Fumed silica dispersion
Dispersion of fumed silica comprising a silanized, structurally modified silica and a solvent. It is used for producing coating materials.
1. Dispersion of fumed silica, comprising a silanized, structurally modified fumed silica and a solvent, wherein the fumed silica has the following size distribution:
20% to 98% by weight in the range from 0.01 μm to 1.5 μm
2% to 80% by weight in the range from 1.5 μm to 4.0 μm.
2. Dispersion of fumed silica according to claim 1 , further comprising one or more additives.
3. Process for producing solventborne coating materials, comprising mixing the dispersion according to claim 1 with at least one binder.
4. Process according to claim 3 , further comprising adding at least one curing agent.
5. Dispersion of fumed silica according to claim 1 , wherein the fumed silica is present in the amount of 5% to 70% by weight of the dispersion.
6. Dispersion of fumed silica according to claim 1 , wherein the silanized, structurally modified fumed silica has a surface with dimethylsilyl and/or monoethylsilyl groups attached thereto.
7. Dispersion of fumed silica according to claim 1 , wherein the fumed silica is further characterized by:
BET surface area
25-400
Average primary particle size nm
5-50
pH:
3-10
Carbon content % by weight
0.1-10
DBP value %
<200.
8. Dispersion of fumed silica according to claim 1 , wherein the fumed silica has the following size distribution:
60% to 95% by weight in the range from 0.2 μm to 1.5 μm
5% to 40% by weight in the range from 1.5 μm to 3.5 μm.
9. Dispersion of fumed silica according to claim 1 , wherein the solvent is an organic solvent.
10. Non-water soluble coating composition comprising the dispersion according to claim 1 and at least one curing agent and/or at least one binder.
11. A clear coat material comprising the dispersion according to claim 1 .