Polyurethane polymers characterized by carboxylate groups and hy

Details Polyurethane polymers characterized by carboxylate groups and hy Polyurethane polymers characterized by carboxylate groups and hy

1978-12-22

1981-03-10

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 59, 528 65, 528 71, 528 73, 528 76, 528 80, 528 84, 128 82, 128155, 128132D, C08G 1842

Patent

active

042555507

ABSTRACT:
Water insoluble polyurethane polyether polymers that are soluble in ethanol at pH 11 characterized by a molecular weight above 6,000 and having carboxylate groups and hydroxyl groups in the polymer backbone are prepared by reacting a mixture of polyols, a polyfunctional lactone and a polyfunctional isocyanate proportioned so as to provide the desired polymer properties. The polymer so prepared contains lactone groups and hydroxyl groups in the polymer backbone. The lactone ring is opened by treating the polymer with an alkaline aqueous solution of a water miscible organic solvent to produce a water insoluble polyurethane polyether resin containing carboxylate groups and hydroxyl groups in the polymer backbone. The carboxylate groups may be in the form of a carboxylic acid group or its alkali metal or quaternary ammonium salt. The product is soluble in mixtures of water with a water miscible organic solvent and may be used in the preparation of surgical drapes and burn dressings.

REFERENCES:
patent: 3412054 (1968-11-01), Milligan et al.
patent: 4156066 (1979-05-01), Gould

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