Cross-linked, water-swellable polymer and method for...

Details Cross-linked, water-swellable polymer and method for... Cross-linked, water-swellable polymer and method for...

2008-07-01

2008-07-01

Egwim, Kelechi C (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S303100, C526S307400, C526S307500, C526S320000, C526S323100, C526S323200

Reexamination Certificate

active

10399185

ABSTRACT:
The invention relates to a cross-linked, water-swellable polymer that contains polymerized into it moieties ofa) water-soluble, monoethylenically unsaturated monomers, andb) 0.001 to 5 mole % based on the monomers a) of a cross-linking combination,b1) a frist cross-linking agent with at least two (meth)acrylic ester moieties in the molecule andb2) a second cross-linking agent with at least two (meth)allyloxy moieties in the molecule,the molar ratio of b1) to b2) ranging from 0.7:1 to 10:1.The polymer according to the invention has a balanced property profile as regards absorptivity, gel strength, absorption speed and extractable componenents and can be advantageously produced by a continuous method.

REFERENCES:
patent: 4536554 (1985-08-01), Lim et al.
patent: 4769427 (1988-09-01), Nowakowsky et al.
patent: 5837789 (1998-11-01), Stockhausen et al.
patent: 6143821 (2000-11-01), Houben
patent: 199 55 861.2 (1999-11-01), None
patent: WO 90/15830 (1990-12-01), None
patent: WO 9015830 (1990-12-01), None

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