Patent ID: 8865015

Claim:
A poly(neopentylpolyol) ester composition produced by: (i) reacting a neopentyl polyol mixture comprising pentaerythritol and up to 10 wt% of dipentaerythritol, tripentaerythritol, and optionally tetrapentaerythritol, based on the combined weight of pentaerythritol, dipentaerythritol, tripentaerythritol and tetrapentaerythritol in the neopentyl polyol mixture, with one or more monocarboxylic acids having from 5 to 11 carbon atoms in the presence of an acid catalyst and at an initial mole ratio of carboxyl groups to hydroxyl groups of greater than 0.5:1 to 0.95:1 to form a partially esterified poly(neopentylpolyol) composition; and (ii) reacting the partially esterified poly(neopentylpolyol) composition produced in (i) with additional monocarboxylic acid, wherein the additional monocarboxylic acid employed comprises the same carboxylic acids employed in (i) and wherein the polyol ester composition comprises monopentaerythritol esters, dipentaerythritol esters and polypentaerythritol esters in a weight ratio of mono- to di- to polypentaerythritol esters of about 76:16:8 to about 60:20:20 and has a viscosity index in excess of 95.