Low-reflection glass article and method for manufacturing

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.

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.