Thermosetting durable powder coating composition

Patent metadata

Field	Value
Publication number	US-9365740-B2
Application number	US-201214235519-A
Country	US
Kind code	B2
Filing date	Aug 1, 2012
Priority date	Aug 4, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

The invention relates to a thermosetting powder coating composition comprising a first resin and a second resin, the first resin being an acid functional polyester resin with an acid value below 50 mg KOH/g, the second resin being obtainable by reacting hydroxyl functional components and acid functional components, the hydroxyl functional components comprising components containing 2 hydroxyl functional groups per molecule and/or components containing at least 3 hydroxyl functional groups per molecule, the acid functional components comprising components containing 2 acid functional groups per molecule and/or components containing at least 3 acid functional groups per molecule, wherein—more than 90 mol. % of the total of hydroxyl functional components in the second resin originate from neopentyl glycol (NPG), and—from 6 to 11 mol % of the total of hydroxyl functional components and acid functional components in the second resin originating from hydroxyl functional components and/or acid functional components having at least 3 functional groups per molecule.

First claim

The invention claimed is:

1. A thermosetting powder coating composition comprising a first resin and a second resin, the first resin being an acid functional polyester resin with an acid value below 50 mg KOH/g, the second resin being a reaction product of hydroxyl functional components and acid functional components, the hydroxyl functional components comprising components containing 2 hydroxyl functional groups per molecule and/or components containing at least 3 hydroxyl functional groups per molecule, the acid functional components comprising components containing 2 acid functional groups per molecule and/or components containing at least 3 acid functional groups per molecule, wherein
more than 90 mol. % of the total of hydroxyl functional components in the second resin originate from neopentyl glycol (NPG), and
from 6 to 11 mol % of the total of hydroxyl functional components and acid functional components in the second resin originate from hydroxyl functional components and/or acid functional components having at least 3 functional groups per molecule.

2. The thermosetting powder coating composition of claim 1 wherein more than 95 mol. % of the total of hydroxyl functional components in the second resin originate from neopentyl glycol.

3. The thermosetting powder coating composition of claim 1 wherein trimellitic acid or its anhydride (TMA) is the acid functional component containing at least 3 acid functional groups per molecule.

4. The thermosetting powder coating composition of claim 1 wherein the acid functional components containing 2 acid functional groups per molecule are at least one of isophthalic acid (IPA), terephthalic acid (TPA), or adipic acid (AA).

5. The thermosetting powder coating composition of claim 1 wherein the second resin is an acid functional polyester resin having an acid value of at least 60 mg KOH/g.

6. The thermosetting powder coating composition of claim 1 wherein the second resin is an acid functional polyester resin having an acid value in the range of 70 to 110 mg KOH/g.

7. A thermosetting powder coating composition comprising
a first polyester resin with an acid value below 50 mg KOH/g, wherein the first polyester resin is an acid functional polyester resin,
a second polyester resin being a reaction product of hydroxyl functional components and acid functional components, the hydroxyl functional components comprising components containing 2 hydroxyl functional groups per molecule and/or components containing at least 3 hydroxyl functional groups per molecule, the acid functional components comprising components containing 2 acid functional groups per molecule and/or components containing at least 3 acid functional groups per molecule, wherein
more than 90 mol. % of the total of hydroxyl functional components in the second polyester resin originate from neopentyl glycol (NPG), and
from 6 to 11 mol % of the total of hydroxyl functional components and acid functional components in the second polyester resin originate from hydroxyl functional components and/or acid functional components having at least 3 functional groups per molecule

a crosslinker, and
fillers.

8. The powder coating composition of claim 7 wherein the second polyester resin has an acid value of at least 60 mg KOH/g.

9. The powder coating composition of claim 7 , comprising less than 1 wt. % (based on the total weight of the composition) of triglycidylisocyanurate (TGIC).

Assignees

• Hancill Virginie Marcelle Andrée
• Falcone Michele
• Basar Ergin
• Akzo Nobel Coatings Int Bv

Inventors

• Hancill Virginie Marcelle Andrée
• Falcone Michele
• Basar Ergin

Classifications

• C08G63/914

  derived from polycarboxylic acids and polyhydroxy compounds · CPC title

• C08L67/00

  Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers · CPC title

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• C08G63/12 Primary

  derived from polycarboxylic acids and polyhydroxy compounds · CPC title

• C08G63/20

  Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups · CPC title