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

1982-10-25

1985-11-12

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

524547, 524812, 524832, C08F22006

Patent

active

045529388

ABSTRACT:
A process is disclosed 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 et al.
patent: 4071650 (1978-01-01), Gross
patent: 4093776 (1978-06-01), Aoki et al.
patent: 4154910 (1979-05-01), Tanaka et al.
patent: 4167464 (1979-09-01), George
patent: 4486489 (1984-12-01), George

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