Electrophoretic Coating and Preparation Method, Electrophoretic Coating Process and Selective Plating Process

Patent metadata

Field	Value
Publication number	US-2017204277-A1
Application number	US-201715411446-A
Country	US
Kind code	A1
Filing date	Jan 20, 2017
Priority date	Jan 20, 2016
Publication date	Jul 20, 2017
Grant date	—

Abstract

An electrophoretic coating is disclosed. The electrophoretic coating comprises an aqueous medium and a charged film-forming resin dispersed in the aqueous medium. The film-forming resin is acid-insoluble and alkali-soluble.

First claim

What is claimed is:

1 . An electrophoretic coating, comprising:
an aqueous medium; and a charged film-forming resin dispersed in the aqueous medium, the film-forming resin being acid-insoluble and alkali-soluble.

2 . The electrophoretic coating of claim 1 , wherein the electrophoretic coating does not contain a crosslinking agent.

3 . The electrophoretic coating of claim 1 , wherein the film-forming resin has a negatively charged phenolic hydroxy group.

4 . The electrophoretic coating of claim 3 , wherein the film-forming resin is an unmodified phenolic resin.

5 . The electrophoretic coating of claim 4 , wherein the phenolic resin comprises a linear phenolic resin and a water-soluble phenolic resin.

6 . The electrophoretic coating of claim 1 , wherein the aqueous medium comprises water and a water-miscible solvent.

7 . The electrophoretic coating of claim 6 , wherein a volume ratio of the water-miscible solvent to water is in a range of 10:90 to 30:70.

8 . The electrophoretic coating of claim 7 , wherein the water-miscible solvent comprises an alcohol solvent and an ether solvent.

9 . The electrophoretic coating of claim 8 , wherein the alcohol solvent is a C2-C6 alkyl alcohol.

10 . The electrophoretic coating of claim 8 , wherein the ether solvent is an aliphatic diol monoether.

11 . The electrophoretic coating of claim 1 , further comprising a pH adjusting agent.

12 . A method for preparing an electrophoretic coating, comprising:
dispersing a charged film-forming resin in an aqueous medium comprising water and a water miscible solvent to obtain a film-forming resin dispersion, the film-forming resin being acid-insoluble and alkali-soluble.

13 . The method of claim 12 , further comprising mixing the film-forming resin dispersion with a mixed solvent of water and a water-miscible solvent.

14 . The method of claim 13 , further comprising adding a pH adjusting agent to the film-forming resin dispersion before the mixing step.

15 . An electrophoretic coating process, comprising:
providing an electrophoretic coating comprising an aqueous medium and a charged film-forming resin dispersed in the aqueous medium, the film-forming resin being acid-insoluble and alkali-soluble; and coating a member with the electrophoretic coating using electrophoresis.

16 . A selective plating process, comprising:
forming a protective coating layer in a non-plated area on a plated surface of a substrate using an electrophoretic coating comprising an aqueous medium and a charged film-forming resin dispersed in the aqueous medium, the film-forming resin being acid-insoluble and alkali-soluble; plating the substrate; and stripping the protective coating layer from the non-plated area after plating.

17 . The selective plating process of claim 16 , wherein, in the forming step, the plated surface is coated with the electrophoretic coating using electrophoresis and the protective coating layer is then stripped from an area to be plated.

18 . The selective plating process of claim 16 , wherein, in the forming step, the protecting coating layer is applied on the plated surface of the substrate having a mask on an area to be plated, the mask then removed from the area to be plated.

19 . The selective plating process of claim 16 , wherein the stripping step is performed by washing with an inorganic alkaline solution.

Assignees

• Tyco Electronics Shanghai Co Ltd
• Tyco Electronics Amp Shanghai Ltd

Inventors

• Huang Zhongxi
• Zhou Jiankun
• Li Jinlong
• Zhang Guoping

Classifications

• C25D13/12

  characterised by the article coated · CPC title

• C09D5/4419 Primary

  with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09D5/008

  Temporary coatings (C09D5/20 takes precedence) · CPC title

• C08G8/10

  with phenol · CPC title

• C09D5/4469

  Phenoplasts; Aminoplasts · CPC title