The polymer has a Tg of 115??? C. The polymer is molded to give flexure bars with a notched Izod impact strength of 18 ft-lb/in. at 23??? C. and 14 ft-lb/in. at -40??? C. Also, molded bars are unaffected after exposure for 24 hours to such solvents as methyl isobutyl ketone, ethyl acetate, acetone, gasoline, and ethanol, indicating unusually good solvent resistance.