Patent ID: 8501932
Filing Date: 2013-08-06
Classification: C08B,C11D

Abstract:
1. A method for the preparation of purified cationic guar (guar 2-hydroxy-3-(trimethylammonium)propyl ether chloride) having a degree of substitution of from about 0.01 and about 3 comprising: reacting about 100 parts by weight of guar flour with 3-chloro-2-hydroxypropyl trimethylammonium chloride and sodium hydroxide in from about 5 to about 500 parts by weight of a water and alcohol mixture containing from about 20 to about 50% by weight of water; regulating the amount of water and alcohol to obtain a dispersion containing from about 65 to about 95% by weight of a water and alcohol mixture containing from about 30 to about 50% by weight of water wherein the dispersion is maintained under stirring at temperature between about 15 and about 40° C. for at least about 10 minutes; and filtering under vacuum the dispersion to obtain a filtrate comprising the purified cationic guar.