Waterborne, UV curable coating composition for easy-clean coatings

Patent metadata

Field	Value
Publication number	US-11920052-B2
Application number	US-202017629823-A
Country	US
Kind code	B2
Filing date	Jul 29, 2020
Priority date	Aug 1, 2019
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

The present disclosure relates to an aqueous dispersion of a carboxyl-functional, unsaturated polyester containing a perfluoropolyether block prepared by the following steps: a) subjecting a carboxyl-terminated perfluoropolyether C to a reaction with an ethylenically unsaturated epoxy-functional compound D in the presence of compound E, wherein compound E is a carboxylic acid or anhydride with functionality of at least 2, to obtain carboxyl-functional, unsaturated polyester F, and b) neutralizing carboxyl-functional, unsaturated polyester F with a neutralizer G and dispersing it in water. The dispersion can be used to prepare a waterborne, UV-curable coating composition and used for easy-clean coatings for various substrates.

First claim

The invention claimed is:

1. An aqueous dispersion of a carboxyl-functional, unsaturated polyester containing a perfluoropolyether block prepared by the following steps:
a) subjecting a carboxyl-terminated perfluoropolyether C to a reaction with an ethylenically unsaturated epoxy-functional compound D in the presence of compound E, wherein compound E is a carboxylic acid or anhydride with functionality of at least 2, to obtain carboxyl-functional, unsaturated polyester F,
b) neutralizing carboxyl-functional, unsaturated polyester F with a neutralizer G and dispersing it in water,
wherein the carboxyl-terminated perfluoropolyether C is prepared by subjecting a hydroxy-terminated perfluoropolyether A to a condensation reaction with compound B, wherein compound B is a multifunctional carboxylic acid or anhydride with a functionality of at least 3.

2. The dispersion according to claim 1 , wherein compound A has a general structure
HO—(CH 2 CH 2 O) p —CH 2 —CF 2 —R f —CF 2 —CH 2 —(OCH 2 CH 2 ) q —OH

wherein p and q are integers independently chosen from 0 to 50, R f represents a bifunctional radical having perfluoropolyether structure (CF 2 CF 2 O) n , (CF 2 O) m or (CF 2 —CF 2 —O) n —(CF 2 —O) m , and wherein n and m are integers independently chosen from 1 to 100.

3. The dispersion according to claim 1 , wherein compound B is an anhydride.

4. The dispersion according to claim 3 , wherein compound B is trimellitic anhydride or hydrogenated trimellitic anhydride.

5. The dispersion according to claim 1 , wherein the carboxyl-terminated perfluoropolyether C has an acid value in the range 10-50 mg KOH/g.

6. The dispersion according to claim 1 , wherein the ethylenically unsaturated epoxy-functional compound D is an epoxy-functional (meth)acrylate.

7. The dispersion according to claim 1 , wherein compound E is an ethylenically unsaturated anhydride.

8. The dispersion according to claim 1 , wherein neutralizer G is a tertiary amine with a (meth)acrylate functionality.

9. A waterborne, UV curable coating composition comprising the aqueous dispersion according to claim 1 .

10. The coating composition according to claim 9 , further comprising at least one (meth)acrylate monomer, oligomer or polymer different from carboxyl-functional, unsaturated polyester F.

11. The coating composition according to claim 9 , further comprising an organic solvent in an amount less than 10 wt. %, based on the total weight of the coating composition.

12. A method of coating a substrate, comprising applying the coating composition according to claim 9 to a substrate and curing the coating composition by means of UV radiation.

13. A coated substrate obtained according to the method of claim 12 .

14. The substrate according to claim 13 , wherein the substrate is selected from the group consisting of polycarbonate acrylonitrile butadiene styrene (PC/ABS), polycarbonate, polyacrylate, polyolefin, polyamide, polystyrene, glass, wood, aluminum, and aluminum alloys.

15. An aqueous dispersion of a carboxyl-functional, unsaturated polyester containing a perfluoropolyether block prepared by the following steps:
a) subjecting a carboxyl-terminated perfluoropolyether C to a reaction with an ethylenically unsaturated epoxy-functional compound D in the presence of compound E, wherein compound E is a carboxylic acid or anhydride with functionality of at least 2, to obtain carboxyl-functional, unsaturated polyester F,
b) neutralizing carboxyl-functional, unsaturated polyester F with a neutralizer G and dispersing it in water,
wherein neutralizer G is a tertiary amine with a (meth)acrylate functionality.

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Wang Jianhui
• Xu Zhenglin
• Lin Hong

Classifications

• C09D171/02 Primary

  Polyalkylene oxides · CPC title

• C08G65/3326

  aromatic · CPC title

• C09D7/20

  Diluents or solvents · CPC title

• C09D167/06 Primary

  Unsaturated polyesters having carbon-to-carbon unsaturation · CPC title

• C08G63/6824 Primary

  derived from polycarboxylic acids and polyhydroxy compounds · CPC title