Patent ID: 8546494

Claim:
An isocyanate-terminated prepolymer comprising: (a) 30-60 wt % polymerized residues of a first polyol comprising a substituent of formula (I) attached via a carbon-carbon single bond to a saturated carbon atom in a fatty acid hydrocarbyl group; wherein R 1 and R 2 are esterified residues of aliphatic or cycloaliphatic diols; and wherein the first polyol comprises: (i) from 0.33 to 0.4 units of formula (I) per fatty acid hydrocarbyl group, and (ii) from 0 to 12 wt % esterified residues of at least one C 4 -C 12 anhydride, C 4 -C 12 diacid or C 4 -C 12 lactone, not including units of formula (I) attached to a fatty acid hydrocarbyl group; and wherein the first polyol has a hydroxyl number from 75 to 150 mg KOH/g; (b) 40-55 wt % polymerized residues of diphenyl methane diisocyanate (MDI); and (c) 0-20 wt % polymerized residues of a glycol having M n from 300 to 3500.