Hydrophobic self-cleaning coating compositions
US8147607B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2009 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Oct 22, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Coating compositions of the present invention comprise hydrophobic particles, an alcohol, a solvent, and an effective amount of water such that coatings formed therefrom are hydrophobic. The hydrophobic particles may comprise a metal oxide, such as silica (SiO2), alumina (Al2O3), titania (TiO2), or zinc oxide (ZnO), or combinations thereof. In one embodiment, the hydrophobic particles comprise fumed silica. The amount of hydrophobic particles is in the range of from about 0.3 wt. % to about 2 wt. %. In one embodiment, the effective amount of water is at least about 0.066 wt. %. The ratio of the amount of the solvent to the amount of the alcohol is slightly less than 100, and, in another embodiment, is at least about 50 to 50. A surface treated with the composition is characterized by a water contact angle of 115° or more, and more particularly 135° or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.