Flame retardant hydraulic oil containing a synthetic ester formed by reaction of a polyol and a mixture of carboxylic acids including oleic acid and isostearic acid
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United States of America Patent
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Mar 26, 2002
Issued Date -
N/A
app pub date -
Jun 13, 1995
filing date -
Dec 7, 1992
priority date (Note) -
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Abstract
Disclosed herein is a flame retardant hydraulic oil excellent in the flame retardancy, heat stability and oxidative stability, unaccompanied by the dangers of pinhole fire and giving rise to no environmental contamination. This flame retardant hydraulic oil contains a hydraulic base oil including as the essential component a synthetic ester, which is a product formed by reacting (A) at least one polyol selected from the group consisting of neopentyl glycol, 2,2-dimethyl-3-hydroxypropyl-2',2'-dimethyl-3'-hydroxypropionate, glycerin and trimethylolpropane with (B) a carboxylic acid including 15 to 85% by mole of oleic acid based on the total carboxylic acid and 15 to 85% by mole of isostearic acid based on the total carboxylic acid or a carboxylic acid obtained by incorporating into the carboxylic acid 85% by mole or less of monocarboxylic acid having 6 to 22 carbon atoms (excluding oleic acids and isostearic acids) based on the total carboxylic acid. The synthetic ester has a kinematic viscosity of 40 to 80 cSt at 40.degree. C. and a flash point of 290.degree. C. or higher.
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