene and/or alkyl-substituted derivative thereof,
(B) 0 to about 50 mole % of dialkylaminoalkyl acrylate or methacrylate and/or dialkylaminoalkyl acrylamide or methacrylamide,
(C) about 3 to about 15 mole % of glycidyl acrylate and/or glycidyl methacrylate and
(D) 0 to about 30 mole % of an unsaturated monomer which can be copolymerized with the component A, B or C.

REFERENCES:
patent: 3948866 (1976-04-01), Pennewiss
patent: 4500649 (1985-02-01), Tanaka

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