Water-absorbing polymer particles delaying the decomposition...

Details Water-absorbing polymer particles delaying the decomposition... Water-absorbing polymer particles delaying the decomposition...

2003-04-23

2009-12-01

Sanders, Kriellion A (Department: 1796)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S403000

Reexamination Certificate

active

07625957

ABSTRACT:
Water-absorbing, antimicrobial polymer particles comprising from about 1 to about 500 ppm, based on the particles, of a silver ion based on a silver salt, wherein the silver salt has a solubility product of at least about 1×10−8(mol/l)m+n; at least about 10 wt. %, based on the polymer particle, of a water-absorbing polymer based on: (α1) from about 50 to about 99.99 wt. % polymerized, ethylenically unsaturated, acid groups-containing monomers or salts thereof, (α2) 0 to about 40 wt. % polymerized, mono-ethylenically unsaturated monomers polymerizable with α1, (α3) from about 0.01 to about 5 wt. %, preferably from about 0.1 to about 3 wt. % of one or more crosslinkers, (α4) 0 to about 30 wt. % of a water soluble polymer and (α5) 0 to about 20 wt. % of auxiliaries, the concentration of the silver ion based on a silver salt in at most about 90 vol. % of the particles is less than about 0.01 ppm.

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International Preliminary Examination Report (IPER) mailed on Dec. 9, 2004 in PCT/EP2003/004203.

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