Abstract: A polyester resin is disclosed which is resistant to splitting during transverse orientation during conventional film manufacturing. The polyester resin contains up to 7 weight percent, based uon the total weight of the resin, of(A) a dicarboxylic acid component consisting essentially of 1,4-cyclohexandeicarboxylic acid having a trans isomer content of at least 70%(B) a glycol component consisting essentially of(1) 1,4-cyclohexanedimethanol, and(2) from about 15 to about 50 weight percent, based on the weight of the polyesterether, of polytetramethyleneether glycol having a molecular weight of about 500 to about 1100 and(c) from about 0.1 to about 1.5 mole percent, based on the mole percentage of the acid or glycol component, of a branching agent having at least three COOH or OH functional groups and from 3 to 60 carbon atoms.

Abstract: A process for preparing an iodine stainable polyester polarizer film which comprises:(a) extruding a moving molten web of polyester film; and(b) quenching said moving web to solidify it in a substantially amorphous form; and(c) applying an anchor coating to at least a portion of the surface of said film wherein said anchor coating improves adhesion of polyvinyl alcohol to polyester film; and(d) applying a coating of a dispersed aqueous composition of polyvinyl alcohol to at least a portion of the surface of said film; and(e) stretching said moving web in a direction transverse to the direction of motion while heating said web at a temperature of from about its glass transition temperature to about 160.degree. C.; and(f) crystallizing said moving web by heating it to a temperature in the range of 130.degree. C. to 240.degree. C. without stretching said web; and(g) cooling said web to substantially ambient atmospheric temperature.