Powdery, cross-linked absorbent polymers method for the production thereof and their use
AssigneeStockhausen GmbH & Co. KG
InventorsRichard Mertens, Jorg Harren
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Abstract
The invention relates to crosslinked polymerizates which are capable of absorbing, which are based on partially neutralized, monoethylenically unsaturated monomers that carry acidic groups, which exhibit improved properties, in particular, with regard to their ability to transport liquids when in a swollen state, and which have been subsequently crosslinked on the surface thereof with a combination consisting of an organic crosslinker compound, with the exception of polyols, and of a cation provided in the form of a salt in an aqueous solution.
Claims22
A powdered polymer product which has been subjected to secondary crosslinking at its surface, and which absorbs water, aqueous or serous fluids, as well as blood, and is constituted of
- a) 55-99.9 wt.-% of polymerized, ethylenically unsaturated monomers which contain acid groups and are neutralized to at least 25 mole-%,
- b) 0-40 wt.-% of polymerized, ethylenically unsaturated monomers copolymerizable with a),
- c) 0.1-5.0 wt.-% of one or more polymerized crosslinkers,
- d) 0-30 wt.-% of a water-soluble polymer,
- the sum of the weight amounts a) through d) being 100 wt.-%, characterized in that the polymer product has been treated with
- e) 0.01-5 wt.-%, relative to the polymer product, of an organic surface secondary crosslinking agent, with the exception of polyols, in the form of an aqueous solution, and
- f) 0.001-1.0 wt.-%, relative to the polymer product, of a cation in the form of an aqueous solution,
- and has been subjected to secondary crosslinking.
Dependencies are inferred from the claim text.