Patent ID: 8686075

Claim:
A polysulfone composition comprising: a molecular weight in the range of from 10,000 to 120,000 Daltons; a phenolic end group content less than 20 meq/kg; a chloride content less than 20 ppm; a transition metal content less than 20 ppm; repeating units derived from reacting one or more phenolic monomers with a dihalo diaryl sulfone; wherein each of the one or more phenolic monomers does not exhibit a half maximal inhibitory concentration (IC 50 ) less than 0.00025M for alpha or beta in vitro estradiol receptors; and wherein when the polysulfone composition has more than zero to 1,000 ppm of one or more residual phenolic monomers or is subjected to conditions effective to provide one or more phenolic degradation products, each of the one or more residual phenolic monomers or phenolic degradation products does not exhibit a half maximal inhibitory concentration (IC 50 ) less than 0.00025M for alpha or beta in vitro estradiol receptors.