Patent ID: 7662758

Claim:
A polymeric polyol ester additive for metal working comprising a) about 30 to about 60 wt % repeating units from a substantially linear monocarboxylic acid having from 12 to 20 carbon atoms, b) about 5 to about 30 wt % repeating units from an alkanedioic acid having from 4-6 carbon atoms, c) about 25 to about 35 wt % repeating units from a alk(en)yl substituted succinic acid or its anhydride wherein said alk(en)yl group is an alkyl or alkenyl group, optionally branched having from 21 to 200 carbon atoms, d) about 6 to about 18 wt % repeating units from trihedral alcohol, and e) about 3 to about 12 wt % repeating units from pentaerythritol.