Method for preparing modified silica film and modified silica film prepared from the same

Patent metadata

Field	Value
Publication number	US-9528028-B2
Application number	US-201414264448-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Apr 30, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A method for preparing a modified silica film includes preparing a reactive fluorine-containing polymer solution by dissolving a reactive fluorine-containing polymer including a bonding group bondable to polysilazane in a fluorine-containing solvent, preparing a polysilazane solution by dissolving polysilazane in a solvent for polysilazane, the solvent for polysilazane being immiscible with the fluorine-containing solvent and exhibiting a higher surface tension than the reactive fluorine-containing polymer and the fluorine-containing solvent, preparing a coating liquid by mixing the polysilazane solution with the reactive fluorine-containing polymer solution, forming a coating layer by coating the coating liquid onto a substrate, removing the solvent for polysilazane and the fluorine-containing solvent from the coating layer, and converting the polysilazane into silica while bonding the bonding group of the reactive fluorine-containing polymer to the polysilazane.

First claim

What is claimed is:

1. A method for preparing a modified silica film, the method comprising:
providing a reactive fluorine-containing polymer solution, the reactive fluorine-containing solution including a fluorine-containing solvent and a reactive fluorine-containing polymer including a bonding group bondable to polysilazane, the reactive fluorine-containing polymer being dissolved in the fluorine-containing solvent;
providing a polysilazane solution, the polysilazane solution including a polysilazane and a solvent for polysilazane, the solvent for polysilazane being immiscible with the fluorine-containing solvent and exhibiting a higher surface tension than the reactive fluorine-containing polymer and a higher surface tension than the fluorine-containing solvent, the polysilazane being dissolved in the solvent for polysilazane;
preparing a coating liquid by mixing the polysilazane solution with the reactive fluorine-containing polymer solution;
forming a coating layer by coating the coating liquid onto a substrate;
removing the solvent for polysilazane and the fluorine-containing solvent from the coating layer; and
converting the polysilazane into silica while bonding the bonding group of the reactive fluorine-containing polymer to the polysilazane.

2. The method as claimed in claim 1 , wherein a difference in surface tension calculated by subtracting a larger surface tension of two surface tensions of the reactive fluorine-containing polymer and the fluorine-containing solvent from surface tension of the solvent for polysilazane is about 5 mN/m or more.

3. The method as claimed in claim 1 , wherein the solvent for polysilazane is a hydrophobic and non-polar organic solvent.

4. The method as claimed in claim 3 , wherein the solvent for polysilazane includes at least one selected from the group of dibutylether, xylene, mineral turpentine, petroleum hydrocarbons, and aromatic hydrocarbons with a high boiling point.

5. The method as claimed in claim 1 , wherein the fluorine-containing solvent includes a hydrofluoroether.

6. The method as claimed in claim 1 , wherein a weight ratio of the polysilazane to the reactive fluorine-containing polymer in the coating liquid ranges from about 99:1 to about 90:10.

7. The method as claimed in claim 1 , wherein the reactive fluorine-containing polymer solution includes about 1 wt % to about 30 wt % of the reactive fluorine-containing polymer based on a total weight of the reactive fluorine-containing polymer solution.

8. The method as claimed in claim 1 , wherein the fluorine-containing solvent has a boiling point of about 61° C. or more.

9. A coating liquid, comprising:
polysilazane, a reactive fluorine-containing polymer, a solvent for polysilazane, and a fluorine-containing solvent,
wherein a difference in surface tension calculated by subtracting a larger surface tension of the surface tension of the reactive fluorine-containing polymer and the surface tension of the fluorine-containing solvent from surface tension of the solvent for polysilazane is about 5 mN/m or more.

10. The coating liquid as claimed in claim 9 , wherein the solvent for polysilazane is a hydrophobic and non-polar organic solvent.

11. The coating liquid as claimed in claim 9 , wherein the solvent for polysilazane includes at least one selected from the group of dibutylether, xylene, mineral turpentine, petroleum hydrocarbons, and aromatic hydrocarbons with a high boiling point.

12. The coating liquid as claimed in claim 9 , wherein the fluorine-containing solvent includes a hydrofluoroether.

13. The coating liquid as claimed in claim 9 , wherein the fluorine-containing solvent has a surface tension of about 15 mN/m or less and a boiling point of about 61° C. or more.

14. The coating liquid as claimed in claim 9 , further comprising an amine catalyst.

15. The coating liquid as claimed in claim 9 , wherein a weight ratio of the polysilazane to the reactive fluorine-containing polymer in the coating liquid ranges from about 99:1 to about 90:10.

16. The coating liquid as claimed in claim 9 , wherein the reactive fluorine-containing polymer solution includes about 1 wt % to about 30 wt % of the reactive fluorine-containing polymer based on a total weight of the reactive fluorine-containing polymer solution.

17. A modified silica film prepared by the method for preparing a modified silica film as claimed in claim 1 .

18. The modified silica film as claimed in claim 17 , wherein a difference in surface tension calculated by subtracting a larger surface tension of two surface tensions of the reactive fluorine-containing polymer and the fluorine-containing solvent from surface tension of the solvent for polysilazane is about 5 mN/m or more.

19. The modified silica film as claimed in claim 17 , wherein the fluorine-containing solvent includes a hydrofluoroether.

20. The modified silica film as claimed in claim 17 , wherein the fluorine-containing solvent has a boiling point of 61° C. or more.

Assignees

• Kobori Shigeto
• Cheil Ind Inc

Inventors

• Kobori Shigeto

Classifications

• C08G77/62

  Nitrogen atoms · CPC title

• C09D183/16 Primary

  in which all the silicon atoms are connected by linkages other than oxygen atoms · CPC title