Use of polymers containing vinylamine units as promoters for alkyldiketene glueing

Abstract

The invention relates to the use of polymers containing vinylamine units having a K-value (determined in 5% of an aqueous sodium chloride solution and at a temperature of 25%, having a pH-value of 7, and a polymer concentration of 0.5 wt. %) of 30-150 as promoters for mass glueing of paper with alkyldiketenes.

1 . A method for the engine sizing of paper with alkyldiketenes comprising adding a polymer comprising vinylamine units and having a K value as determined in 5% strength aqueous sodium chloride solution at 25° C., a pH of 7 and a polymer concentration of 0.5% by weight of from 30 to 150 to a papermaking process.  
   
   
       2 . The method for the engine sizing of paper with alkyldiketenes as claimed in  claim 1 , wherein the K value of the polymer comprising vinylamine units is from 60 to 90.  
   
   
       3 . The method for the engine sizing of paper with alkyldiketenes as claimed in  claim 1  wherein the polymer comprising vinylamine units is a hydrolyzed poly-N-vinylformamide having a degree of hydrolysis of from 1 to 100%.  
   
   
       4 . The method for the engine sizing of paper with alkyldiketenes as claimed in  claim 1  wherein the polymer comprising vinylamine units is a hydrolyzed poly-N-vinylformamide having a degree of hydrolysis of from 70 to 100%.  
   
   
       5 . The method for the engine sizing of paper with alkyldiketenes as claimed in  claim 1  wherein the polymer comprising vinylamine units is polyvinylamine.  
   
   
       6 . The method for the engine sizing of paper with alkyldiketenes as claimed in  claim 1  wherein the polymer comprising vinylamine units is added in an amount of from 0.0001 to 2.0% by weight, based on dry paper stock.