Silicone-based electrodepositable coating composition

Patent metadata

Field	Value
Publication number	US-11466175-B2
Application number	US-201916730228-A
Country	US
Kind code	B2
Filing date	Dec 30, 2019
Priority date	Dec 30, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present invention is directed towards an electrodepositable coating composition comprising, consisting essentially of, or consisting of an ionic salt group-containing silicone-based main film-forming polymer comprising functional groups; and a curing agent reactive with the functional groups of the ionic salt group-containing silicone-based main film-forming polymer. Also disclosed are coatings, coated substrates, and methods of coating a substrate.

First claim

We claim:

1. An electrodepositable coating composition comprising:
an ionic salt group-containing silicone-based main film-forming polymer comprising functional groups, wherein the ionic salt group-containing silicone-based main film-forming polymer comprises active hydrogen functional groups; and
a silicone-based curing agent comprising functional groups reactive with the active hydrogen functional groups of the ionic salt group-containing silicone-based main film-forming polymer.

2. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer comprises a polydialkylsiloxane polymer, a polydiarylsiloxane polymer, or combinations thereof.

3. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer comprises the structure:

wherein each R 1 independently comprises a hydroxyl functional group, an amino functional group, a thiol functional group, an epoxide functional group, an amide functional group, a carbamate functional group, a carboxylic acid group, a phosphorous acid group, a sulfonic acid group, a C 1 to C 4 alkyl group, or an aryl group comprising an aromatic ring having 6 to 12 carbon atoms in the ring; each R 2 is optional and independently comprises oxygen, or a substituted or unsubstituted divalent organic group; each R 3 is optional and independently comprises a divalent organic group; each X independently comprises hydrogen, a hydroxyl functional group, an amino functional group, a thiol functional group, an epoxide functional group, an amide functional group, a carbamate functional group, a carboxylic acid group, a phosphorous acid group, a sulfonic acid group, an alkyl group, or an aryl group; m is an integer from 1 to 600; n is an integer from 1 to 600; and p is an integer from 0 to 600.

4. The electrodepositable coating composition of claim 3 , wherein R 3 comprises:

wherein A is oxygen or NH and R 4 comprises an optional divalent organic group.

5. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer comprises the residue of an epoxy-functionalized silicone-based polymer and an amine-functionalized silicone-based polymer.

6. The electrodepositable coating composition of claim 5 , wherein the epoxy-functionalized silicone-based polymer has a theoretical epoxy equivalent weight of 100 g/epoxy to 3,000 g/epoxy.

7. The electrodepositable coating composition of claim 5 , wherein the amine-functionalized silicone-based polymer has a theoretical amine equivalent weight of 100 g/amine to 2,500 g/amine.

8. The electrodepositable coating composition of claim 5 , wherein ratio of amino functional groups from the amine-functionalized silicone-based polymer to epoxy functional groups from the epoxy-functionalized silicone-based polymer comprises 0.5:1 to 2:1.

9. The electrodepositable coating composition of claim 8 , wherein ratio of amino functional groups from the amine-functionalized silicone-based polymer to epoxy functional groups from the epoxy-functionalized silicone-based polymer comprises 1.2:1 to 1.7:1.

10. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer comprises cationic salt groups.

11. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer comprises an active hydrogen-containing, cationic salt group-containing silicone-based main film-forming polymer.

12. The electrodepositable coating composition of claim 1 , wherein the silicone-based curing agent comprises a silicone-based at least partially blocked polyisocyanate, a silicone-based aminoplast resin, a silicone-based phenoplast resin, or combinations thereof.

13. The electrodepositable coating composition of claim 12 , wherein the silicone-based at least partially blocked polyisocyanate comprises a polydimethylsiloxane-based at least partially blocked polyisocyanate.

14. The electrodepositable coating composition of claim 1 , wherein the silicone-based main film-forming polymer is present in an amount of 40% to 99% by weight, based on the total weight of resin solids of the electrodepositable coating composition.

15. The electrodepositable coating composition of claim 1 , wherein the silicone-based curing agent is present in an amount of 1% to 60% by weight, based on the total weight of resin solids of the electrodepositable coating composition.

16. A method of coating a substrate comprising electrophoretically applying the electrodepositable coating composition of claim 1 to at least a portion of the substrate and at least partially curing the coating composition to form an at least partially cured coating on the substrate.

17. A substrate coated with a coating deposited from the electrodepositable coating composition of claim 1 .

18. An at least partially cured coating formed by at least partially curing a coating deposited from the electrodepositable coating composition of claim 1 .

Assignees

• Ppg Ind Ohio Inc

Inventors

• Stone David A
• Love Jonathan A
• Sample Casey

Classifications

• C09D183/08

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• C09D183/12 Primary

  containing polyether sequences · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C25D13/04

  with organic material · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title