Substrate having a treatment surface

Abstract

For obtaining a substrate on the surface of which a water repellent film is firmly bonded through an undercoating film, and which shows a low critical inclination angle, superior durability, and high density, a water repellent and/or oil repellent film layer is formed by using a liquid for undercoating treatment. The liquid for undercoating treatment is obtained by dissolving and reacting a materiel having chlorosilil radical in molecular form therein and is dissolved into an alcohol group solvent, so that a surface roughness (Ra) of less than 0.5 nm is obtained, thereby achieving high durability and a low critical inclination angle.

What is claimed is:  
     
         1 . A substrate having a processed surface, characterized in that, on a surface of said substrate formed of glass, ceramics, plastics or metal, an undercoating film layer is formed by drying a liquid for undercoating treatment which is obtained by dissolving and reacting a materiel having chlorosilil radical in molecular form therein within a alcohol group solvent, and further characterized in that on said undercoating film layer there is formed a water repellent or oil repellent layer, and that a surface roughness (Ra) of said surface layer is equal to or less than 0.5 nm.  
     
     
         2 . A substrate having a processed surface as defined in  claim 1 , further characterized in that a concentration of said materiel having chlorosilil radical in molecular form therein contained in said liquid for undercoating treatment is equal to or greater than 0.01 wt % and equal to or less than 3.0 wt %.  
     
     
         3 . A substrate having a processed surface as defined in  claim 1 , further characterized in that a concentration of said materiel having chlorosilil radical in molecular form therein contained in said undercoating treatment liquid is equal to or greater than 0.03 wt % and equal to or less than 1.0 wt %.  
     
     
         4 . A substrate having a processed surface as defined in one of  claims 1  to  3 , further characterized in that said materiel having chlorosilil radical in molecular form therein contained in said liquid for undercoating treatment includes at least one of SiCl 4 , SiHCl 3  and SiH 2 Cl 2 .  
     
     
         5 . A substrate having a processed surface as defined in one of  claims 1  to  4 , further characterized in that the surface of said substrate on which said undercoating film layer is formed an active surface by grinding and cleaning to a surface roughness (Ra) of around from 0.5 nm to 3.0 nm.  
     
     
         6 . A surface treating method for a substrate, characterized by coating an undercoating film layer comprised of a liquid for undercoating treatment, which is obtained by dissolving and reacting a materiel having chlorosilil radical in molecular form therein within an alcohol group solvent, on a surface of a substrate of glass, ceramics, plastics or metal; drying said coated liquid for undercoating treatment; and thereafter performing a surface treatment for forming a water repellent or oil repellent surface thereon without baking.