Polyurethane polymers characterized by lactone groups and hydrox

Details Polyurethane polymers characterized by lactone groups and hydrox Polyurethane polymers characterized by lactone groups and hydrox

1977-06-23

1979-05-22

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...

106 1505, 20415919, 424 32, 424 78, 428425, C08G 1834

Patent

active

041560663

ABSTRACT:
Polyurethane polymers characterized by a molecular weight above 6,000 and having lactone groups and hydroxyl groups in the polymer backbone are prepared by reacting a mixture of polyglycols proportioned so as to provide the desired polymer properties, a polyfunctional lactone and a polyfunctional isocyanate. The product is soluble in alkaline solutions and may be used for light sensitive photographic layers on films, paper or glass; in drug delivery systems, as burn dressings, in body implants such as vascular prosthesis, and in the manufacture of catheters. The novel polymers also find use in the manufacture of artificial finger nails, finger cots, adhesives, and in protective and hydrostatic drag resistant coatings. The water absorptivity of the polyurethane lactone polymers is above 10%, preferably above 20%, and these polymers may range to completely gel-like high water absorptive polymers. The polymers of the present invention can provide a leachable substrate wherein the leaching agent may be water, gases, alcohols, esters and body fluids, e.g., animal or human.

REFERENCES:
patent: 2962524 (1960-11-01), Hostettler et al.
patent: 3025269 (1962-03-01), Calfee
patent: 3412054 (1968-11-01), Milligan et al.
patent: 3461103 (1969-08-01), Keberle et al.
patent: 3993627 (1976-11-01), Sekmakas et al.

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