Borax-free starch adhesive compositions

Abstract

The invention relates to paper or corrugated board produced using a borax-free starch adhesive composition containing a dextrin, the starch adhesive composition being cross-linked with sodium aluminate in an alkaline medium, and the quantity of sodium aluminate ranging from 1 to 35% absolutely dry relative to the quantity of dextrin.

1 . Paper or corrugated cardboard produced while using a starch glue composition free of borax that contains one dextrine where the starch glue composition is chain-linked with sodium aluminate in an alkali milieu and characterised by the fact that the quantity of sodium aluminate is in the range of 1-35% atro with reference to the use of dextrine. 
     
     
         2 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the sodium aluminate added to the starch glue composition has a granulate or powder form. 
     
     
         3 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the dextrine is a yellow dextrine. 
     
     
         4 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the sodium aluminate has a Na 2 O to Al 2 O 3  ratio in the range of 1.0-1.5. 
     
     
         5 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the starch glue composition free of borax has an alkali milieu with a pH-value of 12.5. 
     
     
         6 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the starch glue composition free of borax has a solid sodium aluminate with an Al 2 O 3  content of 53-55% before chain-linking, with a grain size distribution of 0.1-1 mm, in quantities of 1-35 weight %, with reference to the starch glue composition free of borax. 
     
     
         7 . Paper or corrugated cardboard in accordance with  claim 1  and characterised by the fact that the starch glue composition free of borax contains a sodium aluminate solution with 10-45 weight % proportion of solids when chain-linking with reference to the proportion of starch glue composition free of borax and 5-25 weight % Al 2 O 3  content as a component in the starch glue composition free of borax. 
     
     
         8 . Using a starch glue composition free of borax for manufacturing paper or corrugated cardboard in accordance with  claim 1 . 
     
     
         9 . Paper or corrugated carboard in accordance with  claim 6 , characterized in that the Al 2 O 3  is present in quantities of 2-10 weight % with reference to the starch glue composition free of borax.