Aqueous coating composition giving coatings having improved early hardness and tack-resistance
US6828376B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2001 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Apr 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D167/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous coating composition (especially a paint or varnish for buildings, vehicles, furniture and metal or plastics containers) which can form coatings on surfaces at ambient temperatures which on drying have improved early hardness and tack-resistance. The coating composition comprises water, optionally pigment and other conventional ingredients and dispersed particles of a highly non-crystalline polyester containing repeating hydroxyalkanoate units (preferably 3-hydroxybutyrate or 3-hydroxyvalerate or their copolymers). The polyester is non-crystalline to the extent that at least 60 wt % of the particles have a density of less than 102% of Dmin where Dmin is the minimum density attainable by the polyester. The composition may also contain conventional film-forming polymers of the types used in aqueous paint or varnish.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.