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US 4,060,683 AGranted
Preparation of cationic starches and cathionic starches thus produced
AssigneeNational Starch and Chemical Corporation
InventorMartin M. Tessler
Life of this patent
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Abstract
A reagent for the modification of starch is prepared from the reaction of a 2,3-dihalopropionamide with a secondary amine. When starch is treated with this modifying reagent, a novel cationic starch characterized by the presence of a carboxamide group bound directly to a cationic amine substituent is produced.
Claims8
A method for the preparation of modified starch products comprising the steps of
- 1. reacting a starch base with a modifying agent in an aqueous medium at a pH of 10.0 to 12.5 and a temperature of 10.degree. to 60.degree. C. for a period of 0.2 to 16 hours, said modifying agent comprising the reaction product of
- a. a 2,3-dihalopropionamide of the formula:
- ##STR5## wherein X is a bromine or chlorine and R is hydrogen or C.sub.1 -C.sub.8 alkyl with
- b. a secondary amine of the formula ##STR6## where R' and R" are, independently, alkyl, alkenyl, arylalkyl or ether substituted alkyl or alkenyl or wherein R' and R" are connected to form a cyclic amine and wherein the total number of carbon atoms in R' and R" combined is a maximum of 12, wherein the reaction to form said modifying agent is carried out at a temperature of 20.degree. to 100.degree. C, in an organic medium for a period of 10 minutes to 18 hours;
- and
- 2.
3 more elements
Dependencies are inferred from the claim text.