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AssigneeLubrizol Advanced Materials, Inc.
InventorsAnthony D. Pajerski, Svetlana N. Lerner
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Aqueous polyurethane dispersions are made from urethane prepolymers comprising one or more polyhydroxy compounds from ketone functional molecules derived from an epoxidized natural oil. Addition of a hydrazine functional moiety to the prepolymer dispersion can further provide a crosslinking mechanism resulting in the formation of azomethine linkages in the resulting polyurethane during drying. When the ketone functional molecule is derived from levulinic acid and epoxidized vegetable oil, the resulting urethane dispersion can also be converted into a hybrid polyurethane-vinyl dispersion by adding and polymerizing one or more vinyl monomers in the polyurethane prepolymer or polyurethane dispersion.
An aqueous polyurethane dispersion comprising at least one polyol obtained from the reaction of an epoxidized natural oil having an oxirane oxygen content of about 7 to 12% by weight with an organic acid forming a residue that is co-reacted with di or other polyisocyanates to form a portion of the polyurethane wherein said residue of said epoxidized natural oil is at least 20 wt. % of the polyurethane portion of the polyurethane dispersion.
An aqueous polyurethane dispersion according to claim l, further comprising at least one vinyl polymer having ketone functional moiety(ies).
Dependencies are inferred from the claim text.