Aqueous hydrophilic coating composition capable of forming coating film having excellent self-cleaning ability against stains adhered thereon, and surface-treated material having formed thereon coating film having excellent self-cleaning ability against stains adhered thereon

Patent metadata

Field	Value
Publication number	US-9752046-B2
Application number	US-201414777755-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Mar 21, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A water-based hydrophilic coating composition is characterized in that it is obtained by adding to a liquid medium: an inorganic compound (A) with colloidal silica (a) modified with at least one or more of organoalkoxysilane compounds (b) having one or more groups selected from the group consisting of a glycidyl group, a vinyl group and an amino group; a water-soluble resin (B); and amorphous silica (C) represented by M 2 O.SiO 2 , where the mass ratio of M 2 O/SiO 2 is from 0.05 to 0.3.

First claim

The invention claimed is:

1. A water-based hydrophilic coating composition obtained by adding to a liquid medium:
an inorganic compound (A) having colloidal silica (a) modified with at least one or more of organoalkoxysilane compounds (b) having one or more groups selected from the group consisting of a glycidyl group, a vinyl group and an amino group;
a water-soluble resin (B); and
amorphous silica (C) represented by M 2 O·SiO 2 ,
wherein M represents an alkali metal and the mass ratio of M 2 O/SiO 2 is from 0.05 to 0.3, and
wherein a mass ratio (a/b) of the component (a) to the component (b) in the inorganic compound (A) is from 0.25 to 4.

2. The water-based hydrophilic coating composition according to claim 1 , wherein a mass ratio (A/B) of the inorganic compound (A) to the water-soluble resin (B) is from 1.0 to 9.0.

3. The water-based hydrophilic coating composition according to claim 1 , wherein a mass ratio (C/[A+B]) of the amorphous silica (C) to the sum of the inorganic compound (A) and water-soluble resin (B) is from 0.05 to 0.2.

4. A method for treating a surface comprising:
applying the water-based hydrophilic coating composition according to claim 1 to the surface; and
drying the water-based hydrophilic coating composition.

5. The method according to claim 4 , wherein a mass ratio (A/B) of the inorganic compound (A) to the water-soluble resin (B) is from 1.0 to 9.0.

6. The method according to claim 4 , wherein a mass ratio (C/[A+B]) of the amorphous silica (C) to the sum of the inorganic compound (A) and water-soluble resin (B) is from 0.05 to 0.2.

7. The method according to claim 4 , wherein the surface is a surface of a material selected from the group consisting of metals, metallic alloys, plastics and glass, or a surface of a film provided on the material, wherein the film comprises one or more layers.

8. A surface-treated material comprising at least one surface, wherein the surface is treated by the method according to claim 4 .

9. A water-based hydrophilic coating composition obtained by adding to a liquid medium:
an inorganic compound (A) having colloidal silica (a) modified with at least one or more of organoalkoxysilane compounds (b) having one or more groups selected from the group consisting of a glycidyl group, a vinyl group and an amino group;
a water-soluble resin (B); and
amorphous silica (C) represented by M2O·SiO2,
wherein M represents an alkali metal and the mass ratio of M2O/SiO2 is from 0.05 to 0.3, and
wherein a mass ratio (A/B) of the inorganic compound (A) to the water-soluble resin (B) is from 2.0 to 9.0.

10. The water-based hydrophilic coating composition according to claim 9 , wherein a mass ratio (C/[A+B]) of the amorphous silica (C) to the sum of the inorganic compound (A) and water-soluble resin (B) is from 0.05 to 0.2.

11. A method for treating a surface, comprising:
applying the water-based hydrophilic coating composition according to claim 9 to the surface, and
drying the water-based hydrophilic coating composition.

12. The method according to claim 11 , wherein a mass ratio (C/[A+B]) of the amorphous silica (C) to the sum of the inorganic compound (A) and water-soluble resin (B) is from 0.05 to 0.2.

13. The method according to claim 11 , wherein the surface is a surface of a material selected from the group consisting of metals, metallic alloys, plastics and glass, or a surface of a film provided on the material, wherein the film comprises one or more layers.

14. A surface-treated material having at least one surface, wherein the surface is treated by the method according to claim 11 .

Assignees

• Nihon Parkerizing

Inventors

• Kawakami Katsuyuki
• Iwasaki Hiroshi
• Kinoshita Yasuhiro

Classifications

• C09D7/40

  Additives · CPC title

• C09J133/24

  Homopolymers or copolymers of amides or imides · CPC title

• C09D5/084

  Inorganic compounds · CPC title

• C09D201/00

  Coating compositions based on unspecified macromolecular compounds · CPC title

• C08K3/36

  Silica · CPC title