Aqueous polyurethane - polyolefin compositions
AssigneeWitco Corporation
InventorsPeter Loewrigkeit, Kenneth A. Van Dyk
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Abstract
Method of making a stable aqueous dispersion of polymeric material comprising: (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.
Claims19
A method of preparing a stable aqueous dispersion of polymeric material comprising:
- (A) producing an NCO-terminated polyurethane prepolymer in admixture with inert liquid polymerizable ethylenically unsaturated monomer material,
- (B) dispersing the product from A in water,
- (C) chain-extending to fully react the prepolymer in the resulting aqueous dispersion from B, and
- (D) subjecting the aqueous dispersion from C to vinyl addition polymerization conditions to polymerize said monomer material in situ, the weight ratio of fully reacted chain extended polyurethane to said monomer material being about 9:1 to about 1:9.
Dependencies are inferred from the claim text.