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AssigneeTyndale Plains-Hunter, Ltd.
InventorFrancis E. Gould
Estimating the term…
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.
A polyurethane polyether resin having lactone groups in the polymer backbone.
A polyurethane polyether resin characterized by a molecular weight above 6000 and having lactone groups in the polymer backbone, said urethane polymer comprising the reaction product of:
A polyurethane polyether resin obtained by reacting a mixture of polyethylene glycol, diethylene glycol, delta gluconolactone and methylene di(cyclohexylisocyanate) in the presence of a catalyst.
A carrier system comprising an active agent and a hydrophilic polymer as a carrier vehicle therefore, said carrier vehicle comprising a polyurethane polyether resin having free hydroxyl groups and carboxylate groups in the polymer backbone.
In a method for releasing an active agent in a medium in which said active agent is used the improvement comprising:
A photosensitive coating composition comprising an alkaline solution of a polyurethane polyether resin having free hydroxyl groups and carboxylate groups in the polymer backbone and a catalyst which accelerates the cross-linking of said resin when exposed to light.
A photosensitive film comprising a layer of a dichromate catalysed polyurethane polyether resin having free hydroxyl groups and carboxylate groups in the polymer backbone supported on a substrate to which it adheres.
A method of protecting and reducing the hydrostatic drag of a surface which comprises applying thereto a coating of a catalysed polyurethane polyether resin having free hydroxyl groups and carboxylate groups in the polymer backbone and exposing said resin coating to light.
A hydrostatic drag resistant coating composition comprising an alkaline solution of a polyurethane polyether resin having free hydroxyl groups and carboxylate groups in the polymer backbone and a catalyst that accelerates the cross-linking of said resin when exposed to light.
A composition useful in the treatment of burns comprising from about 1 to about 80 parts by weight of polyvinylpyrolidone-iodide and from about 20 to about 99 parts by weight of a polyether polyurethane resin having free hydroxyl and carboxylate groups in the polymer backbone.
A burn dressing comprising a film of a polyurethane polyether resin having carboxylate groups and hydroxyl groups in the polymer backbone.
A burn dressing comprising a polyurethane polyether resin having carboxylate groups and hydroxyl groups in the polymer backbone, said polyurethane polyether resin being in the form of a finely divided powder.
A method of treating burns which comprises applying thereto from solution in a non-toxic solvent a polyurethane polyether resin having carboxylate groups and hydroxyl groups in the polymer backbone.
Dependencies are inferred from the claim text.