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US 4,888,383 AGranted
Method for aqueous dispersion of polyurethane modified polyacrylics
AssigneeE. I. Du Pont de Nemours and Company
InventorJozef T. Huybrechts
Life of this patent
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Abstract
A method for preparing a stable aqueous dispersion of polyurethane modified polyacrylic involving chain extension of polyacrylic with isocyanate and hydroxyl- or amino-functional groups.
Claims17
A method of preparing a stable aqueous dispersion of polyurethane-urea modified polyacrylic comprising
- a. preparing a reaction mixture in the form of an aqueous dispersion or emulsion of primary amine-functional or hydrazide-functional polyacrylic,
- b. adding to the reaction mixture an isocyanate terminated prepolymer or a diisocyanate, and
- c. reacting the resultant mixture to cause chain extension to form a polyurethane-urea modified polyacrylics.
Dependencies are inferred from the claim text.