Electrodeposition system

Patent metadata

Field	Value
Publication number	US-10655023-B2
Application number	US-201715672553-A
Country	US
Kind code	B2
Filing date	Aug 9, 2017
Priority date	Feb 10, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

An electrocoat system for electrodeposition is described. The system includes an inorganic bismuth-containing compound or a mixture of inorganic and organic bismuth-containing compounds. The system demonstrates a high degree of crosslinking and produces a cured coating with optimal crosslinking and corrosion resistance.

First claim

What is claimed is:

1. A composition for electrodeposition, comprising:
an electrodeposition resin component; optionally, a crosslinking component;
optionally, an acid component; and
at least an inorganic bismuth salt of a metal oxyanion bismuth-containing compound comprising bismuth aluminate.

2. The composition of claim 1 , wherein the at least one inorganic bismuth-containing compound is a compound substantially insoluble in water at a pH of about 4 to 6 and a temperature of about 37° C.

3. The composition of claim 1 , wherein the composition includes a combination of the at least one inorganic bismuth-containing compound and an organic bismuth-containing compound comprising bismuth citrate.

4. The composition of claim 1 , further comprising:
about 40 to 95 percent by weight of the electrodeposition resin component based on the total weight of resin solids in the composition;
about 10 to 60 percent by weight of the blocked polyisocyanate component based on the total weight of resin solids in the composition;
and
about 0.5 to 10 percent by weight of the at least one inorganic bismuth-containing compound based on the total weight of resin solids in the composition.

5. A method of making a coated article by electrodeposition of a film of the composition of claim 1 .

6. The method of claim 5 , wherein the film has an average thickness of 10 to 25 pm.

7. A cationic electrodeposition bath comprising the composition of claim 1 .

8. The composition of claim 1 , wherein a coating formed from the composition is corrosion resistant.

9. The composition of claim 1 , wherein a coating formed from the composition demonstrates less than 3 mm creep from scribe according to ASTM D1654-08, wherein the coating is applied to a pretreated cold-rolled steel substrate.

10. The composition of claim 1 , wherein a coating formed from the composition demonstrates solvent resistance of at least 30 double rubs according to ASTM D5402-15.

11. A method, comprising:
combining an electrodeposition resin component including at least one crosslinkable functional group with a blocked isocyanate component;
an aliphatic carboxylic acid component; and
at least an inorganic bismuth salt of a metal oxyanion bismuth-containing compound comprising bismuth aluminate.

12. A method for electrodeposition, comprising:
providing an emulsion including a cationizable electrodeposition resin component and a blocked polyisocyanate crosslinker component; providing a pigment paste including a dispersion resin, pigment, and an inorganic bismuth salt of a metal oxyanion bismuth-containing compound comprising bismuth aluminate.

Assignees

• Valspar Sourcing Inc
• Sherwin Williams Co

Inventors

• Gelling Victoria J
• Debroy Tapan
• Ren Chun

Classifications

• C08G18/8064

  with monohydroxy compounds · CPC title

• C09D7/40

  Additives · CPC title

• B01J23/18

  Arsenic, antimony or bismuth · CPC title

• C25D13/12

  characterised by the article coated · CPC title

• B01J37/0215

  Coating · CPC title