초록 ▼

The present invention relates to a material having improved mechanical properties, clarity, processability and/or degradation resistance comprising a polyurethane elastomeric composition which includes a soft segment derived from at least one polysiloxane macrodiol and at least one polyether and/or

The present invention relates to a material having improved mechanical properties, clarity, processability and/or degradation resistance comprising a polyurethane elastomeric composition which includes a soft segment derived from at least one polysiloxane macrodiol and at least one polyether and/or polycarbonate macrodiol. This material can function as a degradation resistant material or biomaterial and is particularly useful in the manufacture of medical devices, articles or implants which contact living tissues or bodily fluids. The present invention also provides a polyurethane elastomeric composition which includes a soft segment derived from about 60 to 98 wt % of at least one polysiloxane macrodiol and about 2 to 40 wt % of at least one polyether and/or polycarbonate macrodiol and processes for its preparation.

대표청구항 ▼

[ What is claimed is:] [1.]1. A polyurethane elastomeric composition comprising a hard segment and a soft segment, wherein the soft segment is formed from (a) about 2 wt. % to about 40 wt. % of at least one polyether, about 2 wt. % to about 40 wt. % of at least one polycarbonate macrodiol, or about

[ What is claimed is:] [1.]1. A polyurethane elastomeric composition comprising a hard segment and a soft segment, wherein the soft segment is formed from (a) about 2 wt. % to about 40 wt. % of at least one polyether, about 2 wt. % to about 40 wt. % of at least one polycarbonate macrodiol, or about 2 wt. % to about 40 wt. % of a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol, wherein the polyether macrodiol is a compound of the formula:m is an integer of 4 or more; andn is an integer from 2 to 50; and (b) about 60 wt. % to about 98 wt. % of at least one polysiloxane macrodiol of formula (I):whereinR.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; andn is an integer from 1 to 100;wherein the hard segment is present in about 30 wt. % to about 60 wt. % of the polyurethane elastomeric composition and wherein the soft segment is present in about 40 wt. % to about 70 wt. % of the polyurethane elastomeric composition.