Curable coating composition with improved stability
US6391973B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Jul 24, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F291/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a coating composition containing a two-stage polymer emulsion. The two-stage emulsion polymer contains composite polymeric particles of a first stage polymer prepared from about 0.25% to about 5% by weight monomer having at least two polymerizable ethylenically unsaturated groups, about 2.5% to about 10% by weight hydroxyl monomer, preferably at least about 50% by weight of non-functional monomer of hydrophobic monomer, and preferably without addition of any acid-functional monomer; and a second stage polymer having a theoretical glass transition temperature of at least about 50° C. prepared using, by weight, about 25% to about 50% by weight hydroxyl monomer, about 3% to about 9% carboxylic acid monomer, and preferably at least 25% by weight of non-functional monomer of hydrophobic monomer;. The composite polymeric particles have a theoretical glass transition temperature of not more than about 30° C., preferably not more than about 0° C., and include from about 0.8% to about 2% by weight of carboxylic acid monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.