Moulded polyurethane hydrogels
AssigneeEudaemon Technologies Pty Ltd
InventorsRobert Gorkin, III, Simon Cook, David Shepherd
Life of this patent
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Abstract
The technology relates to a method of producing a moulded polyurethane hydrogel, for example a condom. The method involves forming a solution of at least one polyurethane having a molecular weight of between about 40000 to about 500000 in a water:organic polar solvent comprising less than about 40% (v/v) water; applying a layer of the solution to a mould; drying the layer of the first solution to form a polyurethane film on the mould; and contacting the polyurethane film with a swelling agent under conditions such that the film forms a polyurethane hydrogel with a swelling agent content of between about 1% to about 95%.
Claims34
A method of producing a moulded polyurethane hydrogel, the method comprising:
- forming a first solution of at least one polyurethane having a molecular weight of between about 40000 to about 500000 in a water:
- organic polar solvent comprising less than about 40% (v/v) water;
- applying a layer of the first solution to a mould;
- drying the layer of the first solution to form a polyurethane film on the mould;
- and
- contacting the polyurethane film with a swelling agent under conditions such that the film forms a polyurethane hydrogel with a swelling agent content of between about 1% to about 95%,
- wherein the polyurethane consists of —CH2—(CH2—O—CH2)n—CH2—[O—OCHN(C6H10)CH2(C6H10)NHCO—O—(CH2CH2—O—CH2CH2)—O—OCHN(C6H10) CH2 (C6H10)NHCO—NH—(C6H10)CH2 (C6H10)NHCO—O—CH2CH2—O—CH2CH2—O—OCHN(C6H10)CH2(C6H10)NHCO—O]m—CH2—(CH2—O—CH2)n—CH2 and methyl and/or hydroxyl end groups, and wherein
- n is an average independently selected from any number from 1 to 35;
- and
- m is an average independently selected from any number from 15 to 500.
A moulded polyurethane hydrogel condom, wherein the polyurethane hydrogel comprises a polyurethane having a molecular weight of between about 40000 to about 500000 and a swelling agent content of between about 40% to about 70%, wherein the polyurethane consists of —CH2—(CH2—O—CH2)n—CH2—[O—OCHN(C6H10)CH2(C6H10)NHCO—O—(CH2CH2—O—CH2CH2)—O—OCHN(C6H10)CH2(C6H10)NHCO—NH—(C6H10)CH2(C6H10) NHCO—O—CH2CH2—O—CH2CH2—O—OCHN(C6H10)CH2(C6H10)NHCO—O]m—CH2—(CH2—O—CH2)n—CH2 and methyl and/or hydroxyl end groups, and wherein
- n is an average independently selected from any number from 1 to 35;
- and
- m is an average independently selected from any number from 15 to 500.
Dependencies are inferred from the claim text.