Compositions for aqueous delivery of fluorinated oligomeric silanes

Abstract

The invention relates to a dilutable, non-aqueous concentrate and an aqueous dilution used for aqueous delivery of fluorinated oligomeric silanes to a substrate, a method of treating a substrate with the aqueous dilution composition to render it oil and water repellent, and articles having coatings made from the aqueous dilution.

1 . An aqueous composition comprising: 
 (1) a diluting medium comprising water or an aqueous solvent mixture comprising water and at least one water miscible cosolvent; and    (2) a dilutable, non-aqueous concentrate comprising a non-aqueous, homogeneous mixture comprising: 
 (a) at least one fluorinated oligomeric silane of the formula  
   A-M n   f M m   h M r   a -G  wherein    A is hydrogen or a residue of an initiating species;    M f  represents units derived from one or more fluorinated monomers;    M h  represents units derived from one or more non-fluorinated monomers;    M a  represents units derived from one or more non-fluorinated monomers having a silyl group, SiY 3  where Y is a hydrolyzable group; and    G is a residue of a chain transfer agent of the formula      —S-Q-Y 3      in which Y is a hydrolyzable group and Q is an organic divalent linking group; n is an integer from 1 to 100; m is an integer from 0 to 100; and r is an integer from 0 to 100; and    
 (b) at least one surfactant selected from dicocomethylammonium chloride, alkylenediolpolyethylene glycols, alkylphenol-polyethylene glycols, alkyleneoxy-containing oligomers, and mixtures thereof.  
   
     
     
         2 . The composition of  claim 1 , wherein the fluorinated monomer is of the formula  
         R f Q-E  wherein R f  is a C 2 -C 8  perfluoroalkyl group;    Q is an organic divalent linking group; and    E is an ethylenically unsaturated group.    
     
     
         3 . The composition of  claim 1  comprising at least one fluorinated oligomeric silane of the formula:  
       
         
           
           
               
               
           
         
       
       wherein 
 R f  is a C 2 -C 8  perfluoroalkyl group;  
 R is a hydrocarbon group of from 4 to 30 carbon atoms which may be substituted by one or more reactive groups;  
 R 1  and R 2  are independently hydrogen or a C 1 -C 4  alkyl group;  
 Q is —(CH 2 )- d , in which n′ is an integer from 1 to 20;  
 Q′ is a linking group of the formula —SO 2 N(R 1 )(CH 2 ) d —OC(O)—;  
 Q″ is a linking group of the formula —(CH 2 ) d —OC(O)— or a chemical bond;  
 n is an integer from 1 to 20;  
 m and r are integers from 0 to 20; and  
 d is an integer from 1 to 20.  
 
     
     
         4 . The composition of  claim 1 , which further comprises one or both of at least one organic cosolvent and at least one additive.  
     
     
         5 . The composition of  claim 4 , wherein the cosolvent is an alcohol, a ketone, an ether, N-methylpyrrolidinone, N,N-dimethylformamide, or a mixture thereof.  
     
     
         6 .- 12 . (canceled)  
     
     
         13 . The composition of claim  6 , wherein said at least one surfactant is dicocomethylammonium chloride.  
     
     
         14 . The composition of claim  6 , wherein said at least one surfactant comprises alkylenediolpolyethylene glycols, alkylphenol-polyethylene glycols or a mixture thereof.  
     
     
         15 . The composition of claim  6 , wherein said at least one surfactant comprises alkyleneoxy containing silicone oligomers.  
     
     
         16 . The composition of  claim 2 , wherein R f  is a C 3 -C 5  perfluoroalkyl group.  
     
     
         17 . The composition of  claim 2 , wherein R f  is a C 4  perfluoroalkyl group.  
     
     
         18 . The composition of  claim 1 , wherein Y is independently —Cl, OCH 3 , OC 2 H 5 , or C 3 -C 6  alkoxy interrupted by a catenary oxygen atom.  
     
     
         19 . The composition of  claim 18 , wherein Y is —Cl, —OCH 3  or —OC 2 H 5 .  
     
     
         20 .- 21 . (canceled)  
     
     
         22 . A method of treating a substrate comprising the steps of applying an aqueous composition according to  claim 1  to said substrate, and curing said aqueous composition.  
     
     
         23 . An article comprising: 
 (a) a substrate; and    (b) a coating on said substrate obtained according to the method of  claim 22 .    
     
     
         24 . The article of  claim 23 , wherein the substrate comprises glass.  
     
     
         25 . The article of  claim 23 , wherein the substrate comprises a ceramic.  
     
     
         26 . The article of  claim 23 , wherein the substrate comprises an antireflective film.