Super-absorbent polymers

Details Super-absorbent polymers Super-absorbent polymers

1995-10-20

1996-10-22

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...

5253292, 5253293, 525362, 525368, 525369, C08F 812

Patent

active

055677797

ABSTRACT:
A process for the production of super-absorbent polymers with a swelling capacity in water-containing liquids of up to 1,000 g/g in which aqueous emulsions of particularly high molecular weight polymers of acrylonitrile are partly hydrolyzed by reaction with aqueous solutions of alkali metal and/or alkaline earth metal hydroxides, the polymers are precipitated in powder form by addition of water-miscible organic solvents, separated off, dried and then optionally heated for a short time. The super-absorbent polymers are used as water-storing materials, for example in sanitary articles, in agriculture or in the sheathing of electrical cables.

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patent: 3929740 (1975-12-01), Engelhardt et al.
patent: 4228056 (1980-10-01), Stoy
patent: 4357437 (1982-11-01), Huhn et al.
patent: 4795762 (1989-01-01), Diamantoglou et al.
patent: 4943618 (1990-07-01), Stoy et al.
patent: 5252692 (1993-10-01), Lory et al.

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