Method of forming a self-cleaning film system

Patent metadata

Field	Value
Publication number	US-10052622-B2
Application number	US-201715429577-A
Country	US
Kind code	B2
Filing date	Feb 10, 2017
Priority date	Feb 12, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A method of forming a self-cleaning film system includes depositing a perfluorocarbon siloxane polymer onto a substrate to form a first layer. The method includes removing a plurality of portions of the first layer to define a plurality of cavities in the first layer and form a plurality of projections that protrude from the substrate. The method includes depositing a photocatalytic material onto the plurality of projections and into the plurality of cavities to form a second layer comprising: a bonded portion disposed in the plurality of cavities and in contact with the substrate, and a non-bonded portion disposed on the plurality of projections and spaced apart from the substrate. The method also includes, after depositing the photocatalytic material, removing the non-bonded portion to thereby form the self-cleaning film system.

First claim

What is claimed is:

1. A method of forming a self-cleaning film system, the method comprising:
depositing a perfluorocarbon siloxane polymer onto a substrate to form a first layer;
removing a plurality of portions of the first layer to define a plurality of cavities in the first layer and form a plurality of projections that protrude from the substrate;
depositing a photocatalytic material onto the plurality of projections and into the plurality of cavities to form a second layer comprising:
a bonded portion disposed in the plurality of cavities and in contact with the substrate; and
a non-bonded portion disposed on the plurality of projections and spaced apart from the substrate; and

after depositing the photocatalytic material, removing the non-bonded portion to thereby form the self-cleaning film system.

2. The method of claim 1 , wherein depositing the photolytic material includes chemically bonding the photocatalytic material to the substrate within the plurality of cavities.

3. The method of claim 1 , further including, after removing the non-bonded portion, removing the plurality of projections.

4. The method of claim 3 , further including, after removing the plurality of projections, redepositing the perfluorocarbon siloxane polymer.

5. The method of claim 4 , wherein redepositing includes wiping the perfluorocarbon siloxane polymer onto the substrate so that the perfluorocarbon siloxane polymer contacts the bonded portion.

6. The method of claim 1 , further including contacting the bonded portion and squalene.

7. The method of claim 6 , further including oxidizing the squalene.

8. The method of claim 6 , further including vaporizing the squalene.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Dadheech Gayatri V
• Seder Thomas A
• Carpenter James A

Classifications

• C08J7/0423

  with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder · CPC title

• B05D5/083

  involving the use of fluoropolymers · CPC title

• B01J37/0244

  Coatings comprising several layers · CPC title

• B01J37/347

  Ionic or cathodic spraying; Electric discharge · CPC title

• B01J37/0217

  Pretreatment of the substrate before coating · CPC title