Treated substrate having hydrophilic region and water repellent region, and process for producing it

Abstract

A treated substrate having a hydrophilic region and a water repellent region, of which contrast is high on its surface; a process for producing a treated substrate, wherein the treated substrate can be produced with a low amount of light for a short time; wherein the water repellent region is made of a water repellent film formed by curing the composition (A) comprising a photopolymerization initiator and a compound (a) having at least one (meth)acryloyl group, and a water repellent moiety and having a film thickness of from 0.1 to 100 nm; the process uses a hydrophilic substrate or makes the surface thereof hydrophilic, then forms a film containing the composition (A) on the surface, then forms said water repellent film by irradiating light on a part of the film surface to cure the composition (A) and then removes an uncured composition (A) present thereon in order to expose the hydrophilic surface.

1 . A process for producing a treated substrate, comprising using a hydrophilic substrate or carrying out a hydrophilic treatment on a surface of a substrate to make the surface hydrophilic, then forming a film comprising the following composition (A) on the surface, then forming a water repellent film having a film thickness of from 0.1 to 100 nm by applying light on a part of the film surface to cure the composition (A) and then removing an uncured composition (A) present on the surface of the substrate in order to expose the hydrophilic surface, to obtain a treated substrate having a hydrophilic region and a water repellent region made of a water repellent film formed by curing the compound (A) on the surface of the substrate:
 composition (A): a composition comprising a photopolymerization initiator and a compound (a) having at least one polymerizable functional group selected from the group consisting of an acryloyl group and a methacryloyl group, and a water repellent moiety.   
     
     
         2 . The process according to  claim 1 , wherein the surface of the substrate is subjected to the hydrophilic treatment by subjecting the surface of the hydrophilic substrate to wet-washing or photo-washing, or by applying a hydrophilic compound on the surface of the substrate. 
     
     
         3 . The process according to  claim 1 , wherein light having a wavelength of at least 200 nm is applied. 
     
     
         4 . The process according to  claim 1 , wherein composition (A) additionally comprises a compound (b) having at least three polymerizable functional groups selected from the group consisting of an acryloyl group and a methacryloyl group, provided that the compound (b) may be the same as the compound (a) or a compound other than the compound (a). 
     
     
         5 . The process according to  claim 1 , wherein the compound (a) is a compound represented by the following formula (11), (12), (21) or (22): 
       
         
           
           
               
               
           
         
         where each of Q 1  and Q 2  which are independent of each other, is a monovalent organic group, Q 3  is an alkyl group having at least four carbon atoms, a monovalent organic group having the above alkyl group as a partial structure, a fluoroalkyl group having at least one carbon atom, which may contain an etheric oxygen atom, or a monovalent organic group having the above fluoroalkyl group as a partial structure, Q 4  is an alkylene group having at least four carbon atoms, a bivalent organic group having the above alkylene group as a partial structure, a fluoroalkylene group having at least two carbon atoms, which may contain an etheric oxygen atom, or a bivalent organic group having the above fluoroalkylene group as a partial structure, R 1  is a hydrogen atom or a methyl group, n is an integer of at least 0, and k is an integer of from 1 to 5. 
       
     
     
         6 . The process according to  claim 1 , wherein the contact angle of the hydrophilic region to water is at most 50°, and the contact angle of the water repellent region to water is at least 80°. 
     
     
         7 . The process according to  claim 1 , wherein the substrate is selected from the group consisting of glass, silicon, metal oxide and polyimide. 
     
     
         8 . A process for producing a treated substrate, comprising forming a film comprising a hydrophilic compound and the following composition (A) on a surface of a substrate, leaving it to stand still to make the hydrophilic compound move to the substrate side, then applying light on a part of the film surface to cure the composition (A) to form a water repellent film having a film thickness of from 0.1 to 100 nm, and then removing an uncured composition (A) present on the surface of the substrate in order to expose a hydrophilic surface, to obtain a treated substrate having a hydrophilic region and a water repellent region made of a water repellent film formed by curing the composition (A) on the surface of the substrate:
 is composition (A): a composition comprising a photopolymerization initiator and a compound (a) having at least one polymerizable functional group selected from the group consisting of an acryloyl group and a methacryloyl group, and a water repellent moiety.   
     
     
         9 . The process according to  claim 8 , wherein light having a wavelength of at least 200 nm is applied. 
     
     
         10 . The process according to  claim 8 , wherein composition (A) additionally comprises a compound (b) having at least three polymerizable functional groups selected from the group consisting of an acryloyl group and a methacryloyl group, provided that the compound (b) may be the same as the compound (a) or a compound other than the compound (a). 
     
     
         11 . The process according to  claim 8 , wherein the compound (a) is a compound represented by the following formula (11), (12), (21) or (22): 
       
         
           
           
               
               
           
         
         where each of Q 1  and Q 2  which are independent of each other, is a monovalent organic group, Q 3  is an alkyl group having at least four carbon atoms, a monovalent organic group having the above alkyl group as a partial structure, a fluoroalkyl group having at least one carbon atom, which may contain an etheric oxygen atom, or a monovalent organic group having the above fluoroalkyl group as a partial structure, Q 4  is an alkylene group having at least four carbon atoms, a bivalent organic group having the above alkylene group as a partial structure, a fluoroalkylene group having at least two carbon atoms, which may contain an etheric oxygen atom, or a bivalent organic group having the above fluoroalkylene group as a partial structure, R 1  is a hydrogen atom or a methyl group, n is an integer of at least 0, and k is an integer of from 1 to 5. 
       
     
     
         12 . The process according to  claim 8 , wherein the contact angle of the hydrophilic region to water is at most 50°, and the contact angle of the water repellent region to water is at least 80°. 
     
     
         13 . The process according to  claim 8 , wherein the substrate is selected from the group consisting of glass, silicon, metal oxide and polyimide. 
     
     
         14 . A process for producing a member on which a pattern of a film made of a functional material is formed, comprising applying a hydrophilic liquid comprising a functional material on a surface of a treated substrate having a hydrophilic region and a water repellent region, wherein the hydrophilic region and the water repellent region have a predetermined pattern, in order to coat the hydrophilic region with the hydrophilic liquid, followed by drying to form a pattern of a film made of the functional material, wherein the water repellent region comprises a water repellent film formed by curing the following composition (A) and having a film thickness of from 0.1 to 100 nm:
 composition (A): a composition comprising a photopolymerization initiator and a compound (a) having at least one polymerizable functional group selected from the group consisting of an acryloyl group and a methacryloyl group, and a water repellent moiety.   
     
     
         15 . The process according to  claim 14 , which additionally comprises removing the water repellent film formed by curing the composition (A) after the drying to form a pattern of a film made of the functional material.