63.
    发明专利
    未知

    公开(公告)号:DE19814529A1

    公开(公告)日:1999-10-07

    申请号:DE19814529

    申请日:1998-04-01

    Applicant: BASF AG

    Abstract: According to the inventive method for producing polyalkylene arylates, an aromatic dicarboxylic acid or its esters or ester-forming derivatives is/are esterified or transesterified with a molar excess of an aliphatic dihydroxy compound and the resulting transesterification or esterification product is polycondensed. The invention is characterised in that the prepolymer is polycondensed with a viscosity number (VZ) of

    Method for the continuous production of polybutylene terephthalate from terephthalic acid and butanediol

    公开(公告)号:CZ295286B6

    公开(公告)日:2005-06-15

    申请号:CZ20014648

    申请日:2000-06-09

    Applicant: BASF AG

    Abstract: The present invention relates to a process for the continuous preparation of polybutylene terephthalate from terephthalic acid and 1,4-butanediol, comprising the following stages: a) direct esterification of terephthalic acid with 1,4-butanediol in a reactor cascade of at least two reactors b) pre-condensation of the esterification product obtained in the stage a), c) polycondensation of the pre-condensate obtained in the stage b), whereby the temperature of the reactor cascade in the stage a) is progressively decreased during operation thereof.

    65.
    发明专利
    未知

    公开(公告)号:DE50007696D1

    公开(公告)日:2004-10-14

    申请号:DE50007696

    申请日:2000-06-28

    Applicant: BASF AG

    Abstract: In a process for the continuous preparation of polybutylene terephthalate from terephthalic acid and 1,4-butanediol comprising:a) direct esterification of terephthalic acid with 1,4-butanediol in a reactor cascade comprising at least two reactors,b) precondensation of the esterification product obtained in stage a), andc) polycondensation of the precondensate obtained in stage b),the reaction pressure decreases and the temperature does not increase along the reactor cascade in stage a).

    66.
    发明专利
    未知

    公开(公告)号:AT275595T

    公开(公告)日:2004-09-15

    申请号:AT00951286

    申请日:2000-06-28

    Applicant: BASF AG

    Abstract: In a process for the continuous preparation of polybutylene terephthalate from terephthalic acid and 1,4-butanediol comprising:a) direct esterification of terephthalic acid with 1,4-butanediol in a reactor cascade comprising at least two reactors,b) precondensation of the esterification product obtained in stage a), andc) polycondensation of the precondensate obtained in stage b),the reaction pressure decreases and the temperature does not increase along the reactor cascade in stage a).

    67.
    发明专利
    未知

    公开(公告)号:ES2209904T3

    公开(公告)日:2004-07-01

    申请号:ES00940355

    申请日:2000-06-09

    Applicant: BASF AG

    Abstract: The invention relates to a method for the continuous production of polybutylene terephthalate from terephthal acid and 1,4-butane diole, comprising the following stages: a) direct esterification of terephthal acid with 1,4-butane diole in a reactor cascade of at least two reactors b) pre-condensation of the esterification product obtained in stage a), c) polycondensation of the pre-condensate obtained in stage b), whereby the temperature of the reactor cascade in stage a) is progressively decreased during its operation.

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