Item Having Improved Thermomechanical Properties, Comprising an Organic-Inorganic Layer

Abstract

The invention relates to an item comprising a substrate having at least one main surface coated with a multilayer interferential coating comprising at least one layer with a refractive index higher than 1.65 and at least one layer with a refractive index lower than, or equal to, 1.65, at least one of the layers of the interferential coating being an organic-inorganic layer that has been deposited in a vacuum environment and has a thickness of at least 30 nm, said interferential coating having a thickness of at least 450 nm and/or at least 8 layers.

1 .- 15 . (canceled) 
     
     
         16 . An article comprising a substrate having at least one main surface coated with a multilayer interference coating comprising at least one layer having a refractive index higher than 1.65 and at least one layer having a refractive index lower than or equal to 1.65, at least one of the layers of the interference coating being a layer of organic-inorganic nature that was deposited under vacuum and that has a thickness larger than or equal to 30 nm, said interference coating having a thickness larger than or equal to 450 nm and/or a number of layers higher than or equal to 8. 
     
     
         17 . The article as claimed in  claim 16 , wherein the layer of organic-inorganic nature comprises atoms of carbon, of oxygen and of a metal or metalloid. 
     
     
         18 . The article as claimed in  claim 16 , wherein the layer of organic-inorganic nature is deposited under the assistance of a source of ions. 
     
     
         19 . The article as claimed in  claim 16 , wherein the layer of organic-inorganic nature is obtained by depositing at least one organosilicon compound. 
     
     
         20 . The article as claimed in  claim 19 , wherein the organosilicon compound comprises at least one divalent group of formula: 
       
         
           
           
               
               
           
         
       
       where R′ 1  to R′ 4  independently denote alkyl, vinyl, aryl or hydroxyl groups or hydrolysable groups, or in that the organosilicon compound corresponds to the formula: 
       
         
           
           
               
               
           
         
       
       in which R′ 5 , R′ 6 , R′ 7  and R′ 8  independently denote hydroxyl groups or hydrolysable groups. 
     
     
         21 . The article as claimed in  claim 20 , wherein R′ 5 , R′ 6 , R′ 7  and R′ 8  independently denote hydroxyl groups or OR hydrolysable groups, in which R is an alkyl group. 
     
     
         22 . The article as claimed in  claim 19 , wherein the organosilicon compound is chosen from octamethylcyclotetrasiloxane, 2,4,6,8-tetramethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethyl cyclopentasiloxane, dodecamethylpentasiloxane, and hexamethyldisiloxane. 
     
     
         23 . The article as claimed in  claim 16 , wherein said layer of organic-inorganic nature is not formed from inorganic precursor compounds. 
     
     
         24 . The article as claimed in  claim 16 , wherein the layer of organic-inorganic nature is a layer A having a refractive index lower than or equal to 1.65. 
     
     
         25 . The article as claimed in  claim 24 , wherein the layer of organic-inorganic nature is a layer A having a refractive index lower than or equal to 1.55. 
     
     
         26 . The article as claimed in  claim 16 , wherein the interference coating has a thickness larger than or equal to 450 nm and a number of layers higher than or equal to 8. 
     
     
         27 . The article as claimed in  claim 16 , wherein the interference coating has a thickness larger than or equal to 1 μm. 
     
     
         28 . The article as claimed in  claim 27 , wherein the interference coating has a thickness larger than or equal to 1.1 μm. 
     
     
         29 . The article as claimed in  claim 16 , further defined as comprising a layer of organic-inorganic nature of thickness larger than or equal to 300 nm. 
     
     
         30 . The article as claimed in  claim 16 , wherein the interference coating comprises an underlayer comprising a layer of organic-inorganic nature. 
     
     
         31 . The article as claimed in  claim 16 , wherein the interference coating is a selective optical filter and/or an antireflection coating. 
     
     
         32 . The article as claimed in  claim 16 , further defined as having a critical temperature higher than or equal to 60° C. 
     
     
         33 . The article as claimed in  claim 16 , wherein the layer of organic-inorganic nature is deposited under ion bombardment achieved by means of an ion gun. 
     
     
         34 . The article as claimed in  claim 16 , wherein the interference coating is a selective optical filter including a filtering zone in the domain of the blue (400-500 nm).