Superabsorbent acrylic powders having low residual monomer conte

Details Superabsorbent acrylic powders having low residual monomer conte Superabsorbent acrylic powders having low residual monomer conte

1993-08-12

1994-12-13

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...

5253297, C08F 806

Patent

active

053730666

ABSTRACT:
Particulates of a superabsorbent partially, neutralized acrylic polymer, e.g., polyacrylic acid, having a mean particle size ranging from 100 to 500 .mu.m, essentially monodisperse and essentially devoid of fines having a particle size of less than 100 .mu.m, having a nonuniformly surfaced spheroidal particle morphology and containing less than 50 ppm of residual monomer, well suited for a variety of hygienic applications, are prepared by (i) polymerizing a suspension of an acrylic monomer charge I in an organic medium and producing a suspension of acrylic polymer gel particles, (ii) next absorbing a second acrylic monomer charge II into the gel particles, (iii) polymerizing in the gel particles the second acrylic monomer charge II, (iv) azeotropically dehydrating the acrylic polymer particulates thus obtained, (v) then treating the dehydrated particulates with hydrogen peroxide, and (vi) drying the superabsorbent particulates thus treated.

REFERENCES:
patent: 4745154 (1988-05-01), Ruffner
patent: 4783510 (1988-11-01), Saotome
patent: 4959061 (1990-09-01), Cabestany
Chemical Abstracts, vol. 111, No. 18, Oct. 30, 1989, Columbus, Ohio; abstract No. 155076, Manufacture of Water-Absorbents Containing Low Residual Monomers, p. 50, col. 2 & JP-A-01 103 644 (Sanyo Chem. Ind. Ltd.).

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