Process for repulping wet-strength broke

Abstract

A repulping process for wet-strength broke comprising a wet-strength resin and cellulosic fiber, said process comprising contacting an aqueous slurry of said broke with a mixture of 1) potassium monopersulfate as an oxidizing agent and 2) at least one of an active halogen agent, cyanuric acid, or a mixture thereof is disclosed.

1 . A repulping process for use with wet-strength broke comprising a wet-strength resin and cellulosic fiber, said process comprising contacting an aqueous slurry of said broke with a mixture of 1) potassium monopersulfate as an oxidizing agent, and 2) at least one of an active halogen agent, cyanuric acid, or a combination thereof  
   
   
       2 . The process of  claim 1  wherein the active halogen agent is an anhydrous alkali metal salt of dichloro-s-triazinetrione, halogenated dimethylhydantoin, or mixtures thereof.  
   
   
       3 . The process of  claim 1  wherein the mixture comprises potassium monopersulfate and cyanuric acid.  
   
   
       4 . The process of  claim 1  wherein the oxidizing agent and active halogen agent or cyanuric acid are present at a weight ratio of oxidizing agent to active halogen agent or cyanuric acid of from about 98:2 to about 50:50.  
   
   
       5 . The process of  claim 1  wherein in the mixture, the oxidizing agent is present at from about 50% to about 98% by weight and the halogen agent or cyanuric acid is present at from about 2% to about 50% by weight.  
   
   
       6 . The process of  claim 1  wherein the concentration of the mixture in the aqueous slurry is from about 0.5% to about 5.0% by weight based upon the dry weight of pulp.  
   
   
       7 . The process of  claim 1  which is conducted at a pH of from about 7 to about 11.  
   
   
       8 . The process of  claim 6  wherein the pH of the mixture is adjusted by addition of a base selected from the group consisting of an alkali metal hydroxide, alkali metal carbonate, alkali metal bicarbonate, alkaline earth metal hydroxide, alkaline earth metal carbonate, or alkaline earth metal bicarbonate.  
   
   
       9 . The process of  claim 1  which is conducted at a temperature of from about 25° C. to about 80° C.  
   
   
       10 . The process of  claim 1  which is conducted for a time sufficient to achieve a Voith Index of at least 5.  
   
   
       11 . The process of  claim 1  wherein at least one additional compound is added before, with, or after contacting of the slurry with the mixture.  
   
   
       12 . The process of  claim 12  wherein the additional compound comprises at least one of ink particle collectors and removers, defoamers, biocides, complexing agents, fixation and conditioning agents, surfactants and pH adjusters, or mixtures thereof.  
   
   
       13 . The process of  claim 1  wherein the combination of aqueous slurry and mixture are agitated.  
   
   
       14 . The product of the process of  claim 1.