Cross-linked, water-absorbing polymer and its use in the product

Details Cross-linked, water-absorbing polymer and its use in the product Cross-linked, water-absorbing polymer and its use in the product

1994-02-01

1995-04-18

Nagumo, Mark

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526287, 526371, 526310, 526312, 526220, C08F23622, C08F23670

Patent

active

054080193

ABSTRACT:
The invention relates to a cross-linked, water-absorbent polymer obtainable by the polymerization of a mixture consisting of a) 60-99%-wt. unsaturated, polymerizable monomers with acid groups which are neutralized to the extent of at least 30 mol-%, b) 0-37%-wt. monomers copolymerizable with a), c) 0.1-3.0%-wt. of a cross-linking agent and d) 0-10%-wt. of a water-soluble polymer, in which polymerization is conducted with a redox catalyst system containing formamidine sulfinic acid as reducing agent. The polymer is distinguished by a retention of greater than or equal to 28 g 0.9% aqueous NaCl-solution per 1 g of polymer, an absorption of greater than or equal to 26 g 0.9% aqueous NaCl-solution per 1 g of polymer at a load of 20 g/cm.sup.2 and a residual monomer content of less than 700 ppm, and preferably less than 500 ppm. The invention also relates to the use of this polymer in the production of hygiene articles.

REFERENCES:
patent: Re32649 (1988-04-01), Brandt et al.
patent: 4286082 (1981-08-01), Tsubakimoto et al.
patent: 4833222 (1989-05-01), Siddal et al.
patent: 4914170 (1990-04-01), Chang et al.
patent: 5106929 (1992-04-01), Ahmed et al.
"Houben-Weyl: Methoden der Organischen Chemie", vol. 14/11, p. 265.

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