Water-dispersed electrodeposition solution for forming insulating film

Patent metadata

Field	Value
Publication number	US-10465080-B2
Application number	US-201615739917-A
Country	US
Kind code	B2
Filing date	Jun 21, 2016
Priority date	Jul 2, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A water-based electrodeposition dispersion for forming an insulating film includes: polymer particles; an organic solvent; a basic compound; and water, wherein the polymer particles include polyamic acid having a predetermined structural unit, and a volume-based median diameter (D50) of the polymer particles is 0.08 μm to 0.7 μm.

First claim

What is claimed is:

1. A water-based electro deposition dispersion for forming an insulating film comprising:
polymer particles;
an organic solvent;
a basic compound; and
water, wherein
the polymer particles include polyamic acid having at least one of structural units represented by a chemical formula (1-1) and a chemical formula (1-2) below where R represent an aromatic hydrocarbon,

a volume-based median diameter (D 50 ) of the polymer particles is 0.08 m to 0.7 pm; and
wherein the basic compound is included in a ratio of 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyamic acid.

2. The water-based electrodeposition dispersion for forming an insulating film according to claim 1 , wherein the volume-based median diameter (D 50 ) of the polymer particles is 0.1 μm to 0.55 μm.

3. The water-based electrodeposition dispersion for forming an insulating film according to claim 1 , wherein the polyamic acid has a carboxyl group at an end of the polyamic acid.

4. The water-based electrodeposition dispersion for forming an insulating film according to claim 1 , wherein a coulombic efficiency in electrodeposition is 20 mg/C or more.

5. A method of producing an insulator comprising a step of forming an insulating film on a metal surface by electrodeposition by using the water-based electrodeposition dispersion for forming an insulating film according to claim 1 .

6. The water-based electrodeposition dispersion for forming an insulating film according to claim 2 , wherein the polyamic acid has a carboxyl group at an end of the polyamic acid.

Assignees

• Mitsubishi Materials Corp

Inventors

• ISOMURA Jyunko
• Sakurai Hideaki

Classifications

• C25D13/06

  with polymers {(not used, see C09D5/44)} · CPC title

• C08G73/1071

  Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain · CPC title

• C09D179/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08G73/105

  with oxygen only in the diamino moiety · CPC title

• C25D13/04

  with organic material · CPC title