Copolyester resin for solventborne coating and coating composition comprising the same
US7078476B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2002 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Oct 18, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31855
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a copolyester resin having number average molecular weight over 5,000 for solventborne metal coating binder, which has superior gloss retention and color stability after long term outdoor exposure, and a coating composition comprising the same. The copolyester has excellent weatherability and color stability. The copolyester resin is prepared through the polycondensation of an acid component comprising 60–90 mol % of aromatic dicarboxylic acid selected from the group consisting of isophthalic acid, C1–C2 alkylester of isophthalic acid, phthalic acid, C1–C2 alkylester of phthalic acid, phthalic anhydride, and mixtures thereof, and 10–40 mol % of cycloaliphatic dicarboxylic acid selected from the group consisting of 1,2-cyclohexane dicarboxylic anhydride, 1,2-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,2-cyclohexane dicarboxylic acid, 1,4-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,4-cyclohexane dicarboxylic acid, and mixtures thereof, an alcohol component comprising 60–100 mol % of 2,2-dialkyl-1,3-propandiol and 0–40 mol % of a polyvalent alcohol and 0–5 mol % of a polyvalent alcohol or acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.