31.
    发明专利
    未知

    公开(公告)号:DE3820362A1

    公开(公告)日:1990-03-15

    申请号:DE3820362

    申请日:1988-06-15

    Applicant: BASF AG

    Abstract: Process for the continuous preparation of linear thermoplastic polyesters, in which a) a transesterification or esterification product of aliphatic and/or aromatic dicarboxylic acids having a molecular weight /l, and in step c), the precondensate is further condensed at a temperature of from 240 to 290 DEG C under a pressure of from 0.5 to 20 mm Hg and a residence time of from 10 to 40 minutes, giving polyesters which are suitable for granulation.

    34.
    发明专利
    未知

    公开(公告)号:DE3804159A1

    公开(公告)日:1989-08-24

    申请号:DE3804159

    申请日:1988-02-11

    Applicant: BASF AG

    Abstract: The polyaryl ether ketones are built up essentially from (A) 55 - 95 mol % of recurring units of the formula I or ring-substituted C1-C6-alkyl, C1-C6-alkoxy, aryl, chlorine or fluorine derivatives thereof, where s and t are each 0, 1, 2 or 3, and Q and T may each be -O- or -CO-, and (B) 5 - 45 mol % of recurring units of the formula II in which Ar , Ar , Ar , Ar and Ar , independently of one another, are each a phenylene, biphenylene or naphthylene group or a C1-C6-alkyl, C1-C6-alkoxy, aryl, chlorine or fluorine derivative thereof, Q' and T' may each be -O- or -CO-, and s' and t' are each 0, 1, 2 or 3, with the proviso that at least one of the substituents Ar , Ar , Ar , Ar and Ar is a biphenylene or naphthylene group or a C1-C6-alkyl, C1-C6-alkoxy, aryl, chlorine or fluorine derivative of such a group, and not all the parameters s, t, s' and t' are simultaneously 0 if Ar is a biphenylene group.

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