METHOD FOR TEXTURING A SUBSTRATE HAVING A LARGE SURFACE AREA

• US 20150140837A1
• Filed: 05/14/2013
• Published: 05/21/2015
• Est. Priority Date: 05/14/2012
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Chemin, Nicolas, Sondergard, Elin, Teisseire, Jeremie
• Granted Patent: US 9,296,132 B2
• Time in Patent Office: Days
• US Class Current: 438/781
• CPC Class Codes: B29C 2043/3644 Vacuum bags; Details thereof, e.g. fixing or clamping
• CPC Class Codes: B29C 2059/023 Microembossing
• CPC Class Codes: B29C 35/0227 using pressure vessels, e.g. autoclaves, vulcanising pans B29C35/065 takes precedence
• CPC Class Codes: B29C 43/12 using bags surrounding the moulding material or using membranes contacting the moulding material
• CPC Class Codes: B29C 59/026 of layered or coated substantially flat surfaces
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: G03F 7/0002 Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping

Abstract

The invention relates:

• • to a process for forming a texture on a substrate, comprising:
    • depositing a deformable layer on the substrate;
    • bringing this deformable layer into contact with the textured face of a daughter stamp;
    • introducing the coated substrate and the daughter stamp into a pouch made of an impermeable material;
    • introducing the pouch and its contents into a hermetic vessel;
    • evacuating air from the vessel until a pressure at most equal to 0.5 bar is reached;
    • sealing the pouch before reintroducing air into the vessel;
    • introducing the sealed pouch and its contents into an autoclave;
    • applying a pressure comprised between 0.5 and 8 bar and a temperature comprised between 25 and 400° C. for 15 minutes to a plurality of hours;
    • opening the pouch; then
    • separating the substrate and the daughter stamp;
  • to a transparent assembly, comprising a glass substrate coated with a textured layer, obtained by this process; and
  • to applications of this process to obtain a substrate intended to extract, guide or redirect light, or
  • a superhydrophobic or superhydrophilic substrate.

Claims

1. A process for forming a texture on a substrate, the process comprising:

depositing a deformable layer on the substrate, thereby obtaining a coated substrate;

bringing the deformable layer into contact with a textured face of a daughter stamp;

introducing the coated substrate and the daughter stamp into a pouch that comprises an impermeable material;

introducing the pouch and its contents into a hermetic vessel;

evacuating air from the vessel until a pressure is at most equal to 0.5 bar;

sealing the pouch, thereby obtaining a sealed pouch;

reintroducing air into the vessel after sealing the pouch;

introducing the sealed pouch and its contents into an autoclave;

applying a pressure of between 0.5 and 8 bar and a temperature of between 25 and 400°

C. for at least 15 minutes;

opening the pouch;

then

separating the substrate and the daughter stamp.

2. The process as claimed in claim 1, wherein the deformable layer comprises a thermally cross-linkable material.

3. The process as claimed in claim 1, wherein the deformable layer comprises a thermoplastic polymer matrix.

4. The process as claimed in claim 1, wherein the deformable layer is a product of nanoparticles and/or organic and/or pore-forming molecules.

5. The process as claimed in claim 1, wherein the textured face of the daughter stamp is air permeable.

6. The process as claimed in claim 1,

wherein the textured face of the daughter stamp comprises a polymer or hybrid organic (polymer)/inorganic material, and

wherein applying the temperature in the autoclave comprises raising the temperature in succession to a temperature above, then below the glass transition temperature of the polymer or hybrid organic (polymer)/inorganic material, or vice versa.

7. The process of claim 1, wherein the process obtains a substrate suitable for extracting, guiding, or redirecting light.

8. The process of claim 1, wherein the process obtains a substrate suitable for microfluidics.

9. The process of claim 1, wherein the process obtains a superhydrophobic or superhydrophilic substrate.