Patent ID: 8680039

Claim:
A method of preparing an esterquat of Formula 1 in a fabric softener, wherein A and B are each independently CH 2 CH 2 OH or CH 2 CH 2 OCR 2 , and R 1 and R 2 are each independently selected from the group consisting of a linear or branched alkyl group and alkenyl group of C 1 -C 21 , and a combination group thereof, the method comprising: performing a first esterification reaction of a fatty acid containing triglyceride oil and a tertiary hydroxyalkylamine in a reactor at a temperature of 110-130° C. under the pressure condition of 50 mmHg or less; performing a second esterification reaction at a temperature of 130-160° C. at a point where 40-60% of the triglyceride oil is converted into a fatty acid hydroxyalkylamine ester; and performing a quaternization reaction by reacting said fatty acid hydroxyalkylamine ester with a quaternizing agent in a solvent to prepare the esterquat of Formula 1 above, wherein said fabric softener includes at least one material selected from the group consisting of glycerin and glycerides represented by formulae 2 to 6 below in an amount of 0.001 to 5 wt. %, and wherein R 3 to R 8 are each independently a linear or branched alkyl group or alkenyl group of C 11 -C 21 .