Wet-strong tissue paper

Abstract

Tissue paper having a bulk between 2 and 8 g/m 3 and containing an amount of a wet strength agent, wherein the tissue paper contains a wet strength agent in the form of a nitrogen-containing polymer having hydrophobic side-chains. Said tissue paper before converting has a relative wet strength value (RWS) of at least 45%.

1 . Tissue paper having a bulk between 2 and 8 g/m 3 , said tissue paper containing an amount of a wet strength agent and having a wet strength index of at least 1 Nm/g, wherein the tissue paper contains a wet strength agent in the form of a nitrogen-containing polymer having hydrophobic side-chain substituents and before converting has a relative wet strength value (RWS) of at least 45%.  
     
     
         2 . Tissue paper as claimed in  claim 1 , wherein the nitrogen containing polymer is a polyamine or a polyaminoamide.  
     
     
         3 . Tissue paper as claimed in  claim 2 , wherein the hydrophobic side-chain substituents comprise a hydrophobic chain having 6-40 carbons.  
     
     
         4 . Tissue paper as claimed in any of claims  1 - 3 , wherein it contains a wet strength agent in an amount from 0.7 to 4% by weight, preferably from 1 to 3% by weight.  
     
     
         5 . Tissue paper as claimed in any of claims  1 - 4 , wherein it before converting has a relative wet strength value (RWS) of at least 47% and more preferably at least 50%.  
     
     
         6 . Tissue paper as claimed in any of claims  1 - 5 , wherein it before converting has a relative wet strength value (RWS) of up to 60%.  
     
     
         7 . Tissue paper as claimed in any of claims  1 - 6 , wherein it also contains an amount of a dry strength agent.  
     
     
         8 . Tissue paper as claimed in  claim 7 , wherein the dry strength agent is a carboxy alkyl polysaccharide.  
     
     
         9 . Tissue paper as claimed in  claim 8 , wherein the carboxy alkyl polysaccharide is a carboxy alkyl cellulose.  
     
     
         10 . Tissue paper as claimed in any of claims  1 - 8 , wherein it has a dry strength index of at least 5 Nm/g.  
     
     
         11 . Tissue paper as claimed in  claim 10 , wherein it has a dry strength index of no more than 10 Nm/g.