| abstract |
Method of making a stable aqueous dispersion of polymeric material comprising:n A) producing an NCO-terminated polyurethane prepolymer in the presence of inert liquid polymerizable ethylenically unsaturated monomer material, B) dispersing the product from A in water, C) chain-extending the prepolymer in the resulting aqueous dispersion, and D) subjecting the aqueous dispersion from C to vinyl addition polymerization conditions to polymerize said monomer material in situ, the weight ratio of chain extended polyurethane to said monomer material being about 9:1 to about 1:9., the resulting aqueous dispersions, and their use for making films, sheets and other products. |