Light-stable aromatic polyesters

Claim 1

A POLYMER CONSISTING ESSENTIALLY OF RECURRING UNITS CONFORMING TO THE FOLLOWING STRUCTURE: -O-(2-X,6-Y-1,4-PHENYLENE)-(Z)N-(3-X,5-Y-1,4-PHENYLENE)WHEREIN AR IS SELECTED FROM THE GROUP CONSISTING OF METAAND PARA-ARYLENE AND MIXTURES THEREOF; N IS A CARDINAL NUMBER OF FROM 0 TO 1; X IS SELECTED FROM THE GROUP CONSISTING OF HALOGEN, ALKYL OF UP TO SIX CARBON ATOMS, AND ALKOXY OF UP TO SIX CARBON ATOMS; Y IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, HALOGEN, ALKYL OF UP TO SIX CARBONS ATOMS AND ALKOXY OF UP TO SIX CARBON ATOMS WITH THE PROVISO THAT X IS HALOGEN WHEN Y IS HYDROGEN; AND Z REPRESENTS A MEMBER OF THE GROUP CONSISTING OF -C(-R)(-R'')-, -O-, -SO2- AND >C<(-R"-) OOC-AR-COWHEREIN R AND R'' ARE SELECTED GROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL OF UP TO SIX CARBON ATOMS, AND R" IS ALKYLENE OF UP TO SIX CARBON ATOMS, SAID POLYMER HAVING AN INHERENT VISOCITY OF AT LEAST 0.5 WHEN MEASURE AT 30*C. AS A SOLUTION OF THE POLYMER IN A 40% SYM-TETRACHLOROETHANE/60% PHENOL BY WEIGHT SOLVENT MIXTURE AT A CONCENTRATION OF 0.5 GM. OF POLYMER PER 100 ML. OF SOLUTION.