Coating compositions exhibiting corrosion resistance properties and related coated substrates

Patent metadata

Field	Value
Publication number	US-2016194501-A1
Application number	US-201615070199-A
Country	US
Kind code	A1
Filing date	Mar 15, 2016
Priority date	Aug 26, 2005
Publication date	Jul 7, 2016
Grant date	—

Abstract

Coating compositions are disclosed that include corrosion resisting particles such that the coating composition can exhibit corrosion resistance properties. Also disclosed are substrates at least partially coated with a coating deposited from such a composition and multi-component composite coatings, wherein at least one coating later is deposited from such a coating composition. Methods and apparatus for making ultrafine solid particles are also disclosed.

First claim

We claim:

1 . A primer and/or pretreatment coating composition comprising:
(a) a thermosetting film-forming resin formed from the reaction of a polyamine with an epoxy functional polymer; and (b) corrosion resisting particles comprising magnesium oxide particles having an average primary particle size of no more than 100 nanometers

2 . The method of claim 1 , wherein the polyamine comprises a polyamide resin.

3 . The method of claim 1 , wherein the composition further comprises an adhesion promoting component comprising at least one of:
(a) tannic acid, gallic acid, phosphoric acid, phosphorous acid, citric acid, malonic acid, a derivative thereof, or a mixture thereof; (b) a metal phosphate; (c) an organophosphate; (d) an organophosphonate; and (e) a phosphatized epoxy resin.

4 . The primer and/or pretreatment coating composition of claim 4 , wherein the adhesion promoting component comprises a free acid and/or a phosphatized epoxy resin.

5 . The method of claim 1 , wherein the composition further comprises a phenolic resin.

6 . The method of claim 23 , wherein the alkoxysilane comprises an epoxy-functional silane.

7 . A substrate comprising aluminum at least partially coated with a primer coating comprising:
(a) a thermoset film-forming resin that is the reaction product of a polyamine and an epoxy functional polymer; and (b) magnesium oxide particles having a surface area of at least 10 square meters per gram; wherein the magnesium oxide particles are dispersed in the thermoset film-forming resin.

8 . The substrate of claim 7 , wherein the coating further comprises a phenolic resin and/or an alkoxysilane.

9 . The substrate of claim 24 , wherein the alkoxysilane comprises an epoxy-functional silane.

10 . The substrate of claim 8 , wherein the substrate is clad with pure aluminum or further comprises a chromate conversion coating.

11 . A primer and/or pretreatment coating composition, comprising:
(a) a polyacrylate, wherein the polyacrylate comprises a urethane acrylate; (b) a polythiol; and (c) corrosion resisting particles comprising magnesium oxide particles having a surface area of at least 10 square meters per gram.

12 . The composition of claim 11 , wherein the polyacrylate comprises a urethane acrylate.

13 . The primer and/or pretreatment coating composition of claim 11 , further comprising an adhesion promoting component comprising at least one of:
(a) tannic acid, gallic acid, phosphoric acid, phosphorous acid, citric acid, malonic acid, a derivative thereof, or a mixture thereof; (b) a metal phosphate; (c) an organophosphate; (d) an organophosphonate; and (e) a phosphatized epoxy resin.

14 . The primer and/or pretreatment coating composition of claim 13 , wherein the adhesion promoting component comprises a free acid and/or a phosphatized epoxy resin.

15 . A substrate comprising aluminum at least partially coated with the composition of claim 13 .

16 . The substrate of claim 15 , wherein the substrate is clad with pure aluminum or further comprises a chromate conversion coating.

17 . The method of claim 1 , wherein said particles consist of magnesium oxide.

18 . The substrate of claim 7 , wherein said particles consist of magnesium oxide.

19 . The substrate of claim 7 , wherein the coating further comprises an adhesion promoting component comprising at least one of:
(a) tannic acid, gallic acid, phosphoric acid, phosphorous acid, citric acid, malonic acid, a derivative thereof, or a mixture thereof; (b) a metal phosphate; (c) an organophosphate; (d) an organophosphonate; and (e) a phosphatized epoxy resin.

20 . The method of claim 1 , wherein the composition further comprises an alkoxysilane.

21 . The substrate of claim 7 , wherein the coating further comprises an alkoxysilane.

22 . The method of claim 1 , wherein the substrate further comprises a chromate conversion coating.

23 . The substrate of claim 7 , wherein the substrate further comprises a chromate conversion coating.

24 . The method of claim 1 , wherein the composition further comprises at least one of an organophosphate; an organophosphonate; and a phosphatized epoxy resin.

25 . The substrate of claim 7 , wherein the composition further comprises at least one of an organophosphate; an organophosphonate; and a phosphatized epoxy resin.

26 . The method of claim 1 , wherein the particles have a surface area of 30 to 500 square meters per gram.

27 . The substrate of claim 7 , wherein the particles have a surface area of 30 to 500 square meters per gram.

28 . The primer and/or pretreatment coating composition of claim 11 , wherein the particles have a surface area of 30 to 500 square meters per gram.

29 . The method of claim 1 , wherein the composition is substantially free of benzoazole derivatives.

30 . The substrate of claim 7 , wherein the primer coating is substantially free of benzoazole derivatives.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Walters David N
• Schneider John R

Classifications

• C09D123/26

  modified by chemical after-treatment · CPC title

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• Y10T428/258

  Alkali metal or alkaline earth metal or compound thereof · CPC title

• C09D5/084 Primary

  Inorganic compounds · CPC title

• C08K3/22

  of metals · CPC title