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    CONTINUOUS MANUFACTURE OF POLYAMIDES
    3.
    发明专利
    CONTINUOUS MANUFACTURE OF POLYAMIDES 未知

    公开(公告)号：AU7928175A

    公开(公告)日：1976-09-23

    申请号：AU7928175

    申请日：1975-03-19

    Applicant: BASF AG

    Inventor： MERTES FRIEDERICH ,  DOERFEL HELMUT ,  HEIL EDUARD ,  CORDES CLAUS

    IPC: C08G69/00 ,  C08G69/04 ,  C08G69/28 ,  C08G69/36 ,  G01N30/91 ,  C08G20/02

    Abstract: An improved process for the continuous manufacture of polyamides by continuously conveying the aqueous solution of a salt of essentially equivalent amounts of a diamine, or of a mixture of several diamines, and of a dicarboxylic acid, or of a mixture of several dicarboxylic acids, or of mixtures of such salts with lactams and/or aminocarboxylic acids, through several reaction zones under polyamide-forming conditions, wherein the mixture of starting materials is heated, in a first reaction zone, to from 200 DEG to 300 DEG C, preferably from 220 DEG to 280 DEG C, at pressures which are above the corresponding saturation vapor pressure of water and prevent the formation of a vapor phase, the pressure action on the polycondensation mixture is released in a second reaction zone and condensation of the mixture, to form high molecular weight polyamides, is then completed in further reaction stages. According to the invention, A. THE MIXTURE OF STARTING MATERIALS IS HEATED, IN THE FIRST REACTION ZONE, UNTIL THE POLYCONDENSATION CONVERSION IS AT LEAST 80% AND PREFERABLY 90%, B. IN THE SECOND ZONE THE PRESSURE ACTING ON THE POLYCONDENSATION MIXTURE IS RELEASED, ADIABATICALLY, TO LEVELS OF NOT LESS THAN 3 ATMOSPHERES, PREFERABLY NOT LESS THAN 5 ATMOSPHERES, AND NOT MORE THAN 20 ATMOSPHERES, PREFERABLY NOT MORE THAN 15 ATMOSPHERES, SO AS TO REACH TEMPERATURES BELOW 215 DEG C, preferably 210 DEG C, c. the polycondensation mixture is then heated in a third reaction zone, comprising a heat exchanger consisting of heat exchange elements connected in parallel, to from 220 DEG to 330 DEG C, preferably from 250 DEG to 300 DEG C, in the course of less than 5 minutes and preferably less than 1 minute, the heating being carried out preferably in the presence of the water vapor formed during the adiabatic release of the pressure (in stage b), with application of heat and evaporation of the bulk of the water, at the pressure level to which the pressure has previously been released or at a lower pressure, and D. IN FURTHER REACTION STAGES, THE CONDENSATION IS COMPLETED, UNDER THE CONDITIONS PREVAILING AT THE END OF THE THIRD REACTION ZONE AND, FINALLY, BY CONVENTIONAL METHODS, TO FORM HIGH MOLECULAR WEIGHT POLYAMIDES.

    POLYAMIDE FILM AND PROCESS FOR ITS MANUFACTURE
    7.
    发明专利
    POLYAMIDE FILM AND PROCESS FOR ITS MANUFACTURE 未知

    公开(公告)号：CA1051624A

    公开(公告)日：1979-04-03

    申请号：CA237601

    申请日：1975-10-10

    Applicant: BASF AG

    Inventor： ZAHN ERWIN ,  CORDES CLAUS ,  ZAHRADNIK FRANZ ,  WEISS HANS-PETER

    IPC: B29C47/88 ,  C08L77/00 ,  B29D7/10

    Abstract: A process for the manufacture of flat film from poly-.epsilon.-caprolactam or its copolymers containing more than 70% of caprolactam units, wherein a melt of polycaprolactam of relative viscosity from 2.4 to 3.3, preferably from 2.5 to 2.8, which contains from 0.001 to 0.01%, of uniformly and finely distributed crystalline magnesium silicates of particle size less than 30 .mu., is extruded through a slit die onto a chill roller and the melt issuing from the slit die is drawn off the chill roller at a speed greater than 30 m/minute, to give a film less than 50 .mu. thick.

    PREPARATION OF TERPOLYMERS
    10.
    发明专利
    PREPARATION OF TERPOLYMERS 未知

    公开(公告)号：CA1150897A

    公开(公告)日：1983-07-26

    申请号：CA335253

    申请日：1979-09-10

    Applicant: BASF AG

    Inventor： DENZINGER WALTER ,  CORDES CLAUS

    IPC: C08F220/00 ,  C08F210/14 ,  C08F220/04 ,  C08F222/06 ,  C08F122/06

    Abstract: O. Z. 0050/033409 Terpolymers which have Fikentscher K-values of from 8 to 100 and comprise 50 mole percent of maleic anhydride units, from 35 to 45 mole percent of 2,4,4'-trimethylpent-1-ene units and from 5 to 15 mole percent of 2,4,4'-trimethylpent-2-ene units, and processes for their preparation by polymerizing 50 parts by weight of maleic anhydride, from 35 to 180 parts by weight of 2,4,4'trimethylpent-1-ene and from 0.6 to 6 parts by weight of 2,4,4'-trimethylpent-2-ene per part by weight of 2,4,4'trimethylpent-1-ene employed, in the presence of a freeradical initiator at from 60 to 200.degree.C and a pressure of from 1 to 20 bar, and separating the terpolymers from the unconverted monomers.

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