Graft copolymers and method to prepare same
AssigneePolymer Chemistry Innovations, Inc.
InventorsBernard Gordon, James DiBattista
Life of this patent
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Abstract
A thermally processable graft copolymer formed from a water soluble polymer and a water insoluble polymer, wherein the graft copolymer forms a hydrogel upon exposure to water. A method to form such a hydrogel-forming graft copolymer by copolymerizing a water soluble 2-substituted-2-oxazolines with a water insoluble 2-substituted-2-oxazoline. A method to form such a hydrogel-forming graft copolymer by transamidating a poly-2-oxazoline with a carboxylic acid terminated water-insoluble polymer.
Claims11
A polymeric material having the structure
- wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, and propyl, X is selected from the group consisting of acetate, p-tosylate, halide, sulfate, triflate, and mixtures thereof, and POLYMER2 is a water-insoluble polymeric material having a number average molecular weight in excess of 5,000.
A method to form a polymeric composition having the structure
- wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, and propyl, X is selected from the group consisting of acetate, p-tosylate, halide, sulfate, triflate, and mixtures thereof, and POLYMER2 is a non-water soluble polymeric material having a number average molecular weight of 5,000 or greater;
- comprising the steps of:
- supplying a first monomer having the structure
- wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, and propyl;
- supplying a second monomer having the structure
- wherein POLYMER2 is a non-water soluble polymeric material having a number average molecular weight of 5,000 or greater;
- mixing said second monomer with said first monomer;
- adding a cationic polymerization catalyst R′X to said monomer mixture to form a reaction mixture, wherein X is selected from the group consisting of acetate, p-tosylate, halide, sulfate, triflate, and mixtures thereof, and wherein R′ is selected from the group consisting of hydrogen, alkyl, or aralkyl;
- stirring said reaction mixture;
- and
- heating said reaction mixture at a temperature of between about 7° C. to about 180° C. to form said polymeric composition.
A method to form a polymeric composition having the structure
- wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, and propyl, X is selected from the group consisting of acetate, p-tosylate, halide, sulfate, triflate, and mixtures thereof, and POLYMER2 is a water-insoluble polymeric material having a number average molecular weight of 5,000 or greater;
- comprising the steps of:
- supplying a first polymer having the structure
- wherein R1 is selected from the group consisting of hydrogen, methyl, ethyl, and propyl, and X is selected from the group consisting of acetate, p-tosylate, halide, sulfate, triflate, and mixtures thereof;
- supplying a second polymer having the structure
- wherein POLYMER2 is a non water soluble polymeric material having a number average molecular weight of 5,000 or greater, and Y is selected from the group consisting of OH, Cl, O−Na+, O−K+, and O−Li+;
- mixing said second polymer with said first polymer to form a reaction mixture;
- stirring said reaction mixture;
- and
- heating said reaction mixture while removing R1—COOH as it forms, to form said polymeric composition.
Dependencies are inferred from the claim text.