Electrocoating composition including an anti-crater agent

Patent metadata

Field	Value
Publication number	US-10577510-B2
Application number	US-201815940111-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 31, 2017
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

An electrocoating composition is provided herein. The electrocoating composition includes an aqueous carrier. The electrocoating composition further includes a film forming binder. The film forming binder includes an epoxy-amine adduct and a blocked polyisocyanate crosslinking agent. The electrocoating composition further includes an anti-crater agent selected from the group of a polyester resin dispersion, a polyacrylate resin dispersion, and a combination thereof. The electrocoating composition further includes a supplemental anti-crater agent including a polyether modified polysiloxane.

First claim

What is claimed is:

1. An electrocoating composition, comprising:
an aqueous carrier;
a film forming binder comprising an epoxy-amine adduct and a blocked polyisocyanate crosslinking agent;
an anti-crater agent selected from the group consisting of a polyester resin dispersion and a combination of a polyester resin dispersion and a polyacrylate resin dispersion; and
a supplemental anti-crater agent comprising a polyether modified polysiloxane.

2. The electrocoating composition of claim 1 , wherein the polyester resin dispersion is further defined as a highly-branched water-reducible polyester.

3. The electrocoating composition of claim 1 , wherein the polyester resin dispersion comprises the reaction product of:
a hydroxy-functional cyclic carbonate; and
an aliphatic carboxylic acid anhydride.

4. The electrocoating composition of claim 3 , wherein the hydroxy-functional cyclic carbonate comprises glycerin carbonate.

5. The electrocoating composition of claim 3 , wherein the aliphatic carboxylic acid anhydride comprises dodecenylsuccinic anhydride, octadecenylsuccinic anhydride, or a combination thereof.

6. The electrocoating composition of claim 3 , wherein the polyester resin dispersion comprises the reaction product of:
a hydroxy-functional cyclic carbonate;
an aliphatic carboxylic acid anhydride;
a polyfunctional isocyanate compound; and
a polyamine compound.

7. The electrocoating composition of claim 6 , wherein the polyamine compound is selected from the group of:
a polyamine having at least one free tertiary amine and one primary or secondary amine group; and
a combination of a polyamine having at least one free tertiary amine and one primary or secondary amine group, and an aminoalkylalkoxysilane;
wherein the reaction product is neutralized in the presence of acid and water.

8. The electrocoating composition of claim 6 , wherein the polyester resin dispersion comprises the reaction product of:
a hydroxy-functional cyclic carbonate;
an aliphatic carboxylic acid anhydride;
a monofunctional epoxy resin;
a polyfunctional isocyanate compound; and
a polyamine compound selected from the group of;
a polyamine having at least one free tertiary amine and one primary or secondary amine group, and
a combination of a polyamine having at least one free tertiary amine and one primary or secondary amine group, and an aminoalkylalkoxysilane,

wherein the reaction product is neutralized in the presence of acid and water.

9. The electrocoating composition of claim 1 , wherein the polyacrylate resin dispersion is further defined as a water-reducible polyacrylate.

10. The electrocoating composition of claim 8 , comprising a polyacrylate resin dispersion that comprises the reaction product of monomers selected from alkyl(meth)acrylate monomers, hydroxy-functional (meth)acrylate monomers, and amino-functional (meth)acrylate monomers.

11. The electrocoating composition of claim 10 , wherein the alkyl(meth)acrylate monomer comprises butylacrylate.

12. The electrocoating composition of claim 10 , wherein the hydroxy-functional (meth)acrylate monomer comprises hydroxypropyl methacrylate.

13. The electrocoating composition of claim 10 , wherein the amino-functional (meth)acrylate monomer comprises N,N-dimethylaminoethyl methacrylate.

14. The electrocoating composition of claim 1 , wherein the anti-crater agent is utilized in an amount of from about 0.01 to about 10 wt. % based on a total weight percent of the electrocoating composition.

15. The electrocoating composition of claim 1 , wherein the supplemental anti-crater agent is utilized in an amount of from about 0.01 to about 20 wt. % based on a total weight percent of the anti-crater agent utilized in the electrocoating composition.

Assignees

• Axalta Coating Systems Ip Co

Inventors

• Gam Allisa
• Huybrechts Jozef Theresia

Classifications

• C09D5/4476 Primary

  comprising polymerisation in situ · CPC title

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• C25D13/04

  with organic material · CPC title

• C09D5/4457

  containing special additives, e.g. pigments, polymeric particles · CPC title