| 摘要 |
The invention relates to a method for producing starch solutions of high cation equivalent value (with a DS of 0.1 - 1.0). The starch to be cationize d, advantageously an oxidized starch, is slurried to form a suspension of about 10 - 80 % solids content in an aqueous mixture of a cationizing agent. In th e cationization 2,3-epoxypropyltrimethylammonium chloride or an equivalent chlorohydrin-functional cationizing agent is used by about 90 - 1100 g per k g starch solids, and a catalyst is added to the slurry. The reaction is carrie d out at a high solids content of 40 - 80 %, preferably 50 - 60 %, in at least two successive steps, in the first of which a temperature of about 5 - 40 ~C is maintained, and in the second step a temperature of about 70 - 180 ~C.</S DOAB>
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