Witco Chemical Corporation

Other

Kenneth A Van Dyk

Peter Loewrigkeit

Shmuel Dabi

Thomas T McGimpsey

A stable aqueous dispersion of a room temperature curing polymer effective for forming films resistant to water and organic solvents, said polymer being a water-dispersible vinyl addition polymer containing a sufficient proportion of pendant N-methylolhydrazide groups to cause the polymer to cure in situ on a substrate when said dispersion is applied to the substrate and dried at ambient temperature. The polymer preferably sufficient pendant carboxylic salt groups to render the polymer water-dispersible or water soluble.

Aqueous N-methylolhydrazide-containing polymer dispersion

A stable aqueous dispersion latex of a room temperature curing polyurethane forming films resistant to water and organic solvents is disclosed, the polyurethane containing units derived from melamine, in addition to units derived from diisocyanate and difunctional reactants, in the polymer chain, pendant water-dispersing carboxylic salt groups, and room temperature curable and cross-linking N-methylol hydrazide termini, and methods for making such dispersion.

Aqueous polyurethane compositions

A latex suitable for forming improved water-resistant polyurethane products. The latex is prepared in an aqueous system by reacting an NCO-terminated, quaternized, preferably linear, polyurethane prepolymer with water and chain-extending the resulting polyurethane-urea with a difunctional or polyfunctional reagent containing groups reactive with primary amino groups, such as epoxy groups, anhydrides and aldehydes, thus increasing the molecular weight of said polyurethane-urea. The latex thus formed can be dried into highly water-resistant films, coatings, and the like.

Growing community of inventors

Stockholm, NJ, United States of America

Kenneth A Van Dyk