Low-reflection glass article and method for manufacturing

• US 20060121190A1
• Filed: 06/01/2005
• Published: 06/08/2006
• Est. Priority Date: 12/13/1999
• Status: Abandoned Application

• Current Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Nippon Sheet Glass Company Limited (Nippon Telegraph and Telephone Corporation)
• Inventors: Okamoto, Hideki, Tsujino, Toshifumi, Kawahara, Tetsuro
• Application Number:
  US11/143,141
• Publication Number:
  US 20060121190A1
• Time in Patent Office: Days
• US Class Current: 427/226
• CPC Class Codes: C03C 1/008 for the production of films or coatings
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• 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 19/00 Surface treatment of glass, not in the form of fibres or filaments, by mechanical means sand-blasting, grinding, or polishing glass B24
• CPC Class Codes: C03C 2217/213 SiO2
• CPC Class Codes: C03C 2217/42 consisting of particles only
• CPC Class Codes: C03C 2217/478 Silica
• CPC Class Codes: C03C 2218/113 by sol-gel processes
• CPC Class Codes: C03C 2218/116 by spin-coating, centrifugation
• CPC Class Codes: F24S 80/52 characterised by the material for preventing heat loss F24S80/56
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/12 by surface treatment, e.g. by irradiation
• CPC Class Codes: H01L 31/02168 the coatings being antireflective or having enhancing optical properties for the solar cells
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Abstract

A low reflection film comprising silica fine particles and a binder in a weight ratio proportion of 60:40 to 95:5 is obtained by mixing starting fine particles comprising at least non-aggregated silica fine particles with a mean particle size of 40-1000 nm and/or linear (chain-like) aggregated silica fine particles with a mean primary particle size of 10-100 nm, a hydrolyzable metal compound, water, and a solvent, hydrolyzing the hydrolyzable metal compound in the presence of the starting fine particles, and then coating the prepared coating solution onto a glass base substrate and subjecting it to heat treatment. The obtained low reflection film is a single-layer low reflection film with low reflectivity, excellent abrasion resistance, high film strength and excellent contamination removal property, and coating of the low reflection film onto glass base substrates can give low reflection glass articles.

Claims

1. A method for manufacturing coated glass articles, the method comprising:

adding a hydrolyzable metal compound (1) in a state before hydrolyzation, to a mixture of starting fine particles (2) comprising non-aggregated silica fine particles with a mean particle size of 40-1000 nm and/or linear (chain-like) aggregated silica fine particles with a mean primary particle size of 10-100 nm, water (3), and a solvent (4),

hydrolyzing the hydrolyzable metal compound in the presence of the starting fine articles to prepare a coating solution, the coating solution undergoing a condensation reaction between a product of the hydrolysis and a silanol present on said silica fine particles,

coating a glass base substrate with the coating solution, and

heating the coating solution.

2. The method for manufacturing coated glass articles according to claim 1, wherein said hydrolyzable metal compound includes at least one type of metal alkoxide selected from the group consisting of silicon alkoxides, aluminum alkoxides, titanium alkoxides, zirconium alkoxides and tantalum alkoxides.

3. The method for manufacturing coated glass articles according to claim 1, wherein said coating solution has a starting compositional ratio of 100 parts by weight of said metal compound (in terms of the metal oxide), 150-1900 parts by weight of said starting fine particles, 0-200 parts by weight of a catalyst, 50-10,000 parts by weight of said water and 1000-500,000 parts by weight of said solvent.

4. The method for manufacturing coated glass articles according to claim 2, wherein said coating solution has a starting compositional ratio of 1 00 parts by weight of said metal compound (in terms of the metal oxide), 150-1900 parts by weight of said starting fine particles, 0-200 parts by weight of a catalyst, 50-10,000 parts by weight of said water and 1000-500,000 parts by weight of said solvent.

5. A method for manufacturing coated glass articles, the method comprising:

adding a hydrolyzable metal compound (1) in a state before hydrolyzation, to a mixture of starting fine particles (2) comprising non-aggregated silica fine particles with a mean particle size of 40-1000 nm and/or linear (chain-like) aggregated silica fine particles with a mean primary particle size of 10-100 nm, water (3), and a solvent (4), wherein the starting fine particles and the metal compound are present in a weight ratio proportion of 60;

40 to 95;

5 with the metal compound in terms of metal oxide,

hydrolyzing the hydrolyzable metal compound in the presence of the starting fine articles to prepare a coating solution, the coating solution undergoing a condensation reaction between a product of the hydrolysis and a silanol present on the silica fine particles,

coating a glass base substrate with the coating solution, and

heating the coating solution.

6. The method for manufacturing coated glass articles according to claim 5, wherein hydrolyzing the hydrolyzable metal compound is conducted in the presence of an acid catalyst, the acid catalyst being added before or after the addition of the hydrolysable metal compound to the starting fine particles.

7. The method for manufacturing coated glass articles according to claim 5, wherein said hydrolyzable metal compound includes at least one type of metal alkoxide selected from the group consisting of silicon alkoxides, aluminum alkoxides, titanium alkoxides, zirconium alkoxides and tantalum alkoxides.

8. The method for manufacturing coated glass articles according to claim 6, wherein said hydrolyzable metal compound includes at least one type of metal alkoxide selected from the group consisting of silicon alkoxides, aluminum alkoxides, titanium alkoxides, zirconium alkoxides and tantalum alkoxides.

9. The method for manufacturing coated glass articles according to claim 6, wherein the coating solution has a starting compositional ratio of 100 parts by weight of the metal compound (in terms of the metal oxide), 150-1900 parts by weight of the starting fine particles, 0-200 parts by weight of the catalyst, 50-10,000 parts by weight of the water and 1000-500,000 parts by weight of the solvent.