US2010000694A1PendingUtilityA1

Paper product and method for production thereof and use thereof

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Assignee: FRAUNHOFER GES FORSCHUNGPriority: Aug 31, 2006Filed: Jul 30, 2007Published: Jan 7, 2010
Est. expiryAug 31, 2026(~0.1 yrs left)· nominal 20-yr term from priority
Inventors:Joachim StorsbergAndre LaschewskyStephan EichhornSiegfried Stapel
D21H 21/20C09D 153/005C09D 153/00C08L 51/006C08L 53/00C08L 53/005D21H 17/46C09D 151/006
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Claims

Abstract

The invention relates to a method for the production of flat paper products with increased relative wet tensile strength and softness from a pulp suspension in which a block copolymer is added to the pulp suspension and/or the paper product is treated during production thereof or subsequently with the block copolymer. The invention likewise relates to a paper product produced in this manner. Paper products of this type are used in particular as tissue products.

Claims

exact text as granted — not AI-modified
1 . A method for the production of flat paper products with increased relative wet tensile strength and softness from a pulp suspension in which a block copolymer with the blocks A and B is added to the pulp suspension and/or the paper product is treated during production thereof or subsequently with the block copolymer,
 wherein   A is a segment with at least one connectable group for cellulose and has a weight average molecular weight in the range of 300 to 3,000,000 g/mol and B represents a polyalkylene glycol segment of the general formula I   
     
       
         
         
             
             
         
       
     
     with n=2 to 6 and m being chosen such that the weight average molecular weight of segment B is in the range of 400 to 50,000 g/mol. 
   
   
       2 . The method according to  claim 1 ,
 wherein segment A is selected from the group consisting of glycidyl, benzylhalogenide, α-halogenacyl, isocyanate, anhydride, azide, tosylate and mesylate.   
   
   
       3 . The method according to  claim 1 ,
 wherein segment A is selected from the group consisting of:   
     
       
         
         
             
             
         
       
       with p=1 to 12, r=3 to 3,000, R 1 =H or CH 3  and R 2 =halogen, tosylate or mesylate, 
       R 3 =H, if R 1 =CH 3  and R 3 =CH 3 , if R 1 =H and also X=O or NR 4  with R 4 =H or CH 3 . 
     
   
   
       4 . The method according to  claim 1 ,
 wherein segment A is formed from a monomer of the general formula II   
     
       
         
         
             
             
         
       
     
     with R 1 =H. 
   
   
       5 . The method according to  claim 1 ,
 wherein segment A is formed from a monomer of the general formula II,   
     
       
         
         
             
             
         
       
     
     with R 1 =H or CH 3 ,
 together with at least one further radically polymerisable comonomer selected from the group consisting of aliphatic and aromatic methacrylic acid esters, aliphatic and aromatic acrylamides and styrene which can also be substituted with NR 5 , OR 5  and/or COOR 5  with R 5 =C 1 -C 12  alkyl or aryl. 
 
   
   
       6 . The method according to  claim 1 ,
 wherein the weight average molecular weight of segment A is in the range of 1,000 to 1,000,000 g/mol.   
   
   
       7 . The method according to  claim 1 ,
 wherein the weight average molecular weight of segment B is in the range of 400 to 10,000 g/mol.   
   
   
       8 . The method according to  claim 1 ,
 wherein the block copolymer is in addition coupled to a polymer amine.   
   
   
       9 . The method according to  claim 8 ,
 wherein the block copolymer is coupled in addition to a polyethylene imine segment of the general formula III with formation of a graft copolymer,   
     
       
         
         
             
             
         
       
       x, y and z being chosen such that the weight average molecular weight is in the range of 500 to 3,000,000 g/mol. 
     
   
   
       10 . The method according to  claim 8 ,
 wherein the block copolymer is coupled in addition to poly-4-vinylpyridine.   
   
   
       11 . The method according to  claim 8 ,
 wherein the graft copolymer has a backbone made of the polymer amine and grafts made of the block copolymer.   
   
   
       12 . The method according to  claim 8 ,
 wherein the graft copolymer has a backbone made of the block copolymer and grafts made of the polymer amine.   
   
   
       13 . The method according to  claim 1 ,
 wherein polyethylene glycol is used as polyalkylene glycol.   
   
   
       14 . The method according to  claim 1 ,
 wherein a free glycidyl function of the polyalkylene glycol is coupled via the amine groups to the polyethylene imine.   
   
   
       15 . A paper product with increased relative wet tensile strength and softness which contains cellulose fibres which are crosslinked with a block copolymer with the blocks A and B,
 wherein A is a segment with at least one connectable group for cellulose and has a weight average molecular weight in the range of 300 to 3,000,000 g/mol and   B represents a polyalkylene glycol segment of the general formula I   
     
       
         
         
             
             
         
       
       n being chosen such that the weight average molecular weight of segment B is in the range of 400 to 50,000 g/mol. 
     
   
   
       16 . The paper product according to  claim 15 ,
 wherein segment A is selected from the group consisting of glycidyl, benzylhalogenide, α-halogenacyl, isocyanate, anhydride, azide, tosylate and mesylate.   
   
   
       17 . The paper product according to  claim 15 ,
 wherein segment A is selected from the group consisting of   
     
       
         
         
             
             
         
       
       with p=1 to 12, r=3 to 3,000, R 1 =H or CH 3  and R 2 =halogen, tosylate or mesylate, 
       R 3 =H, if R 1 =CH 3  and R 3 =CH 3 , if R 1 =H and also X=O or NR 4  with R 4 =H or CH 3 . 
     
   
   
       18 . The paper product according to  claim 15 ,
 wherein segment A is formed from a monomer of formula II   
     
       
         
         
             
             
         
       
     
     with R 1 =H. 
   
   
       19 . The paper product according to  claim 15 ,
 wherein segment A is formed from a monomer of formula II   
     
       
         
         
             
             
         
       
       with R 1 =H or CH 3  together with at least one further radically polymerisable comonomer selected from the group consisting of aliphatic and aromatic methacrylic acid esters, aliphatic and aromatic acrylamides and styrene which can also be substituted with NR 5 , OR 5  and/or COOR 5  with R 5 =C 1 -C 12  alkyl or aryl. 
     
   
   
       20 . The paper product according to  claim 15 ,
 wherein the weight average molecular weight of segment A is in the range of 1,000 to 1,000,000 g/mol.   
   
   
       21 . The paper product according to  claim 15 ,
 wherein the weight average molecular weight of segment B is in the range of 400 to 10,000 g/mol.   
   
   
       22 . The paper product according to  claim 15 ,
 wherein the block copolymer is in addition coupled to a polymer amine.   
   
   
       23 . The paper product according to  claim 22 ,
 wherein the block copolymer is coupled in addition to a polyethylene imine segment of the general formula III with formation of a graft copolymer,   
     
       
         
         
             
             
         
       
       x, y and z being chosen such that the weight average molecular weight is in the range of 500 to 3,000,000 g/mol. 
     
   
   
       24 . The paper product according to  claim 22 ,
 wherein the block copolymer is coupled in addition to poly-4-vinylpyridine.   
   
   
       25 . The paper product according to  claim 22 ,
 wherein the graft copolymer has a backbone made of polyethylene imine and grafts made of the block copolymer.   
   
   
       26 . The paper product according to  claim 22 , wherein the graft copolymer has a backbone made of the block copolymer and grafts made of the polyethylene imine. 
   
   
       27 . The paper product according to  claim 22 ,
 wherein the polyethylene imine is linear.   
   
   
       28 . The paper product according to  claim 22 ,
 wherein the polyethylene imine is branched.   
   
   
       29 . The paper product according to  claim 15 ,
 wherein the polyalkylene glycol is polyethylene glycol.   
   
   
       30 . The paper product according to  claim 15 ,
 wherein a free glycidyl function of the polyalkylene glycol is coupled via the amine groups to the polyethylene imine.   
   
   
       31 . The paper product according to  claim 15  which is a tissue product.

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