Water-reducible polyester resins and urethane coatings produced therefrom

摘要

A water-reducible polyester resin for use in producing urethane coatings comprises the reaction product of:a) hexahydrophthalic anhydride, trimellitic anhydride or phthalic anhydride;b) 1,4-cyclohexane dimethanol or trimethylol propane or mixtures thereof; andc) a polyethylene glycol selected from the group consisting of polyethylene glycols, methoxy polyethylene glycols and trifunctional polyethylene glycols having a molecular weight no greater than approximately 1050;the reaction product having a functionality between approximately 2 and 2.6. Another water-reducible polyester resin comprises the same components and a specified nonionic surfactant. Urethane coatings containing such polyester resins and a diisocyanate are also disclosed.