Water dispersible polyurethane adhesive compositions and adhesive layer formed therefrom

Claim 1

A layer from which water has been removed comprising an incompletely reacted mixture of a first component comprising an oligourethane composition with a second component which can react with the first component; said first component comprising an oligourethane, said oligourethane comprising a polyurethane composition having an average molecular weight of less than about 15,000 and containing sufficient chemically bound hydrophilic groups selected from anionic groups, cationic groups, ethylene oxide residue and mixtures thereof to render the composition water dispersible, the molecules of said polyurethane composition comprising a plurality of amino groups or semicarbazide groups which have at least one ##STR5## group; and said second component comprising an organic compound dispersible in an aqueous solvent, the molecules of said organic compound containing a plurality of groups capable of reacting selectively with the amino or semicarbazide groups within the layer, said layer being tacky at a temperature below about 90° C.