High-concentration aqueous dispersions comprising hydrophilic microfine metal oxide particles and dispersion auxiliaries
View Patent ↗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 which M 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 —OM a or —O—(C p H 2p O) q —R l where R 1 ═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, —NHR 2 and/or —NR 2 2 where R 2 ═R 1 or —CO—NH 2 ; Y is O, NR 2 ; A 1 is ethylene radical, propylene radical, isopropylene radical, butylene radical; m is 10 to 30; n is 0 to 50; and k is 10 to 30, where the summ+k is in the range from 20 to 60, is co-used.
1. An aqueous dispersion comprising:
A) uncoated or hydrophilically coated microfine metal oxide particles; and
B) at least one compound of general formula (Ia) or (Ib)
in which
M is hydrogen, a monovalent or divalent metal cation, or an ammonium ion;
a is 1, or where M is a divalent metal cation, a is ½;
X is OM a or —O—(C p H 2p O) q —R 1 where R 1 =H, an aliphatic hydrocarbon radical having 1-20 carbon atoms, a cycloaliphatic hydrocarbon radical having 5 to 8 carbon atoms, an optionally substituted aryl radical having 6 to 14 carbon atoms, p=2to4,q=0 to 100,
—NHR 2 and/or NR 2 2 where R 2 =R 1 or —CO—NH 2 ;
Y is O, or NR 2 ;
A 1 is an ethylene radical, a propylene radical, an isopropylene radical, or a butylene radical;
m is 10 to 30;
n is 0 to 50; and
k is 10 to 30, where the sum
m +k is in the range from 20 to 60.
2. The aqueous dispersion of claim 1 wherein the dispersion comprises 20 to 60% by weight of said microfine metal oxide particles.
3. The aqueous dispersion of claim 1 wherein the microfine metal oxide particles comprise zinc oxide, titanium dioxide or a mixture thereof that are hydrophilically coated with aluminum oxide/glycerol or silica/glycerol.
4. The aqueous dispersion of claim 1 wherein the microfine metal oxide particles comprise uncoated zinc oxide, uncoated titanium dioxide or a mixture thereof.
5. The aqueous dispersion of claim 1 wherein the metal oxide particles have a primary particle size of between 10 and 100 nm.
6. The aqueous dispersion of claim 1 wherein compounds in which A 1 is an ethylene radical, m is 10 to 30, n is 5 to 20, k is 10 to 30 and where the sum m+k is in the range from 20 to 40.
7. The aqueous dispersion of claim 1 wherein the dispersion has a measured viscosity between 10 and 40,000 mPas at room temperature.
8. The aqueous dispersion of claim 1 further comprising cosmetic auxiliaries and cosmetic additives.
9. A cosmetic formulation comprising the aqueous dispersion of claim 1 .