Glazing with a functional, especially hydrophobic, mesoporous coating

• US 20020034627A1
• Filed: 06/21/2001
• Published: 03/21/2002
• Est. Priority Date: 12/21/1998
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Teyssedre, Laurent, Berquier, Jean-Marc, Azzopardi, Marie-Jose, Jacquiod, Catherine
• Granted Patent: US 6,627,319 B2
• Time in Patent Office: Days
• US Class Current: 428/315.7
• CPC Class Codes: C03C 17/009 Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
• CPC Class Codes: C09K 3/18 for application to surfaces to minimize adherence of ice, mist or water thereto rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J2/30; Thawing or antifreeze materials for application to surfaces used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K5/00
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/249967 Inorganic matrix in void-containing component
• CPC Class Codes: Y10T 428/249969 Of silicon-containing material [e.g., glass, etc.]
• CPC Class Codes: Y10T 428/249979 Specified thickness of void-containing component [absolute or relative] or numerical cell dimension
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

The substrate of the invention is coated with a mesoporous film. It is characterized in that chemical molecules, especially hydrophobic/oleophobic molecules, are bonded to the mesoporous film. The invention also relates to a process for manufacturing this substrate, in which: the substrate is brought into contact with a composition formed from organic assembling groups and from a precursor for the mesoporous material; the precursor precipitates around the assembling groups and polymerizes; and the assembling groups are removed. This process is distinguished by the fact that chemical molecules, such as hydrophobic/oleophobic molecules, are then brought into contact with the mesoporous film. The invention also relates to glazing, for buildings or transportation vehicles, which includes this substrate.

Claims

1. A substrate coated with a mesoporous film, wherein chemical molecules are bonded to the mesoporous film.

2. The substrate of claim 1, wherein the substrate is made of a glass material or a plastic.

3. The substrate of claim 2, wherein the substrate is made of glass.

4. The substrate of claim 1, wherein the mesoporous film comprises at least one compound including at least one of the elements Si, W, Sb, Ti, Zr, Ta, V, Pb, Mg, Al, Mn, Co, Ni, Sn, Zn, In.

5. The substrate of claim 4, wherein the mesoporous film has a periodic lattice on the scale of domains at least about 20 nm in size.

6. The substrate of claim 4 or 5, wherein the mesoporous film is electrically conducting.

7. The substrate of claim 1, wherein said chemical molecules are hydrophobic/oleophobic and are chosen from the group consisting of:

a) silicones; and

b) compounds satisfying the formulae;

and

R_p′

SiX_4-p 

 

(II)

wherein;

m=0 to 15;

n=1 to 5;

p=0, 1 or 2;

R is a linear or branched alkyl group or a hydrogen atom;

X is a hydrolysable group such a halogen, alkoxy, acetoxy, acyloxy, amino or NCO group; and

p′

=0, 1, 2 or 3.

8. A process for manufacturing a substrate comprising:

bringing the substrate into contact with a composition formed from organic assembling groups and from at least one precursor for the material constituting a mesoporous film;

precipitating the precursor around the organic assembling groups and growing the molecules of the precursor; and

then

removing the organic assembling groups,

wherein chemical molecules, such as hydrophobic/oleophobic molecules, are then brought into contact, in the form of a solution or of a gas containing them, with the mesoporous film.

9. The process of claim 8, wherein the composition has a pH, and prior to bringing the substrate into contact with the composition, a layer having an isoelectric potential greater than or equal to the pH of the composition is deposited on the substrate.

10. The process of claim 8, wherein the organic assembling groups comprise micelles of cationic surfactant molecules, the precursor comprises a silicon alkoxide, and the organic assembling groups and precursor are in solution.

11. The process of claim 10, wherein the organic assembling groups and precursor are in hydrolysed form.

12. The process of claim 10, wherein the cationic surfactant comprises cetyltrimethylammonium bromide, the precursor is in solution due to hydrolysis in an acid medium comprising Si(OH)₄, and the surfactant/Si molar ratio is between 10⁻

4 and 0.5.

15. The substrate of claim 14, wherein said mesoporous film has pores sized between about 1.2 nm and about 40 nm.

16. The substrate of claim 14, wherein said mesoporous film has pores sized between about 1.2 nm and about 20 nm.

17. The substrate of claim 14, wherein said mesoporous film comprises a periodic lattice including domains of at least 20 nm.

18. The substrate of claim 14, wherein said mesoporous film comprises at least one compound including at least one of Si, W, Sb, Ti, Zr, Ta, V, Pb, Mg, Al, Mn, Co, Ni, Sn, Zn, and In.

19. The substrate of claim 14, wherein said coating surface comprises at least one of glass, ceramic, glass-ceramic, or polymer.

13. A glazing for buildings or transportation vehicles comprising a transparent surface, wherein at least a portion of the transparent surface comprises a substrate coated with a mesoporous film and chemical molecules bonded thereto.

14. A substrate comprising:

a coating surface; and

a mesoporous film having hydrophobic/oleophobic molecules bonded thereto,

wherein the mesoporous film is disposed on said coating surface and said molecules comprise at least one of;

a) silicones; and

b) compounds satisfying the formulae

and

R_p′

SiX_4-p 

 

(II)

wherein;

m=0 to 15;

n=1 to 5;

p=0, 1 or 2;

R comprises a linear or branched alkyl group or a hydrogen atom;

X comprises a hydrolysable group such a halogen, alkoxy, acetoxy, acyloxy, amino or NCO group; and

p′

=0, 1, 2 or 3.