Patent ID: 8318647

Claim:
A poly(neopentylpolyol) ester composition produced by: (i) reacting pentaerythritol with a mixture of monocarboxylic acids selected from n-pentanoic acid, iso-pentanoic acid, n-hexanoic acid, n-heptanoic acid, n-octanoic acid, n-nonanoic acid and iso-nonanoic acid, wherein said mixture comprises from about 2 to about 6 moles of n-pentanoic acid and from about 0 to about 3.5 moles of n-heptanoic acid per mole of iso-nonanoic acid, 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.