Production of synthetic polyester filaments

摘要

Polyesters, spinnable into fibres having a reduced tendency to pill (see Division B5), are made by polymerizing an ester of a dihydroxy compound and a dicarboxylic acid in the presence of an organic compound having the grouping in which M is antimony, chromium, iron, tin, titanium, vanadium or zirconium, the metalorganic compound being present in an amount of at least 0.1 mole per cent. based on the number of mols. of metal atom per 100 mols. of dicarboxylate radicals. Linkages from the metal atom through oxygen atom to the polyester chains are then treated. The metalorganic compound may be (a) an ester of formula M-(O-R)n where R is an organic radical and n is the valency of the metal; (b) a metal chelate derived e.g. from acetonylacetone, benzoylacetone, acetoacetic ester, salicylaldehyde, benzoyl pyruvic acid, o-hydroxyacetone or triethanolamine; (c) a salt of an organic acid, e.g. acetic, phenylacetic, lactic, salicyclic, citric, glycolic or tartaric acid; (d) an ester-chelate compound of formula (RO)m-M-(OCOR1)m1, where m and m1 are integers whose sum is equal to the valency of the metal and R and R1 are organic radicals; or (e) a compound of formula (R)m-M-(OCOR1)m1. The dicarboxylic acid is preferably terephthalic acid or a mixture thereof with up to 25 mole per cent. of adipic, sebacic, isophthalic, bibenzoic, hexahydroterephthalic diphenoxyethane-4, 41-dicarboxylic, p, p1-carbonyldibenzoic or p, p1-sulphonyldibenzoic acid. The dihydroxy compound may be a glycol of formula: where p and q are integers and Y is a cycloaliphatic group, an aromatic group, an oxy group or an arylenedioxy group. The polyesterification mixture may also include catalysts, delustrants (e.g. titanium dioxide) or colour inhibitors (e.g. phosphoric acid). Examples describe the manufacture of metal-modified polyethylene terephthalates. Specification 578,074 is referred to.