Aqueous solvent dispersible linear polyurethane resins

Claim 1

An organic polyurethane resin capable of water and aqueous organic solvent redispersibility having the general formula: ##STR7## wherein a is 1, c is 0.1 to 20, d is 0 to 20, and b is the sum of a+c+d; a, b, c, and d being such that there is one --SO 3 X group per about 1,000 to 8,000 molecular weight of the polyurethane; A and A 1 are the same or different monovalent terminal groups; X is a cation selected from hydrogen, alkali metal, alkaline earth, and primary, secondary, tertiary and quarternary ammonium having 1 to 18 carbon atoms; R 1 is the residue remaining after removal of terminal hydroxyl groups from one or more diols, said diols having a number average molecular weight between about 150 and about 3,500; R 2 selected from an arenetryl group having 6 to 12 carbon atoms and an alkanetryl group having 2 to 12 carbon atoms; R 3 is the residue remaining after removal of --NCO groups from diisocyanates, wherein R 3 is selected from arylene or alkarylene having 6 to 12 carbon atoms, alkylene having 2 to 12 carbon atoms, cycloalkylene having 5 to 12 carbon atoms, or divalent 5 or 6 atom-containing ring azacyclic groups having 3 to 10 carbon atoms and 1 to 3 --NCO groups; R 4 is the residue remaining after removal of hydroxyl groups groups from one or more hydrophobic diols having a molecular weight average of about 400 to about 4,000; Y is --O--, --S--, or ##STR8## in which R 6 is hydrogen or lower alkyl of from 1 to 4 carbon atoms; R 5 is the residue remaining after the removal of terminal active hydrogen-containing groups from chain extender compounds having two Zerewitinoff hydrogens reactive with isocyanate groups and having a molecular weight of from about 18 to about 200.