IP Library › Granted Patent US 6,878,780
Granted Patent B2
US 6,878,780 · App. 10/462,263 · Granted Apr 12, 2005

Acrylic powder coating resin having low volatility

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Quick Facts
Patent No.
US 6,878,780
App. No.
10/462,263
Granted
Apr 12, 2005
Kind
B2
Abstract

Powder coating compositions having reduced volatility and improved processibility compared to conventional powder coatings consist essentially of a copolymer having pendant functionalities or pendant groups capable of reacting with a dicarboxylic acid such as the glycidyl groups of glycidyl acrylate or methacrylate copolymer and a cross-linking effective amount of a dicarboxylic acid. The reaction of the above pendant groups and the dicarboxylic acid cross-links or cures the powder coating after application to a substrate. The dicarboxylic acids according to the invention eliminate the need for a third component which is a flow control agent which improves the processibility of a two-component powder coating. The dicarboxylic acids according to the invention have a sublimation temperature great enough to decrease or prevent their vaporization during the curing of the powder coating and have a melting point low enough to impart improved flow properties to the powder coatings.

Claims (7)

1. A method for imparting room temperature stability and improved flow properties to a powder coating comprising contacting a polymer consisting essentially of a copolymer having a pendant functionality capable of reacting with a dicarboxylic acid and a flow-controlling effective amount of a saturated dicarboxylic acid having from 15 to 18 carbon atoms.

2. The method of claim 1 wherein the dicarboxylic acid is octadecanedioic acid.

3. The method of claim 1 wherein the copolymer is a glycidyl methacrylate or a glycidyl acrylate copolymer.

4. The method of claim 1 wherein the effective amount of the dicarboxylic acid is from about 2% to about 50% by weight.

5. A method for imparting room temperature stability and improved flow properties to a powder coating comprising contacting a polymer consisting essentially of a copolymer having glycidyl pendant functionalities and a temperature stabilizing effective amount of octadecanedioic acid.

6. The method of claim 5 wherein the copolymer is a glycidyl methacrylate or a glycidyl acrylate copolymer.

7. The method of claim 5 wherein the effective amount of the dicarboxylic acid is from about 2% to about 50% by weight.