Method for the cationisation of legume starches, cationic starches thus obtained applications thereof

Abstract

The invention relates to a novel solvent-free method for the cationisation of a legume starch. The invention also relates to the cationic starches of legume origin thus obtained. The invention further relates to the use of the cationic starches thus obtained, originating from legumes, in the paper industry and, in particular, in the wet end of a paper-making machine. In addition, the invention relates to compositions, such as aqueous compositions, containing at least one cationic starch of legume origin. Finally, the invention relates to the folding carton or paper thus obtained, containing at least one cationic starch originating from legumes.

1 - 19 . (canceled)  
   
   
       20 . A method for the cationization of a legume-derived starch, comprising the reaction of the legume-derived starch, in a granular or gelatinized form, with a cationic reagent, wherein the reaction is carried out in the sole presence of water, and in the complete absence of any other solvent compound, under conditions such that the ratio R of the quantity of water to the quantity of legume-derived starch is between 1/1000 and 10/1.  
   
   
       21 . The method as claimed in  claim 20 , wherein the cationization reaction is carried out in the presence of a quantity of water such that said ratio R is between 1/1000 and 1/2.  
   
   
       22 . The method as claimed in  claim 20 , wherein the cationization reaction is carried out in the presence of a quantity of water such that said ratio R is between 1/1000 and 1/5.  
   
   
       23 . The method as claimed in  claim 20 , wherein the cationization reaction is carried out in the presence of a quantity of water such that said ratio R between 1/500 and 1/10.  
   
   
       24 . The method as claimed in  claim 20 , wherein the reaction is carried out in the presence of an alkaline agent.  
   
   
       25 . The method as claimed in  claim 20 , wherein the reaction is carried out at a pH equal to or greater than 8.  
   
   
       26 . The method as claimed in  claim 20 , wherein the reaction is carried out at a pH greater than 10.  
   
   
       27 . The method as claimed in  claim 20 , wherein the cationic is a tertiary amine or a quaternary ammonium derivative.  
   
   
       28 . A legume-derived cationic starch, which is obtained by the method as claimed in  claim 20 , which has a nitrogen level of between 0.1 and 4%.  
   
   
       29 . A legume-derived cationic starch, which is obtained by the method as claimed in  claim 20 , which has a nitrogen level of between 0.3 and 2%.  
   
   
       30 . A legume-derived cationic starch, which is obtained by the method as claimed in  claim 20 , which has a nitrogen level of between 0.4 and 1.8%.  
   
   
       31 . A legume-derived cationic starch, which is obtained by the method as claimed in  claim 20 , which has a nitrogen level of between 0.5 and 1.5%.  
   
   
       32 . A legume-derived cationic starch, which has a nitrogen level at least equal to 0.5%.  
   
   
       33 . A legume-derived cationic starch, which has a nitrogen level of between 0.5 and 1.5%  
   
   
       34 . The legume-derived cationic starch as claimed in  claim 28 , which is crosslinked.  
   
   
       35 . The legume-derived cationic starch as claimed in  claim 28 , which is amphoteric.  
   
   
       36 . The legume-derived cationic starch as claimed in  claim 28 , which is amphoteric, wherein any anionic group carried by said starch is selected from the group comprising phosphated, sulfonated, carboxymethylated, sulfated or succinylated, in particular sulfosuccinylated, groups and hydrophobic anionic groups, in particular dicarboxylic acid ester groups and n-alkenylsuccinylated groups.  
   
   
       37 . The cationic starch as claimed in  claim 28 , which has a weight-average molecular mass of less than 50 million daltons, obtained by hydrolysis treatment carried out before, during and/or after its cationisation.  
   
   
       38 . The cationic starch as claimed in  claim 28 , which has a weight-average molecular mass of less than 5 million daltons, obtained by a hydrolysis treatment carried out before, during and/or after its cationisation.  
   
   
       39 . A starchy composition, containing at least one legume-derived cationinc starch as claimed in  claim 28 .  
   
   
       40 . The composition of  claim 39 , which is aqueous.  
   
   
       41 . A starchy composition, containing at least one legume-derived cationic starch as claimed in  claim 28  and at least one cereal or tuber starch.  
   
   
       42 . A starchy composition containing at least one legume-derived cationic starch as claimed in  claim 28  and at least one cereal or tuber cationic starch.  
   
   
       43 . A starchy composition, containing at least one legume-derived cationic starch as claimed in  claim 28 , and at least one anionic starch.  
   
   
       44 . A starchy composition containing at least one legume-derived cationic starch as claimed in  claim 28 , and at least one anionic starch, selected from the group consisting of cereal, tuber and legume anionic starches.  
   
   
       45 . An additive in the preparation of sizing agent compositions for use in paper-making, in the preparation of compositions containing at least one agent selected from optical brighteners, dyes and synthetic polymers, and/or in the wet end of a paper-making machine, as retention agent, dewatering agent and/or for improving the physical characteristics of paper, wherein said additive comprises at least one legume-derived starch as claimed in  claim 28 .  
   
   
       46 . An additive in the preparation of sizing agent compositions for use in paper-making, in the preparation of compositions containing at least one agent selected from optical brighteners, dyes and synthetic polymers, and/or in the wet end of a paper-making machine, as retention agent, dewatering agent and/or for improving the physical characteristics of paper, wherein said additive comprises at least one legume-derived-starch as claimed in  claim 28  and at least one cereal or tuber starch.  
   
   
       47 . An additive in the preparation of sizing agent compositions for use in paper-making, in the preparation of compositions containing at least one agent selected from optical brighteners, dyes and synthetic polymers, and/or in the wet end of paper-making machine, as retention agent, dewatering agent and/or for improving the physical characteristics of paper, wherein said additive comprises at least one legume-derived-starch as claimed in  claim 28  and at least one anionic starch.  
   
   
       48 . An agent for reducing interfering substances contained in water circuits and/or retained on process equipment, in particular paper-making equipment, wherein said additive comprises at least one legume-derived-starch as claimed in  claim 28 .  
   
   
       49 . An agent for reducing interfering substances contained in water circuits and/or retained on process equipment, in particular paper-making equipment, wherein said additive comprises at least one legume-derived-starch as claimed in  claim 28  and at least one cereal or tuber starch.  
   
   
       50 . An agent for reducing interfering substances contained in water circuits and/or retained on process equipment, in particular paper-making equipment, wherein said additive comprises at least one legume-derived-starch as claimed in  claim 28  and at least one anionic starch.  
   
   
       51 . Method for the manufacture of folding cardboard or paper, comprising the steps: 
 selecting a paper-making machine;    selecting a pulp;    selecting at least one additive as claimed in  claim 45;     preparing filing cardboard or paper from said pulp on said paper-making machine, utilizing said additive and/or said agent;    collecting said folding cardboard or paper.    
   
   
       52 . Folding cardboard or paper obtainable by the method as claimed in  claim 51 .  
   
   
       53 . A method for the manufacture of folding cardboard or paper, comprising the steps: 
 selecting a paper-making machine;    selecting a pulp;    selecting at least one additive as claimed in  claim 45;     selecting at least one agent for reducing interfering substances contained in water circuits and/or retained on process equipment;    preparing folding cardboard or paper from said pulp on said paper-making machine, utilizing said additive and/or said agent;    collecting said folding cardboard or paper.