Verfahren zum Veredeln von hochmolekularen Polyestern zur Verbesserung ihrer Eigenschaften, insbesondere der Anfaerbbarkeit

摘要

1,043,963. Treating copolyester filaments and films. FARBWERKE HOECHST A.G. April 6, 1964 [April 4, 1963], No. 14115/64. Addition to 903,913. Heading B5B. The process of the parent Specification (in which filaments, films &c. of linear highly polymeric polyesters of polybasic acids with polyhydric alcohols are treated with a nitrogenfree organic compound capable of reacting chemically with the polyesters are treated at a temperature above 200‹ C. and for a period within the range of 10-4 to 1 second such that only the surfaces of the filaments or films enter into the chemical reaction) is modified in that the filaments or films are composed of copolyesters in which at least a major proportion of the polyester component is an ester of a polybasic acid and a polyhydric alcohol, the treatment temperature is not below 180‹ C. and the reaction period is within the range of 10-3 to 10 seconds. The copolyester contains a major proportion of polyester units derived from a cyclic dicarboxylic acid and/or an aliphatic or cycloaliphatic dihydroxy compound. A component of the copolyester may be a polyester unit derived from a hydroxycarboxylic acid. The major component of the polyester may be polyethylene terephthalate and the minor component may be an ester of a cyclic dicarboxylic acid (other than terephthalic acid) with an aliphatic or cycloaliphatic dihydroxyl compound (other than ethylene glycol), and/or a hydroxy-carboxylic acid, the proportion of the components of the polyester other than the terephthalic acid being 0.5 to 20% of the weight of terephthalic acid. The nitrogen-free organic compound may contain one or more reactive terminal groups such as carboxyl, hydroxyl, phosphonic acid or sulphonic acid. bound to an aliphatic or aromatic radical. The nitrogen-free organic compound may contain a high molecular weight ester and/or ether group and at least one hydroxyl group. The compound may be in a gaseous or liquid state during the treatment. The filaments or films may be stretched before the treatment process and allowed to shrink to a predetermined degree during the treatment. The treatment period may be 10-3 to 1 second and the treatment temperature 180‹ to 240‹ C.