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US 12,129,333 B2Granted
Oriented biodegradable polyurethanes
AssigneePolynovo Biomaterials Pty Limited
InventorTimothy Graeme Moore
Life of this patent
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Abstract
Provided are oriented biodegradable thermoplastic polyurethane films. The films may be prepared by extruding and drawing biodegradable polyurethane films. The polyurethanes may be prepared from biodegradable polyols and/or biodegradable chain extenders. The films possess high tensile strength yet are degradable under biological conditions. The films may be utilized in the fabrication of devices, particularly implantable medical devices.
Claims19
An oriented biodegradable thermoplastic polyurethane film, said film being the extruded and drawn product of a biodegradable thermoplastic polyurethane, wherein:
- the film is biaxially oriented;
- the polyurethane comprises hard and soft segments;
- the hard segment content (% HS) of the polyurethane is less than 60 wt %;
- and
- the polyurethane is derived from:
- one or more aliphatic polyester polyols;
- one or more aliphatic isocyanates;
- and
- one or more biodegradable chain extenders represented by formula (1) or formula (2):
- wherein R1, R2 and R3 are independently selected from optionally substituted C1-20 alkylene and optionally substituted C2-20 alkenylene.
7 more elements
Dependencies are inferred from the claim text.