Superabsorbent polymers from cross-linked polyacrylonitrile emul

Details Superabsorbent polymers from cross-linked polyacrylonitrile emul Superabsorbent polymers from cross-linked polyacrylonitrile emul

1995-08-09

1997-06-03

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...

5253291, 5253292, 5253293, 525369, C08F 812

Patent

active

056355696

ABSTRACT:
Superabsorbent polymers based on partly hydrolysed homopolymers and/or copolymers of acrylonitrile which are cross-linked through the incorporation of polyfunctional monomers, wherein 30 to 80 mol-% of the nitrile groups are converted into carboxylate groups, 20 to 70 mol-% of the nitrile groups are converted into carbonamide groups and 0 mol-% to 20 mol-% of the nitrile groups are unchanged, and the said cross-linked polymers possess a swelling capacity of 700 g/g in water and of up to 60 g/g in physiological saline and a gel strength of from 20 g to 100 g, their preparation and their use.

REFERENCES:
patent: 3929740 (1975-12-01), Engelhardt et al.
patent: 4357437 (1982-11-01), Huhn et al.
patent: 5175193 (1992-12-01), Heller et al.
patent: 5356985 (1994-10-01), Sackmann et al.

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