Patent ID: 8735495

Claim:
A two-component urethane system comprising: (a) a hydroxy-terminated polyester polyol comprising polymerized residues of: (i) 40 to 59 wt % of phthalic acid, and (ii) 39 to 60 wt % of an aliphatic diol having M n from 60 to 150; wherein the hydroxy-terminated polyester polyol has a hydroxyl number from 15 to 60 mg KOH/g and has no more than 10 wt % polymerized residues of aliphatic acids; and (b) an isocyanate-terminated prepolymer comprising polymerized residues of: (i) at least one of diphenyl methane diisocyanate and toluene diisocyanate; and (ii) a glycol or polyol having M n from 300 to 650; wherein the two-component urethane system is diluted with at least one solvent selected from the group consisting of ethyl acetate, methyl acetate and methyl ethyl ketone to 45-60 wt % solids.