Unsaturated polyester including as reactants benzene tricarboxylic acid and a glycol monoalkyl ether

Claim 1

AN UNSATURATED POLYESTER CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF (A) BENZENE TRICARBOXYLIC ACID SELECTED FROM THE CLASS CONSISTING OF TRIMELLITIC ACID, TRIMELLITIC ANHYDRIDE, TRIMESIC ACID, HEMIMELLITIC ACID AND HEMIMELLITIC ANHYDRIDE, (B) ALKYLENE GLYCOL MONOALKYL ETHER CONTAINING 1 TO 8 ETHER GROUPS, 2-3 CARBON ATOMS IN EACH ALKYLENE UNIT AND 1-8 CARBON ATOMS IN THE ALKYL GROUP, (C) ALKENEDIOIC ACID SELECTED FROM THE CLASS CONSISTING OF MALEIC ACID, FUMARIC ACID, CITRACONIC ACID AND ANHYDRIDES THEREOF, AND (D) ALKYLENE GLYCOL HAVING 2-8 CARBON ATOMS, ALL REACTED UNDER POLYESTERIFICATION CONDENSATION REACTION CONDITIONS WITH CONTINUOUS REMOVAL OF WATER PRODUCED IN THE REACTION, SAID REACTANTS BEING CHARGED TO THE CONDENSATION ZONE, IN A MOLE RATIO BASIS OF: BENZENE ACID TO ETHER, ABOUT 10:1-1:1; BENZENE ACID TO ALKENEDIOIC ACID, 9:1-1:9; AND ABOUT SUFFICIENT GLYCOL TO REACT WITH REMAINING FREE-CARBOXYL GROUPS.