Process for the continuous production of superabsorbent polymers

Details Process for the continuous production of superabsorbent polymers Process for the continuous production of superabsorbent polymers

1996-12-20

1998-03-17

Zemel, Irina S.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525198, 5253291, 5253292, 5253293, 525368, 525369, 521 31, C08F 812, C08F22056, C08F22044

Patent

active

057287740

ABSTRACT:
A process for the continuous production of superabsorbent polymers, characterised in that aqueous emulsions of uncross-linked and cross-linked polyacrylonitrile homopolymers and/or copolymers, the polyacrylonitrile concentrations in the reaction mixture being from 10 to 45 w.t. %, are hydrolysed with aqueous alkali hydroxide solutions at 50.degree. to 100.degree. C. in a continuously operating reactor suitable for carrying out highly viscous reactions, and that from the highly viscous gels formed the products in the form of superabsorbent powders are continuously precipitated by means of continuous precipitation using low-boiling monoalcohols, and the use thereof in sanitary articles, as water-storing materials in agriculture or for sheathing electrical cables.

REFERENCES:
patent: 5175193 (1992-12-01), Heller et al.
patent: 5369132 (1994-11-01), Ito et al.
patent: 5496980 (1996-03-01), Sackmann et al.

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