Patent ID: 6177387
Filing Date: 2001-01-23
Classification: C07C,C10M

Abstract:
A synthetic ester composition exhibiting thermal and oxidative stability which comprises the reaction product of:(a) a polyol which comprises at least dipentaerythritol; and(b) a mixture of monocarboxylic acids comprising at least one linear acid selected from the group consisting of between C.sub.5 -C.sub.10 acids and at least one branched acid selected from the group consisting of C.sub.7 -C.sub.9 acids, wherein the amount of C.sub.5 and C.sub.6 acids is between about 20 to 45 weight %, based upon the total amount of said mixture of monocarboxylic acids,wherein said synthetic ester composition has a viscosity of at least 4 cSt at 99.degree. C., a viscosity of less than about 11,000 cSt at -40.degree. C., a viscosity index of at least 120, and a pour point of at least as low as -54.degree. C.; andwherein said synthetic ester composition exhibits the following properties: a thermal/oxidative stability measured by HPDSC at 220.degree. C., 3.445 MPa air and 0.5 wt. % dioctyl diphenyl amine of at least 25 minutes; a metals content of 10 ppm or less metals based on the total synthetic ester composition; an ash content of 15 ppm or less ash based on the total synthetic ester composition; and a total acid number of 0.05 mg KOH/g or less.