High-concentration aqueous dispersions comprising...

Details High-concentration aqueous dispersions comprising... High-concentration aqueous dispersions comprising...

2003-06-06

2008-07-15

Richter, Johann (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

C424S490000, C424S641000

Reexamination Certificate

active

07399487

ABSTRACT:
Aqueous dispersions comprising microfine metal oxide particles and dispersion auxiliaries, wherein, as dispersion auxiliaries, at least one of the compounds of the general formula (I)in whichM is hydrogen, monovalent or divalent metal cation, ammonium ion, organic amine radical;a is 1, or where M is a divalent metal cation, is ½;X is likewise —OMaor —O—(CpH2pO)q—Rlwhere R1═H, aliphatic hydrocarbon radical having 1-20 carbon atoms, cycloaliphatic hydrocarbon radical having 5 to 8 carbon atoms, optionally substituted aryl radical having 6 to 14 carbon atoms, p=2 to 4, q=0 to 100, —NHR2and/or —NR22where R2═R1or —CO—NH2;Y is O, NR2;A1is ethylene radical, propylene radical, isopropylene radical, butylene radical;m is 10 to 30;n is 0 to 50; andk is 10 to 30, where the summ+k is in the range from 20 to 60, is co-used.

REFERENCES:
patent: 4138477 (1979-02-01), Gaffar
patent: 3941543 (1989-12-01), None
patent: 2206339 (1989-01-01), None
patent: WO 90/06103 (1990-06-01), None

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