A METHOD FOR THE MANUFACTURE OF HIGH MODULUS OXYBENZOYL COPOLYESTER FIBERS

摘要

A method for the manufacture of high modules oxybenzoyl copolyester fibers which comprises: making a fiber from a moldable, film forming polyester having a molecular weight in the range of from 2,000-200,000 an a melting point of at least 250degrees C and comprising recurring moieties of the group of formulae I, II and III.wherein n is 0 or 1; x, y and z are integers; y:z=from 10:15 to 15:10, x:y and x:z=from 1:100 to 100:1; x+y+z=from 30 to 600; and the carbonyl group of formula I is meta and/or para to the oxy group thereof; the carbonyl groups of formula II are meta and/or para phi to each other; and the oxy atoms of formula III are meta and/or para to each other; with more than 50% of the total of said moieties having said mentioned groups therein of para configuration; heating the fiber at a temperature in the range of from about 250degrees C to about 500degrees C and stretching the fiber to increase the length thereof from about 10% to about 400% to increase the tensile strength and Young''s modulus.