ARTHUR COURY,DEON BEZUIDENHOUT,JANDRÉ DE VILLIERS,JOHAN COETZEE,DAVID GIDEON CONRADIE
申请号：
US15537386
公开号：
US20180016380A1
申请日:
2015.12.18
申请国别(地区):
US
年份:
2018
代理人:
摘要：
Partially crosslinked polyurethane polymers comprising diisocyanates and aliphatic hydrocarbon soft segments with a short-chain diol chain extender and a multifunctional amine and/or alcohol crosslinker to provide a polyurethane polymer with useful properties for the production of medical implant devices such as heart valves, are described. The polymers have an unexpected linear elastic region in a range from 5-100% and preferably between 10-35%. In some embodiments the polyurethanes are a thermally convertible gel formulation which may be converted to a liquid formulation by extended heating to render the polymer suitable for solvent processing techniques such as casting, spraying, spinning, etc. The invention also provides for living hinge polyurethane polymers which are thermally modifiable from a gel to a liquid and reaction injection moulded (RIM) polyurethanes with an enhanced flex life.
