Use of liquid dyestuff preparations for dyeing wood

Abstract

This invention relates to a process for dyeing wood with a liquid dyestuff preparation containing (a) 5 to 30% by weight of a dyestuff of the formula (I)  wherein n 1 and n 2 denote the number 1 or 0, X represents N or CH, Ct + represents a cation, A, B, G, and D are independently a polyvalent heterocyclic or aromatic radical in which the —(CO)n 1 —O— or —O— are ortho to the respective —N═N— or —N═X—, and (b) 15 to 90% by weight of an alkoxyalcohol of the formula (II) R—O—(-Z-O—) n3 —H  (II)  wherein R denotes a straight-chain or branched C 1 -C 4 -alkyl, Z denotes a straight-chain or branched C 2 -C 3 -alkylene, and n 3 represents 1, 2, or 3, and (c) 5 to 75% by weight of water.

1 . Use of liquid dyestuff preparations for dyeing wood, wherein the liquid dyestuff preparations comprising 
 5 to 30% by weight, in particular 12 to 23% by weight, of a dyestuff of the formula I                           wherein 
 n 1  and n 2  denote the number 1 or 0,  
 X represents N or CH,  
 Ct +  represents a cation  
 and the polyvalent radicals A, B, G and D independently of one another represent heterocyclic or aromatic radicals, in particular optionally substituted phenylene and naphthylene radicals, the particular complexing —COO— or —O— group being in the ortho-position relative to the azo and azomethine group (X═CH) respectively,  
   15 to 90% by weight, in particular 15 to 60% by weight, of an alkoxy-alcohol of the formula (II)   R—O—(-Z-O—) n3 —H  (II)    wherein 
 R denotes a straight-chain or branched C 1 -C 4 -alkyl,  
 Z denotes a straight-chain or branched C 2 -C 3 -alkylene and  
 n 3  represents 1, 2 or 3, and  
   5 to 75% by weight of water are employed.    
     
     
         2 . Use according to  claim 1 , characterized in that the dyestuffs of the formula (I) are derived from the following radicals: 
 possible radicals of the formula                          Possible radicals of the formula —B—OH are, preferably:                          Possible radicals of the formula -G-(CO)n 2 OH are, preferably:                          Possible radicals of the formula -D-OH are, preferably:                          
     
     
         3 . Use according to  claim 1 , characterized in that the dyestuffs of the formula (I) employed are those of the formula (V)  
       
         
           
           
               
               
           
         
       
       wherein 
 A, B, G, D, n 1 , n 2  and Ca +  have the meanings given in  claim 1 , and  
 m represents 0 or 1 and  
 R represents 4-nitro or 5-chloro, and in the case where m=1, the o-chlorophenylazo group is in the para-position relative to the complexing —O— group.  
 
     
     
         4 . Use according to  claim 1 , characterized in that at least one dyestuff of the formulae (Ia) to (Ig)  
       
         
           
           
               
               
           
         
       
       wherein 
 Ct +  denotes a cation, in particular Li + ,  
 is employed as dyestuffs of the formula (I).  
 
     
     
         5 . Use according to  claim 1 , characterized in that at least one of the following compounds is employed as the alkoxy-alcohol of the formula (II): C 1 -C 4 -monoalkyl ethers of mono- and polyglycols, such as methyl glycol, ethyl glycol, propyl glycol, butyl glycol, methyldiethylene glycol, butyl-diethylene glycol, methyltriethylene glycol, 1-methoxy-2-propanol, 2-methoxy-1-propanol, 1-ethoxy-2-propanol, 2-ethoxy-1-propanol, dipropylene glycol monomethyl ether means (3-(3-methoxy-propoxy)-1-propanol) or dipropylene glycol monoethyl ether means (3-(3-ethoxy-1-propoxy)-1-propanol).  
     
     
         6 . Use according to  claim 1 , characterized in that the liquid dyestuff preparation furthermore comprises 
 0 to 40% by weight, in particular 20 to 35% by weight, of a cyclic ester or amide and    0 to 5% by weight of auxiliaries customary in woodstains.    
     
     
         7 . Use according to  claim 1 , wherein the liquid preparation comprises 
 20 to 90% by weight, in particular 25 to 60% by weight of an alkoxy-alcohol of the formula II wherein n 3  represents 2 or 3 is employed.    
     
     
         8 . Use according to  claim 1 , for dyeing wood, characterized in that the possible types of wood are the following: pine, spruce, fir, larch, Scots pine, oak, beech, ash, maple, walnut, pear, teak, mahogany, chestnut, birch, hazelnut, linden, willow, poplar or plane.  
     
     
         9 . Process for dyeing wood, characterized in that the dyestuff preparations according to  claim 1  are applied to the wood by brushing, rolling, spraying, impregnating or immersion, if appropriate after 300-fold dilution with water.