Treating textile materials with polyorganosiloxanes

Abstract

The invention concerns a method for treating textile materials providing said textile materials with a soft feel, absence of yellowing and good hydrophily, which consists in contacting the textile materials with a composition comprising at least a linear, cyclic or three-dimensional polyorganosiloxane of formula (I), wherein: the symbols Z, identical or different, represent R1, and/or V; and the symbols V represent a group of stericallyhindered piperidinyl function(s).

1 . A method for treating textile materials in order to provide them with a soft feel, absence of yellowing and good hydrophilicity, in which the textile materials are brought into contact with a composition comprising at least one linear, cyclic or three-dimensional polyorganosiloxane of formula (I):  
       
         
           
           
               
               
           
         
         in which: 
 (1) the symbols Z, which are identical or different, represent R 1 , and/or V;  
 (2) the symbols R 1 , R 2  and R 3 , which are identical and/or different, represent a monovalent hydrocarbon radical chosen from linear or branched alkyl radicals having from 1 to 4 carbon atoms, linear or branched alkoxy radicals having from 1 to 4 carbon atoms, a phenyl radical and, preferably, a hydroxyl radical, an ethoxy radical, a methoxy radical or a methyl radical;  
 (3) the symbols V, functional groups which are identical and/or different, represent a group containing a sterically hindered piperidinyl functional group or groups chosen from:  
                     
 
         For the groups of formula (II):  
         
           
             
             
                 
                 
             
           
         
         R 4  is a divalent hydrocarbon radical chosen from: 
 linear or branched alkylene radicals having 2 to 18 carbon atoms;  
 alkylene-carbonyl radicals in which the linear or branched alkylene portion contains 2 to 20 carbon atoms;  
 alkylene-cyclohexylene radicals in which the linear or branched alkylene portion contains 2 to 12 carbon atoms and the cyclohexylene portion contains an OH group and optionally 1 or 2 alkyl radicals having 1 to 4 carbon atoms;  
 radicals of formula —R 7 —O—R 7  in which the radicals R 7 , which are identical or different, represent alkylene radicals having 1 to 12 carbon atoms;  
 radicals of formula —R 7 —O—R 7  in which the radicals R 7  have the meanings indicated above and one of them or both of them are substituted by one or two —OH group or groups;  
 radicals of formula —R 7 —COO—R 7  in which the radicals R 7  have the meanings indicated above;  
 radicals of formula —R 8 —O—R 9 —O—CO—R 8  in which the radicals R 8  and R 9 , which are identical or different, represent alkylene radicals having 2 to 12 carbon atoms and the radical R 9  is optionally substituted by a hydroxyl radical;  
 U represents —O— or —NR 10  —, R 10  being a radical chosen from a hydrogen atom, a linear or branched alkyl radical containing 1 to 6 carbon atoms and a divalent radical of formula:  
                     
  in which R 4  has the meaning indicated above, R 5  and R 6  have the meanings indicated below and R 11  represents a linear or branched divalent alkylene radical having from 1 to 12 carbon atoms, one of the valency bonds (that of R 11 ) being linked to the atom of —NR 10 —, the other (that of R 4 ) being linked to a silicon atom;  
 
         the radicals R 5 , which are identical or different, are chosen from linear or branched alkyl radicals having 1 to 3 carbon atoms and the phenyl radical;  
         the radical R 6  represents a hydrogen radical or the radical R 5  or O.  
         For the groups of formula (III):  
         
           
             
             
                 
                 
             
           
           R′ 4  is chosen from a trivalent radical of formula:  
           
             
               
               
                   
                   
               
             
           
            where m represents a number from 2 to 20, and a trivalent radical of formula:  
           
             
               
               
                   
                   
               
             
           
            where p represents a number from 2 to 20;  
           U′ represents —O— or NR 12 —, with R 12  being a radical chosen from a hydrogen atom, a linear or branched alkyl radical containing 1 to 6 carbon atoms;  
         
         R 5  and R 6  have the same meanings as those given with respect to the formula (II); and 
 (4) the number of units ηSi with no group V is between 10 and 450, 
 the number of units ηSi with a group V is between 1 and 5,  
 0≦w≦10 and 8≦y≦448.  
 
 
       
     
     
         2 . The method as claimed in the preceding claim, characterized in that the number of units ηSi with no group V is between 50 and 250, and the number of units ηSi with a group V is between 1 and 3.  
     
     
         3 . The method as claimed in any one of the preceding claims, characterized in that the polyorganosiloxane of formula (I) is linear.  
     
     
         4 . The method as claimed in any one of the preceding claims, characterized in that V is chosen from the functional groups of formula (II).  
     
     
         5 . The method as claimed in any one of the preceding claims, characterized in that the composition containing the polyorganosiloxane is in liquid form.  
     
     
         6 . The method as claimed in any one of the claims, characterized in that the composition containing the polyorganosiloxane in liquid form is an aqueous emulsion.  
     
     
         7 . The method as claimed in any one of the preceding claims, characterized in that said method is carried out on a woven, knitted or nonwoven material, said material being at least intrinsically hydrophilic.  
     
     
         8 . The method as claimed in any one of the preceding claims, characterized in that the material treated is based on cotton, flax, wool, viscose, rayon, hemp, silk or a mixture of these materials.  
     
     
         9 . The method as claimed in any one of the preceding claims, characterized in that the quantity of polyorganosiloxane deposited on the treated textile material corresponds to a quantity of between 0.1 and 2% by weight relative to the weight of the treated dry textile material.