| 摘要 |
#CMT# #/CMT# Process for synthesizing estolide esters with high and controlled oligomerization level and of low residual acid index, comprises oligomerization of a saturated hydroxy acid and an esterification of that hydroxy acid by a monoalcohol. #CMT#USE : #/CMT# The esters are useful as lubricants and in cosmetics as emollient and moisturizer, also as surfactants. #CMT#ADVANTAGE : #/CMT# The process provides a synthesize estolides esters with high and controlled degree of oligomerization and low-acid index, preferably an acid index of = 5, preferably less than 3 (claimed). #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Process: The process is done at 100-200[deg] C, preferably 140-180[deg] C. The process is carried out in the presence of an inert gas, like nitrogen or argon. The process comprises addition of a catalyst. Preferred Components: The hydroxy acid is a saturated and hydroxylated carboxylic acid, i.e. hydroxylated acid, polyhydroxylated acid or hydroxylated polyacid. The saturated and hydroxylated carboxylic acids are saturated and monohydroxylated carboxylic acids of vegetable origin, preferably 12-hydroxy stearic acid. The monoalcohol is a branched monoalcohol, preferably ethyl-2-hexanol or isoalkylic alcohol. The catalyst is mineral or organic acid, mineral or organic base or based on tin or titanium, preferably paratoluenesulfonic acid or methanesulfonic acid. #CMT#EXAMPLE : #/CMT# 2-Ethyl hexanol (195 g), 12-hydroxy stearic acid (450 g) and methanesulfonic acid (1.5 g) were introduced into a 2 l glass reactor. The reaction medium was heated to 145[deg] C under nitrogen and under mechanical agitation for 2 hours. Then 12-hydroxy stearic acid (900 g) and methanesulfonic (1.5 g) were added and the reaction medium was heated under nitrogen at 150[deg] C for 7 hours and 30 minutes to form an acid index of less than 2. The catalyst was then neutralized with soda (0.8 g) and reaction medium was washed with water and then dried under vacuum at 90[deg] C and filtered, to obtain the ester. |
