abstract |
A POLYESTER OF RECURRING MOIETIES OF FORMULAE I, II AND III: -(O-1,4-PHENYLENE)-CO)P (I) -(CO-PHENYLENE-CO)Q- (II) -(O-PHENYLENE-((X)M-PHENYLENE)N-O)R- (III) WHEREIN X IS -O- OR -SO2-; M IS 0 OR 1; N IS 0 OR 1; AND P, Q AND R ARE PREFERABLEY PRESENT IN CERTAIN DEFINED RATIOS. |