Electroconductive composite substrates coated with electrodepositable coating compositions and methods of preparing them

Patent metadata

Field	Value
Publication number	US-9970123-B2
Application number	US-201313940943-A
Country	US
Kind code	B2
Filing date	Jul 12, 2013
Priority date	Jul 12, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The present invention is directed to a coated substrate comprising:
A) an electroconductive composite substrate comprising a resinous matrix reinforced with fibers, and B) a cured coating layer electrophoretically deposited on at least at least a portion of a surface of the substrate, wherein the cured coating layer is deposited from a curable, electrodepositable coating composition comprising:
(1) a resin component containing an active hydrogen-containing, cationic or anionic resin comprising an acrylic, polyester, polyurethane and/or polyepoxide polymer; and (2) a curing agent. The present invention is further directed to a process for coating a plastic, electroconductive substrate comprising electrophoretically depositing on the substrate the curable, electrodepositable coating composition described above, and heating the coated substrate to a temperature less than 250° F. for a time sufficient to cure the electrodeposited coating on the substrate.

First claim

What is claimed is:

1. A coated substrate comprising:
A) an electroconductive, resinous composite substrate comprising a resinous matrix reinforced with fibers, and
B) a cured coating layer electrophoretically deposited on at least a portion of a surface of the substrate, wherein the cured coating layer is deposited from a curable, electrodepositable coating composition comprising:
(1) a resin component containing an active hydrogen-containing, cationic or anionic resin comprising an acrylic, polyester, polyurethane and/or polyepoxide polymer; and
(2) a curing agent.

2. The coated substrate of claim 1 , wherein the resinous matrix comprises polystyrene, polyaniline, polypyrrole, polyepoxide, poly(methyl methacrylate), polyurethane, and/or polycarbonate.

3. The coated substrate of claim 1 , wherein the fibers are electroconductive.

4. The coated substrate of claim 1 , wherein the fibers comprise stainless steel fibers, copper fibers, nickel fibers, silver fibers, aluminum fibers, metal plated glass fibers, and/or carbon fibers.

5. The coated substrate of claim 1 , wherein the electroconductive composite substrate further comprises electroconductive particulate filler distributed throughout the resinous matrix and comprising one or more of zinc, ferrophosphorus, tungsten, carbon, nickel, aluminum, copper, iron, steel, molybdenum disulphide, iron oxide, antimony doped titanium dioxide, nickel-doped titanium dioxide, graphite, silver, and/or aluminum particles.

6. The coated substrate of claim 1 , wherein a primer or adhesion promoter coating layer is deposited on the surface of the substrate prior to application of the coating layer B).

7. The coated substrate of claim 6 , wherein an adhesion promoter coating layer is deposited on the surface of the substrate from a composition comprising:
(a) a halogenated polyolefin;
(b) a film-forming polymer different from the polyolefin (a); and
(c) an electroconductive pigment.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Moravek Scott
• Peffer Robin M
• Mayo Michael A

Classifications

• C09D5/44

  for electrophoretic applications (processes for coating by electrophoresis C25D13/00) · CPC title

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08J2423/28

  by reaction with halogens or halogen-containing compounds (C08J2423/32 takes precedence) · CPC title

• C08J7/042

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• C09D5/4473

  Mixture of polymers · CPC title