Paper-Sizing Emulsion, Process for Preparing It and Use Thereof

Abstract

Aqueous paper-sizing emulsions for bulk and surface sizing with a content of fatty acid anhydrides are described in which the fatty acid anhydrides are derived from unsaturated or saturated fatty acids or their mixtures with chain lengths of C 12 -C 24 and are liquid under 50° C. The paper sizing emulsions additionally may contain another reactive or non-reactive sizing agent and/or a fixing agent containing aluminum ions. The new emulsions are suitable for the finishing of paper and cardboard.

1 . Paper-sizing emulsion with a content of fatty acid anhydrides, characterized by the fact that the fatty acid anhydrides are derived from unsaturated or saturated fatty acids or their mixtures with chain lengths of C 12 -C 24  and are liquid under 50° C. 
   
   
       2 . Paper-sizing emulsion according to  claim 1 , characterized by the fact that the fatty acid anhydrides are present as mixed anhydrides from the mentioned fatty acids or fatty acid mixtures and acetic acid. 
   
   
       3 . Paper-sizing emulsion according to  claim 1 , characterized by the fact that the fatty acid anhydrides are formed from mixtures of the mentioned fatty acids and resin acids. 
   
   
       4 . Paper-sizing emulsion according to one of the  claims 1  to  3 , characterized by the fact that the fatty acids originate from tall oil, sunflower oil, rapeseed oil, soybean oil, linseed oil or animal oil. 
   
   
       5 . Paper-sizing emulsion according to  claim 3  or  4 , characterized by the fact that the resin acids originate from balsam resin, tall oil resin, wood rosin or their mixtures. 
   
   
       6 . Paper-sizing emulsion according to one of the  claims 1  to  5 , characterized by the fact that it additionally contains at least one other reactive sizing agent or non-reacting sizing agent. 
   
   
       7 . Paper-sizing emulsion according to one of the  claims 1  to  6 , characterized by the fact that it additionally contains aluminum salts, like aluminum sulfate or polyaluminum chloride. 
   
   
       8 . Method for production of a paper-sizing emulsion, characterized by the fact that the fatty acid anhydrides, according to  claim 1  to  7 , are emulsified in an aqueous phase by shear forces or vigorous agitation. 
   
   
       9 . Method according to  claim 8 , characterized by the fact that emulsifiers are used for emulsion formation. 
   
   
       10 . Use of the paper-sizing emulsion prepared according to the method of  claim 8  or  9  for direct, continuous sizing of paper stock. 
   
   
       11 . Use of the paper-sizing emulsion prepared according to the method of  claim 8  or  9  for surface treatment of paper in the sizing press. 
   
   
       12 . Paper produced using the paper-sizing emulsion according to  claims 1  to  7 .