Process for the production of water-absorbing polymer material w

Details Process for the production of water-absorbing polymer material w Process for the production of water-absorbing polymer material w

1991-09-17

1993-11-23

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524 36, 524 43, 524 44, 524 54, 524 55, 524 56, C08L 100, C08L 108

Patent

active

052644715

ABSTRACT:
The invention relates to a process for the production of absorbers for water, aqueous solutions and body liquids, the absorbers consisting of at least two components A and B, whereby component A is at least a water-swellable synthetic polymer or copolymer, and component B is at least a natural or synthetic compound being present at normal temperature as a pourable powder which is highly or at least partially soluble, in water, or as a liquid. The present invention is characterized by the fact that component B is added in the form of a powder, a liquid or as a solution to component A during the end phase of the production process thereof after a polymer reaction degree of 90%, preferably 95% is attained, that is is mixed with the polymer gel of component A and, in order to obtain a powdery, pourable end product, is dried, if necessary, and ground. The invention further relates to the use of said absorbers for the absorption and/or retention of water and/or aqueous solutions and for the subsequent controlled release of water and the substances contained in the swollen polymer gel and soluble in the aqueous medium (component B) to other bodies, preferably to plants, as nutrients for various cultures, and in the controlled dosage of nutrients and drugs.

REFERENCES:
patent: 4058124 (1977-11-01), Yen et al.
patent: 4110431 (1978-08-01), Otia
patent: 4116899 (1978-09-01), Fanta et al.
patent: 4666975 (1987-05-01), Yamasaki et al.
European Search Report (Jan. 31, 1992).
Chemical Abstracts, vol. 103, No. 25, Dec. 23, 1985: 214126q.

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