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AssigneeAortech Biomaterials PTY LTD
InventorsPathiraja A. Gunatillake, Simon J. McCarthy, Gordon F. Meijs, Raju Adhikari
Estimating the term…
A shape memory polyurethane or polyurethane-urea polymer including a reaction product of: (A) (a) silicon-based macrodiol, silicon-based macrodiamine and/or polyether of the formula (I): A—[(CH2)m—O]n—(CH2)m—A′, wherein A and A are endcapping groups; m is an integer of 6 or more; and n is an integer of 1 or greater; (b) a diisocyanate; and (c) a chain extender; or (B) (b) a diisocyanate: and (c) a chain extender, said polymer having a glass transition temperature which enables the polymer to be formed into a first shape at a temperature higher than the glass transition temperature and maintained in said first shape when the polymer is cooled to a temperature lower than the glass transition temperature, said polymer then being capable of resuming its original shape on heating to a temperature higher than the glass transition temperature. The present invention also relates to a shape memory composition which includes a blend of two or more of the shape memory polyurethane or polyurethane-urea polymers defined above or at least one shape memory polyurethane or polyurethane-urea polymer defined above in combination with another material. The present invention further relates to processes for preparing materials having improved mechanical properties, clarity, processability, biostability and/or degradation resistance and devices or articles containing the shape memory polyurethane or polyurethane-urea polymer and/or composition defined above.
A shape memory polyurethane or polyurethane-urea polymer including a reaction product of (a), (b) and (c) as set out under (A) below, a reaction product of (b) and (c) as set out under (B) below or a reaction product of (b) and (d) as set out under (C) below:
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein component (a) has greater than about 70% silicon based macrodiol.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the molecular weight range of component (a) is about 300 to about 2000.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the molecular weight range of component (a) is about 300 to about 700.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the silicon-based macrodiol or macrodiamine is a polysilane, polysiloxane, amino-terminated polysiloxane or a silicon-based polycarbonate.
A shape memory polyurethane or polyurethane-urea polymer according to claim 25 to claim 27, wherein the molecular weight range of the polyether macrodiol is about 300 to about 2000.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the diisocyanate is an aliphatic or aromatic diisocyanate.
A shape memory polyurethane or polyurethane-urea polymer according to any of the preceding claims, wherein the diisocyanate is 4,4′-diphenylmethane diisocyanate (MDI), methylene biscyclohexyl diisocyanate (H12MDI), p-phenylene diisocyanate (p-PDI), trans-cyclohexane-1,4-diisocyanate (CHDI), 1,6-diisocyanatohexane (DICH), 1,5-diisocyanatonaphthalene (NDI), para-tetramethylxylenediisocyanate (p-TMXDI), meta-tetramethylxylene diisocyanate (m-TMXDI), 2,4-toluene diisocyanate (2,4-TDI) isomers or mixtures thereof or isophorone diisocyanate (IPDI).
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the diisocyanate is MDI.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the chain extender is a diol or diamine chain extender.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein component (a) polymer forms the soft segment of the polyurethane or polyurethane-urea polymer.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein components (b) and (c) of the polymer form the hard segment of the polyurethane or polyurethane-urea polymer.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the shore hardness of the polymer below the glass transition temperature is in the range of about 82D to about 50D, while the hardness above the glass transition temperature is in the range of about 20D to about 3 OD.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the glass transition temperature is in the range of about 20° C. to about 100° C.
A shape memory polyurethane or polyurethane-urea polymer according to any one of the preceding claims, wherein the glass transition temperature is in the range of about 20° C. to about 60° C.
A shape memory composition which includes a blend of two or more of the shape memory polyurethane or polyurethane-urea polymers defined in any one of the preceding claims or at least one shape memory polyurethane or polyurethane-urea polymer defined in any one of the preceding claims in combination with another material.
A shape memory polyurethane or polyurethane-urea polymer including a reaction product of (a), (b) and (c) as set out under (A) below, a reaction product of (b) and (c) as set out under (B) below or a reaction product of (b) and (d) as set out under (C) below:
A shape memory polyurethane or polyurethane-urea polymer according to claim -112, wherein the chain extender is a silicon-containing chain extender.
Dependencies are inferred from the claim text.