Multilayered hydrophobic window glass

• US 5,800,918 A
• Filed: 07/12/1995
• Issued: 09/01/1998
• Est. Priority Date: 07/13/1994
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Vitrage
• Original Assignee: Saint-Gobain Vitrage
• Inventors: Azzopardi, Marie-Jose, Codazzi, Nathalie, Gauthier, Fabienne, Chaussade, Pierre, Guiselin, Olivier, Naoumenko, Yves, Chartier, Pascal
• Primary Examiner(s): Nakarani, D. S.
• Application Number:
  US08/501,577
• Time in Patent Office: 1,147 Days
• Field of Search: 428/336, 428/428, 428/429, 428/432, 428/446, 428/447, 428/688, 428/689, 428/696, 428/698, 427/165
• US Class Current: 428/336
• CPC Class Codes: C03C 17/42 at least one coating of an organic material and at least one non-metal coating
• CPC Class Codes: C03C 2217/76 Hydrophobic and oleophobic coatings
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A window glass comprising a substrate made of glass, which is optionally covered, at least in part, by one or more layers and a hydrophobic-oleophobic, abrasion-resistant coating comprising an essentially mineral sublayer and a hydrophobic-oleophobic layer, wherein the density of the sublayer is equal to at least 80% of that of its constituent material.

Claims

1. A window glass comprising a substrate made of glass that is optionally covered, over at least a part, by one or more layers, and a coating comprising an essentially mineral sublayer and directly bonded thereto, a hydrophobic-oleophobic layer wherein the density of the mineral sublayer is equal to at least 80% of that of its constituent material, and wherein the mineral sublayer is selected from the group consisting of:

Al₂ O₃, Ga₂ O₃, SnO₂, TiO₂, Ta₂ O₅, Cr₂ O₃, ZrO₂, Nb₂ O₅, In₂ O₃, Fe₂ O₃, CoO₃, V₂ O₅, Y₂ O₃, TiN, SiO_x, with x being between 0 and less than 2, and SiO_p C_q, with 1<

p<

2 and 0<

q<

1, and mixtures thereof.

2. A window glass according claim 1, wherein the hardness of the sublayer is greater than that of the glass.

3. A window glass according to claim 1, wherein the sublayer thickness is between 80 and 5000 Å

.

4. A window glass according to claim 1, wherein the density of the sublayer is at least 90% of the density of its constituent material.

5. A window glass according to claim 1, wherein the sublayer is obtained by pyrolysis.

6. A window glass according to claim 1, wherein the sublayer is electrically conductive and allows the evacuation of the electrostatic charge that may accumulate on the window glass.

7. A window glass according to claim 1, wherein the sublayer consists of SnO₂ doped with fluorine.

8. A window glass according to claim 1, wherein the hydrophobic-oleophobic layer is obtained by means of at least one hydrolyzable fluorinated alkylsilane or a mixture of hydrolyzable fluorinated alkylsilanes and, optionally, other silanes.

9. A window glass according to claim 8, wherein the fluorinated alkylsilane is a perfluoroalkylsilane having the formula:

space="preserve" listing-type="equation">CF.sub.3 --(CF.sub.2).sub.n --(CH.sub.2).sub.m --SiX.sub.3

in which n is 0 to 12, m is 2 to 5, and X is a hydrolyzable group.

10. A window glass according to claim 8 or claim 10, wherein the hydrophobic layer is a layer having a thickness between 10 and 50 Å

.

15. A method for the manufacture of a window glass according to claim 1, comprising the following steps:

deposition of a hydrophobic and oleophobic layer on a dense and essentially mineral sublayer after an optional cleaning of the latter by bringing the substrate coated by the sublayer in contact with a solution containing at least one hydrolyzable fluorinated alkylsilane in a nonpolar solvent system.

16. A method for the manufacture of a window glass according to claim 1, comprising the following steps:

optional cleaning of the surface of the substrate to be coated,

deposition of an essentially mineral sublayer, with the density of the sublayer being equal to at least 80% of the density of its constituent material,

optional cleaning of the sublayer to be coated,

deposition of a hydrophobic and oleophobic layer onto said cleaned sublayer.

11. A window glass comprising a substrate made of glass and a hydrophobic-oleophobic coating that is resistant to abrasion and comprising an essentially mineral sublayer and directly bonded thereto, a hydrophobic-oleophobic layer, wherein the contact angle of a drop on the coating, having been subjected to abrasion with 500 turns of a grinding wheel according to the standard ASTM D 1044-78, is greater than 60°

, and wherein the mineral sublayer is selected from the group consisting of;

Al₂ O₃, Ga₂ O₃, SnO₂, TiO₂, Ta₂ O₅, Cr₂ O₃, ZrO₂, Nb₂ O₅, In₂ O₃, Fe₂ O₃, CoO₃, V₂ O₅, Y₂ O₃, TiN, SiO_x, with x being between 0 and less than 2, and SiO_p C_q, with 1<

p<

2 and 0<

q<

1, and mixtures thereof.

12. A window glass comprising a substrate made of glass, having a functional stacking whose last layer is an essentially mineral layer whose density is equal to at least 80% of its constituent material, with said last layer being covered, at least in part, by a hydrophobic and oleophobic layer, directly bonded thereto, and wherein the mineral sublayer is selected from the group consisting of:

Al₂ O₃, Ga₂ O₃, SnO₂, TiO₂, Ta₂ O₅, Cr₂ O₃, ZrO₂, Nb₂ O₅, In₂ O₃, Fe₂ O₃, CoO₃, V₂ O₅, Y₂ O₃, TiN, SiO_x, with x being between 0 and less than 2, and SiO_p C_q, with 1<

p<

2 and 0<

q<

1, and mixtures thereof.

13. A window glass according to claim 12, wherein the hydrophobic and oleophobic layer is obtained by means of at least one hydrolyzable fluorinated alkylsilane or a mixture of hydrolyzable fluorinated alkylsilanes and, optionally, other silanes.

14. A window glass according to claim 13, wherein the functional stacking is selected from an antireflection stacking or a low emissive and/or electrically conductive stacking.