Patent ID: 8357767

Claim:
A polyurethane or polyurethane/urea composition which has a tensile strength greater than 10 MPa, a modulus of elasticity greater than 400 MPa and an elongation at break greater than 150% at a temperature of between 0° C. and 60° C. and at a relative humidity of between 0% and 100%, wherein the polyurethane or polyurethane/urea composition is derived from diisocyanate, and a polyol having the formula: wherein only one of h or k can be zero or both are integers other than zero, j is zero or an integer other than zero, R 4 and R 8 are independently selected from the group consisting of hydrogen, hydroxylalkyl, aminoalkyl, and carboxyalkyl, R 5 , R 6 and R 7 cannot be hydrogen, but are independently a linear or branched alkyl, alkenyl, aminoalkyl, alkoxy or aryl, R 5 and R 7 are the same or different and distributed alternately, randomly or as blocks within the polyol structure; wherein the polyurethane or polyurethane/urea composition comprises one or more chain extenders, at least one of which is a linear aliphatic glycol having a molecular weight less than 350, and wherein the polyurethane or polyurethane/urea composition is biocompatible and biodegradable.