Soil-repellent coating composition
US4600735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1985 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | Feb 15, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D129/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A soil-repellent coating composition comprising silica, polyvinyl alcohol and a wetting agent in an aqueous carrier medium. The composition is characterized in that it, in addition to the aqueous carrier medium, contains 0.5-30% by weight of silica and 0.01-6% by weight of polyvinyl alcohol, and 0.05-2.5% by weight of a wetting agent, based on the total weight of the composition. The ready-made coating composition comprises 0.05-5% by weight of silica, 0.05-0.5% by weight of polyvinyl alcohol and 0.05-0.5% by weight of the wetting agent. The silica is present in the form of an alkali stabilized, preferably ammonium stabilized silica sol with an average particle size of 4-30 nm. The polyvinyl alcohol preferably has a hydrolysis degree of 85-100% and an average molecular weight of 15,000-100,000. The weight ratio of silica to polyvinyl alcohol is above 3:1 and preferably from 5:1 to 40:1. The wetting agent preferably is nonionic. The aqueous carrier medium of the composition may comprise a water-miscible, low-boiling solvent such as ethanol in an amount of up to 20% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.