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US 8,674,035 B2Granted
Biostable polyurethanes
AssigneeAortech International plc
InventorAjay Padsalgikar
Life of this patent
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Abstract
The present invention relates to a biostable polyurethane or polyurea comprising: (a) a soft segment comprising a polysiloxane of the general formula (I); and (b) greater than O and less than 40 wt % of a hard segment which is a reaction product of a diisocyanate and a linear difunctional chain extender, processes for their preparation and their use in the manufacture of biomaterials, devices, articles or implants.
Claims17
A biostable polyurethane comprising:
- (a) 60-75 wt % of a soft segment comprising greater than 98 wt % of a polysiloxane having a molecular weight in the range of 500 to 1500 of the general formula (I)
- in which
- A and A′ are O;
- R1, R2 R3 and R4 are independently selected from C1-6 alkyl;
- R5 and R6 are independently selected from C1-12 alkylene;
- and
- p is an integer of 1 or greater;
- and
- (b) 25-40 wt % of a hard segment which is a reaction product of 20-35 wt % of a diisocyanate and 2-5 wt % of a linear difunctional chain extender, based on the total weight of the polyurethane, wherein the linear difunctional chain extender consists of a (C1-C12)alkane diol or a C1-C12 alkane diamine.
6 more elements
Dependencies are inferred from the claim text.