Powder coating composition comprising an organometallic catalyst

Patent metadata

Field	Value
Publication number	US-11345822-B2
Application number	US-202016807462-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Mar 3, 2020
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

The present invention is directed to a powder coating composition including a hydroxy-functional polymer, a carbodiimide crosslinker, and an organometallic catalyst. The present invention is also directed to a substrate at least partially coated with the powder coating composition. The present invention is also directed to a method of applying a coating composition to a substrate including: applying the powder coating composition to a substrate and heating the powder coating composition to form a coating over the substrate.

First claim

The invention claimed is:

1. A powder coating composition, comprising:
a hydroxy-functional polymer;
a carbodiimide crosslinker; and
an organometallic catalyst;
wherein the powder coating composition is substantially free of blocked isocyanate having a deblocking temperature below 200° C.

2. The powder coating composition of claim 1 , wherein the organometallic catalyst comprises bismuth, tin, titanium, zinc, and/or zirconium.

3. The powder coating composition of claim 1 , wherein the organometallic catalyst comprises a 2+ metal, a 3+ metal, a 4+ metal, and/or a 5+ metal.

4. The powder coating composition of claim 3 , wherein the organometallic catalyst comprises a 2+ metal and/or 4+ metal, wherein the 2+ metal and/or 4+ metal comprises zinc and/or tin.

5. The powder coating composition of claim 1 , wherein the organometallic catalyst comprises dibutyltin dilaurate, zinc (II) octoate, and/or a zinc carboxylate.

6. The powder coating composition of claim 1 , wherein the powder coating composition gels at a temperature of from 130° C. to 200° C.

7. The powder coating composition of claim 1 , wherein the powder coating composition has a gel time at a temperature less than a gel time of the same powder coating composition not including the organometallic catalyst at the same temperature.

8. The powder coating composition of claim 1 , wherein the powder coating composition has a gel time of less than 5 minutes at 180° C.

9. The powder coating composition of claim 1 , wherein the hydroxy-functional polymer has a hydroxyl value of at least 10.

10. The powder coating composition of claim 1 , wherein the organometallic catalyst comprises a Lewis acid.

11. The powder coating composition of claim 1 , wherein the powder coating composition is free of blocked isocyanate having a deblocking temperature below 200° C.

12. The powder coating composition of claim 1 , wherein the hydroxy-functional polymer comprises a hydroxy-functional polyester.

13. The powder coating composition of claim 1 , further comprising a thermoplastic polymer.

14. A substrate at least partially coated with a coating formed from the powder coating composition of claim 1 .

15. The substrate of claim 14 , wherein the substrate comprises metal.

16. The substrate of claim 14 , wherein the substrate comprises an automotive component, an industrial component, an appliance, and/or a package.

17. A method of applying a coating composition to a substrate, comprising:
applying the powder coating composition of claim 1 to a substrate; and
heating the powder coating composition to form a coating over the substrate.

18. The method of claim 17 , wherein heating the powder coating composition, comprises:
heating the applied powder coating composition to a temperature of up to 200° C. to cause the powder coating composition to gel in a time of less than 5 minutes.

19. The method of claim 17 , wherein the powder coating composition gels at a temperature of from 130° C. to 200° C.

20. The method of claim 17 , wherein the organometallic catalyst comprises bismuth, tin, titanium, zinc, and/or zirconium.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Zhou Hongying
• Dei Daniel K
• Millero Jr Edward R
• Shaffer Kathryn A
• Woodworth Brian E

Classifications

• C08G18/4208

  containing aromatic groups · CPC title

• B05D1/06

  Applying particulate materials · CPC title

• C08G18/242

  organometallic compounds containing tin-carbon bonds · CPC title

• C08G18/025 Primary

  the polymeric products containing carbodiimide groups · CPC title

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title