Coating composition
US4137208A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1977 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | May 4, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D7/42
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Pigmented coating compositions having improved opacity and film strength comprise an aqueous latex of film-forming resin binder, a non-solvent for the resin binder of sufficiently low volatility to produce, upon first removing water from a film of the coating composition and secondly removing said non-solvent, a continuous non-porous microcellular film having minute discrete substantially closed voids, non-film-forming granules of a polymer which is not dissolved by the non-solvent, and pigment and/or extender, which may be present in the latex or the non-solvent or the polymer granules. The polymer granules may be spheroidal beads or aggregates. The non-solvent and the polymer granules alleged to act synergistically to improve the opacity of the paint.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.