Method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers

Abstract

Cellulosic substrates are treated with compound(s) containing at least two primary amino groups and compounds containing at least one β-ketocarbonyl group. The substrates exhibit good strength and hand properties.

1 .- 18 . (canceled) 
     
     
         19 . A method for treating a substrate of cellulose-containing fibers or planar structures containing cellulose-containing fibers, comprising treating with a combination of
 (1) compounds having at least two primary amino groups and   (2) compounds having at least one β-ketocarbonyl group.   
     
     
         20 . The method of  claim 19 , wherein the compounds (2) contain β-ketocarbonyl groups of the formula
   —Y′—C(O)—CHR 4 —C(O)—CH 2 R 4      
       or their tautomeric enol form of the formula
   —Y′—C(O)—CR 4 ═C(CH 2 R 4 )—OH 
 
       in which
 Y′ is —O—, —NR 2 — or 
 
       
         
           
           
               
               
           
         
         R 2  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, and 
         R 4  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms. 
       
     
     
         21 . The method of  claim 19 , wherein Y′ is —O—. 
     
     
         22 . The method of  claim 19 , wherein one or both of R 2  and R 3  are hydrogen. 
     
     
         23 . The method of  claim 19 , wherein polyamine(s) are used as at least one compound (1). 
     
     
         24 . The method of  claim 19 , wherein β-ketocarbonyl-functional monomeric compounds (2a) of the formula
   L(—Y—C(O)—CHR 4 —C(O)—CH 2 R 4 ) e   (I)   
       or their tautomeric enol forms 
       in which
 e is an integer from 1 to 20, 
 L is a monomeric organic radical having the valency or functionality corresponding to the index e in formula (I), and 
 Y is —O— or —NR 2 —, 
 R 2  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, and 
 R 4  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms,
 are used as compounds (2). 
 
 
     
     
         25 . The method of  claim 24 , wherein e is 2 to 8. 
     
     
         26 . The method of  claim 19 , wherein β-ketocarbonyl-functional oligomeric or polymeric compounds (2b) of the formula
   K(—Y—C(O)—CHR 4 —C(O)—CH 2 R 4 ) f   (III)   
       or their tautomeric enol forms, in which
 f is an integer from 1 to 10,000, 
 K is an oligomeric or polymeric, organic or organosilicon radical having the valency or functionality corresponding to the index f in formula (III), and 
 Y is —O— or —NR 2 —, and 
 R 4  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, 
 are used as compounds (2). 
 
     
     
         27 . The method of  claim 26 , wherein an organopolysiloxane radical or an organopolysiloxane-containing copolymer radical is a radical K in the β-ketocarbonyl-functional oligomeric or polymeric compounds (2b). 
     
     
         28 . The method of  claim 19 , wherein β-ketocarbonyl-functional organosilicon compounds (2c) which contain at least one Si-bonded radical of the general formula 
       
         
           
           
               
               
           
         
         in which 
         —(Si≡) is the bond to the silicon atom, 
         R 1  is a divalent organic radical having 1 to 6 carbon atoms which optionally contain non-adjacent nitrogen atoms, 
         R 3  is a divalent organic radical having 1 to 6 carbon atoms, 
         Y is —O— or —NR 2 —, 
         R 2  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, and 
         R 4  is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, 
         Z is a divalent to hexavalent organic radical having a monomeric, oligomeric or polymeric structure, which has a weight-based heteroatom content of at least 10%, which is bonded via C atoms, 
         E 1  is a monofunctional terminal group or an Si—C-bonded radical of the formula 
       
       
         
           
           
               
               
           
         
         a is an integer from 1 to 5, and 
         x is 0 or an integer from 1 to 5, 
         are used as compounds (2). 
       
     
     
         29 . The method of  claim 28 , wherein Z is a polyether or polyester radical. 
     
     
         30 . The method of  claim 19 , wherein the treatment of the substrate is effected first with
 (1) compounds having at least two primary amino groups and subsequently with   (2) compounds having at least one β-ketocarbonyl group.   
     
     
         31 . The method of  claim 19 , wherein the treatment of the substrate is effected with a mixture of
 (1) compounds having at least two primary amino groups and   (2) compounds having at least one β-ketocarbonyl group,   the mixture of (1) and (2) being prepared before the treatment.   
     
     
         32 . The method of  claim 19 , wherein the compounds (1) are used in amounts of 1.1 to 500 mol of amino group per mole of β-ketocarbonyl group in compounds (2). 
     
     
         33 . The method of  claim 19 , wherein as the compounds (1) and (2) are used in the form of aqueous solutions or aqueous dispersions. 
     
     
         34 . The method of  claim 19 , wherein aqueous cellulose-containing fiber slurries are used as cellulose-containing fibers. 
     
     
         35 . The method of  claim 34 , wherein the compounds (1) and (2) are added to the aqueous cellulose-containing fiber slurries, the compounds (1) and (2) being added
 (i) either individually in successive steps or   (ii) together as a premix of (1) and (2).   
     
     
         36 . The method of  claim 19 , wherein paper products, such as paper towels, are used as planar structures containing cellulose-containing fibers. 
     
     
         37 . The method of  claim 36 , wherein paper towels are the planar structures. 
     
     
         38 . The method of  claim 36 , wherein the compounds (1) and (2) are sprayed onto the paper products, the compounds (1) and (2) being sprayed on
 (i) either individually in successive spraying steps or   (ii) together as a premix of (1) and (2).   
     
     
         39 . A paper product containing
 planar structures containing cellulose-containing fibers, the planar structures furthermore containing a combination of   (1) compounds having at least two primary amino groups and   (2) compounds having at least one β-ketocarbonyl group.   
     
     
         40 . The paper product of  claim 38 , wherein the compounds (1) and (2) are added to aqueous cellulose-containing fiber slurries which are used for producing the planar structures.