Oil-and water-repellent finishes for textiles

Abstract

The present invention is directed to a water- and oil repellency-imparting preparation for fibrous and other substrates, the preparation comprising a fluorinated polymer and a tacking monomer, oligomer or polymer containing at least one anhydride functional group or a group capable of forming an anhydride functional group, optionally together with an anhydride-forming catalyst, such as sodium hypophosphite. The preparation can further optionally comprise other additives such as, for example, an extender; a softener; an antioxidant; a surfactant; and/or a plasticizer.

What is claimed is:  
     
         1 . A preparation for treating a textile comprising i) a fluoropolymer and ii) a tacking monomer, oligomer or polymer containing at least one anhydride functional group or a group capable of forming an anhydride functional group.  
     
     
         2 . A preparation according to  claim 1  which further comprises an anhydride-forming catalyst.  
     
     
         3 . A preparation according to  claim 1  wherein said fluoropolymer comprises one or more fluoroaliphatic radical-containing agents of the structure:  
       
         
           
           
               
               
           
         
       
       wherein: 
 m is 0 to 2;  
 n is 0 or 1;  
 o is 1 or 2;  
 A is —SO2—, —N(W)—SO 2 —, —CONH—, —CH 2 —, or —CF 2 —;  
 R is a linear, branched, or cyclic fully- or partially-fluorinated hydrocarbon;  
 W is hydrogen or C 1 -C 4  lower alkyl; and  
 X is acrylate (H 2 C═CHCO 2 —), methacrylate (H 2 C═C(CH3)CO2-), or a carbon-carbon double bond (H 2 C═CH—).  
 
     
     
         4 . A preparation according to  claim 1  wherein said fluoropolymer comprises: 
 (a) a fluoroaliphatic radical-containing agent;  
 (b) stearyl (meth)acrylate; and  
 (c) a chlorine-containing compound, selected from the group consisting of vinylidene chloride, vinyl chloride, 2-chloroethylacrylate, 2-chloroethyl vinyl ether, and 2-chloroethyl vinyl ether.  
 
     
     
         5 . A preparation according to  claim 4  wherein the fluoropolymer further comprises hydroxyalkyl (meth)acrylate.  
     
     
         6 . A preparation according to  claim 4  wherein said fluoroaliphatic radical-containing agents are selected from those of the structure:  
       
         
           
           
               
               
           
         
       
       wherein: 
 m is 0 to 2;  
 n is 0 or 1;  
 o is 1 or 2;  
 A is —SO 2 —, —N(W)—SO 2 —, —CONH—, —CH 2 —, or —CF 2 —;  
 R is a linear, branched, or cyclic fully- or partially-fluorinated hydrocarbon;  
 W is hydrogen or C 1 -C 4  lower alkyl; and  
 X is acrylate (H 2 C═CHCO 2 —), methacrylate (H 2 C═C(CH3)CO2-), or a carbon-carbon double bond (H 2 C═CH—).  
 
     
     
         7 . A preparation according to  claim 1  wherein said tacking polymer is selected from the group consisting of poly(acrylic acid), poly(maleic acid), poly(maleic anhydride), and poly(butadiene/maleic acid).  
     
     
         8 . A preparation according to  claim 2  wherein said tacking polymer is selected from the group consisting of poly(acrylic acid), poly(maleic acid), poly(maleic anhydride), and poly(butadiene/maleic acid).  
     
     
         9 . A preparation according to  claim 4  wherein said tacking polymer is selected from the group consisting of poly(acrylic acid), poly(maleic acid), poly(maleic anhydride), and poly(butadiene/maleic acid).  
     
     
         10 . A preparation according to  claim 1  which further comprises an antioxidant.  
     
     
         11 . A preparation according to  claim 1  which further comprises a softener/extender.  
     
     
         12 . A preparation according to  claim 2  wherein the catalyst is sodium hypophosphite.  
     
     
         13 . A method for treating a fibrous substrate, the method comprising: 
 exposing a fibrous substrate to an aqueous preparation comprising i) a fluoropolymer and ii) a tacking monomer, oligomer or polymer containing at least one anhydride functional group or a group capable of forming an anhydride functional group;    removing said fibrous substrate from said preparation; and    curing said fibrous substrate;    to give a fibrous substrate having durable water and oil repellency.    
     
     
         14 . A method according to  claim 13  wherein said aqueous preparation further comprises an anhydride-forming catalyst.