Process for preparing dry solid water absorbing polyacrylate res

Details Process for preparing dry solid water absorbing polyacrylate res Process for preparing dry solid water absorbing polyacrylate res

1987-02-19

1987-10-27

Michl, Paul R.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

4273855, 521149, C08F22006

Patent

active

047030674

ABSTRACT:
A process for preparing a solid, water absorbing, cross-linked polyacrylate resin including combining potassium acrylate and a polyvinyl monomer, such as N,N-methylene bisacrylamide, with water in an amount of 55 to 80 combined weight percent of potassium acrylate and polyvinyl monomer based on the total weight of potassium acrylate, polyvinyl monomer and water to form a monomer mixture, and adding a polymerization initiator to the monomer mixture to initiate polymerization of the monomer mixture. The monomer mixture then is polymerized without external heating by utilizing the exothermic heat of reaction as substantially the only non-ambient energy source to drive water away from said polyacrylate resin to form the cross-linked polyacrylate resin having a water content sufficiently low (i.e. 15% or less) to be powdered, such as by pulverization, without an intermediate drying step.

REFERENCES:
patent: 2956046 (1960-10-01), Glavis
patent: 4071650 (1978-01-01), Gross
patent: 4093776 (1978-06-01), Aoki
patent: 4154910 (1979-05-01), Tanaka
patent: 4167464 (1979-09-01), George
patent: 4486489 (1984-12-01), George

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