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    PRODUCTION OF MODIFIED POLYALKYLENE TEREPHTHALATES
    3.
    发明专利
    PRODUCTION OF MODIFIED POLYALKYLENE TEREPHTHALATES 未知

    公开(公告)号：CA1050693A

    公开(公告)日：1979-03-13

    申请号：CA204585

    申请日：1974-07-11

    Applicant: BASF AG

    Inventor： STREHLER HUGO ,  BEER LUDWIG ,  KUNDE JOACHIM ,  MATTHIES HANS G ,  POHLEMANN HEINZ

    IPC: C08G63/00 ,  C08G63/181 ,  C08G63/183 ,  C08G63/78 ,  C08G63/18 ,  C08G63/22

    Abstract: A process for the production of a modified polyalkylene terephthalate from the radical of terephthalic acid and the radical of a glycol of two to six carbon atoms in which from 1 to 50 mole % of the terephthalic acid radical has been replaced by an aliphatic dicarboxylic acid radical of four to twelve carbon atoms. The aliphatic dicarboxylic acid is esterified by heating with the glycol in a molar ratio of from 1:1.2 to 1:1.8 at a temperature of from about 5 to 20.degree.C below the boiling point of the glycol until the degree of esterification is from 90 to 95 mole % based on the aliphatic dicarboxylic acid; a dialkyl terephthalate is transesterified with the glycol in a molar ratio of from 1:1.2 to 1:2 in the presence of a catalyst in an amount of from 0.01 to 0.2% by weight base on dialkyl-terephthalate by heating to a temperature of from 130.degree. to 240.degree.C at atmospheric pressure until at least 95% of the alkoxy groups present have been eliminated. The esterification product is mixed with the transesterification product and polycondensation is carried out at a temperature of from 240.degree. to 290.degree.C and a pressure of from 0.1 to 760 mm, in the presence of a catalyst in an amount of from 0.01 to 0.2% by weight based on the polyester. The polyester obtained is suitable for example for mouldings or as an adhesive.

    CONTINUOUS MANUFACTURE OF LINEAR POLYESTERS
    5.
    发明专利
    CONTINUOUS MANUFACTURE OF LINEAR POLYESTERS 未知

    公开(公告)号：CA1038996A

    公开(公告)日：1978-09-19

    申请号：CA237205

    申请日：1975-10-07

    Applicant: BASF AG

    Inventor： REBHAN JOERG ,  MATTHIES HANS G

    IPC: C08G63/00 ,  C07C69/82 ,  C08G63/78 ,  C08G63/18 ,  C08G63/60

    Abstract: An improved process for the continuous manufacture of linear high molecular weight polyesters by direct esterification of terephthalic acid with excess glycols in a medium comprising terephthalic acid glycol esters or their oligomers, under superatmospheric pressure at temperatures above 200.degree.C, followed by polycondensation in the presence Or catalysts at from 260 to 290.degree.C. The improvement is that the mixture fed to the esterification contains terephthalic acid and glycols in the molar ratio of 1:1.15 to 1:1.5 and that during the esterification from 20 to 30% by weight Or the excess of glycols over the molar ratio terephthalic acid:glycols = 1:1 are continuously distilled from the reaction mixture.

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