Process for preparing porous and water-absorbent resin

Details Process for preparing porous and water-absorbent resin Process for preparing porous and water-absorbent resin

1991-03-27

1993-05-11

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 71, 526 80, 526207, 526240, 5263171, C08F 218, C08L 3302

Patent

active

052101592

ABSTRACT:
A process for preparing a porous and water-absorbent resin which includes dispersing an aqueous solution containing at least one .alpha.,.beta.-unsaturated carboxylic acid monomer, its alkali metal salt or its ammonium salt in a hydrophobic organic solvent, and conducting a reversed phase suspension polymerization by using a water-soluble radical polymerization initiator, while distilling away the hydrophobic organic solvent together with water. A porous and water-absorbent resin having excellent absorbency and a remarkably improved rate of water absorption can be easily and efficiently obtained on an industrial scale.

REFERENCES:
patent: 4037040 (1977-07-01), Trapasso
patent: 4135043 (1979-01-01), Kast
patent: 4497930 (1985-02-01), Yamasaki
patent: 4727097 (1988-02-01), Kobayashi
patent: 4806578 (1989-02-01), Kobayashi
patent: 4880886 (1989-11-01), Kondo

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