Aqueous polyurethane-vinyl polymer dispersions for coating applications
AssigneeAir Products and Chemicals, Inc.
InventorsBheema R. Vijayendran, Richard Derby, Bruce A. Gruber
Life of this patent
Estimating the term…
Abstract
A method for making an aqueous polyurethane-vinyl polymer dispersion which comprises: (a) forming a carboxy-containing, water-dispersible, isocyanate terminated polyurethane prepolymer, (b) adding a vinyl monomer composition which includes a polyethylenically unsaturated monomer to the prepolymer to form a prepolymer/monomer mixture, (c) adding a tertiary amine to the prepolymer/monomer mixture, (d) dispersing the prepolymer/monomer mixture in water, (e) adding an oil soluble free radical initiator and a chain-extender to the aqueous dispersion, and (f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion.
Claims24
In a method for making an aqueous polyurethane-vinyl polymer dispersion, the improvement which comprises
- (a) forming a carboxy-containing, water-dispersible, isocyanate terminated polyurethane prepolymer,
- (b) adding a vinyl monomer composition, which includes a polyethylenically unsaturated monomer, to the prepolymer to form a prepolymer/monomer mixture,
- (c) adding a tertiary amine to the prepolymer/monomer mixture in an amount sufficient to render the prepolymer water dispersible,
- (d) dispersing the prepolymer/monomer mixture in water,
- (e) adding an oil soluble free radical initiator and a chain-extender to the aqueous dispersion, and
- (f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion.
In a method for making an aqueous polyurethane-vinyl polymer dispersion, the improvement which comprises
- (a) forming a carboxy-containing, water-dispersible, aliphatic or cycloaliphatic isocyanate terminated polyurethane prepolymer,
- (b) adding a vinyl monomer composition, which includes at least one monomer which is a C.sub.1 -C.sub.6 alkyl (meth)acrylate, styrene or mixtures thereof and a polyethylenically unsaturated monomer which is a diacrylate of a C.sub.2 -C.sub.6 diol, to the prepolymer to form a prepolymer/monomer mixture,
- (c) adding a tertiary amine to the prepolymer/monomer mixture on a 65-100% amine equivalent per carboxy equivalent basis,
- (d) dispersing the prepolymer/monomer mixture in water,
- (e) adding an azo-type oil soluble free radical initiator and a diamine chain-extender to the aqueous dispersion, and
- (f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion to 65.degree.-90.degree. C.
In a method for making an aqueous polyurethane-vinyl polymer dispersion, the improvement which comprises
- (a) forming a water-dispersible, aliphatic or cycloaliphatic isocyanate terminated polyurethane prepolymer made water-dispersible by reacting with 2,2-dimethylolpropionic acid,
- (b) adding a vinyl monomer composition, which includes at least one monomer which is a C.sub.1 -C.sub.6 alkyl (meth)acrylate, styrene or mixtures thereof and a polyethylenically unsaturated monomer which is a diacrylate of a C.sub.2 -C.sub.6 diol, to the prepolymer to form a prepolymer/monomer mixture,
- (c) adding triethylamine to the prepolymer/monomer mixture on a 65-100% amine equivalent per carboxy equivalent basis,
- (d) adding a polar organic liquid to the prepolymer/monomer mixture and dispersing the mixture in water,
- (e) adding an azo-type oil soluble free radical initiator and ethylenediamine chain-extender to the aqueous dispersion, and
- (f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion to 65.degree.-90.degree. C.
Dependencies are inferred from the claim text.