Patent ID: 8623971

Claim:
A polyethersulfone having Tg greater than about 225° C. and a notched Izod value greater than about 1 ft-lb/in, said polyethersulfone consisting of from about 5 mol % to about 25 mol % structural units of formula 1B; and from greater than about 75 mol % to about 95 mol % structural units of formula 2 wherein R 2 and R 3 are independently at each occurrence a halogen atom, a nitro group, a cyano group, a C 1 -C 12 aliphatic radical, C 3 -C 12 cycloaliphatic radical, or a C 3 -C 12 aromatic radical; R 4 is C 1 -C 20 aliphatic radical, a C 3 -C 20 cycloaliphatic radical, or a C 3 -C 20 aromatic radical ; and n, m, q are independently at each occurrence integers from 0 to 4.