Hybrid polyester-fluorocarbon powder coating composition and a method for coating a substrate with such composition
US11053394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2017 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Sep 14, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/3045
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a hybrid polyester-fluorocarbon powder coating composition which is a dry blend of a polyester powder coating composition A and a fluorocarbon powder coating composition B, wherein: —polyester powder coating composition A comprises a first polyester polymer and a curing agent for the first polyester polymer; and —fluorocarbon powder coating composition B comprises a fluorocarbon polymer, a curing agent for the fluorocarbon polymer, and a second polyester polymer and a curing agent for the second polyester polymer; wherein the weight ratio of polyester powder coating composition A and fluorocarbon powder coating composition B is in the range of from 25:75 to 75:25, wherein the first polyester polymer is a carboxyl functional polymer having an acid value in the range from 18 to 70 mg KOH/g polymer and wherein the second polyester polymer is a hydroxyl functional polyester polymer having a hydroxyl value in the range of from 70 to 350 mg KOH/g polymer. The invention further provides to a method for coating a substrate with such hybrid polyester-fluorocarbon powder coating composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.