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    15.
    发明专利
    未知

    公开(公告)号：DE2450673A1

    公开(公告)日：1976-05-06

    申请号：DE2450673

    申请日：1974-10-25

    Applicant: BASF AG

    Inventor： JESERICH WOLFGANG-DIETER DIPL ,  CORDES CLAUS DIPL CHEM DR ,  SEYDL WOLFGANG DIPL CHEM DR ,  WEISS HANS-PETER DIPL CHEM DR

    IPC: C08G69/16 ,  C08L77/00

    Abstract: Process for the continuous manufacture of polymeric starting materials for high-grade transparent thin sheeting, wherein A. epsilon -CAPROLACTAM IS CONTINUOUSLY AGITATED IN A FIRST REACTION ZONE UNDER POLYAMIDE-FORMING CONDITIONS AT TEMPERATURES OF FROM 240 DEG TO 290 DEG C until at least 20% and preferably at least 35% of the epsilon -caprolactam has reacted, B. MAGNESIUM SILICATE HAVING A PARTICLE SIZE OF LESS THAN 30 mu M IS THEN ADDED TO THE MELT TO GIVE MAGNESIUM SILICATE CONCENTRATIONS IN THE REACTION MIXTURE OF FROM 0.0005 TO 0.5% AND PREFERABLY FROM 0.001 TO 0.

    17.
    发明专利
    未知

    公开(公告)号：DE2443566A1

    公开(公告)日：1976-04-01

    申请号：DE2443566

    申请日：1974-09-12

    Applicant: BASF AG

    Inventor： DOERFEL HELMUT DIPL CHEM DR ,  CORDES CLAUS DIPL CHEM DR

    IPC: C08G69/00 ,  C08G69/04 ,  C08G69/16 ,  C08G69/24

    Abstract: A process for continuous production of polyamides by continuous transport of a mixture of one or more lactams and from 1 to 15% and preferably from 3 to 8% of water and optionally other polyamide-forming compounds such as the salts of dicarboxylic acids and diamines or aminocarboxylic acids through a number of reaction zones under polyamide-forming conditions, said mixture of starting materials being heated in a first reaction zone to temperatures of from 210 DEG to 330 DEG C and preferably from 220 DEG to 280 DEG C, whereupon the polycondensation mixture is adiabatically vented in a further reaction zone and is then polymerized to completion in yet another reaction state to form high molecular weight polyamides. The process is characterized in that A. THE MIXTURE OF STARTING MATERIALS IS HEATED IN THE FIRST REACTION ZONE AT PRESSURES WHICH ARE ABOVE THE RESPECTIVE VAPOR PRESSURES OF THE STARTING MATERIALS AND PREVENT THE FORMATION OF A VAPOR PHASE, SAID HEATING BEING EFFECTED FOR FROM 5 MINUTES TO 2 HOURS AND PREFERABLY FROM 10 MINUTES TO 1 HOUR UNTIL A CONVERSION OF AT LEAST 70% AND PREFERABLY 80% HAS BEEN REACHED; B. THE POLYCONDENSATION MIXTURE IS VENTED IN THE SECOND ZONE TO PRESSURES OF FROM 1 TO 11 BARS AND PREFERABLY FROM 1 TO 6 BARS AND IS THEN IMMEDIATELY HEATED IN A THIRD REACTION ZONE, PREFERABLY TOGETHER WITH THE STEAM FORMED DURING ADIABATIC VENTING, WITH THE APPLICATION OF HEAT AND EVAPORATION OF THE MAJOR PORTION OF THE WATER AT THE SAID PRESSURE OBTAINED BY VENTING OR A LOWER PRESSURE, SAID HEATING BEING CARRIED OUT FOR LESS THAN 10 MINUTES AND PREFERABLY LESS THAN 5 MINUTES AT TEMPERATURES OF FROM 250 DEG TO 350 DEG C and preferably from 260 DEG to 280 DEG C, whereupon C. THE POLYMERIZATION MIXTURE IS SEPARATED FROM THE STEAM IN A FOURTH REACTION ZONE AND IS POLYMERIZED TO COMPLETION IN A FURTHER REACTION STAGE TO FORM HIGH MOLECULAR WEIGHT POLYAMIDES.

    18.
    发明专利
    未知

    公开(公告)号：DE2831335A1

    公开(公告)日：1980-02-07

    申请号：DE2831335

    申请日：1978-07-17

    Applicant: BASF AG

    Inventor： STRAUB FERDINAND DIPL CHEM DR ,  SPOOR HERBERT DIPL CHEM DR ,  CORDES CLAUS DIPL CHEM DR

    IPC: C08F8/00 ,  C08F8/04 ,  C08G18/62 ,  C08F126/10

    Abstract: A process for the preparation of modified poly-N-vinylpyrrolid-2-one containing two identical reactive groups, wherein polyvinylpyrrolidone is treated with complex hydrides, with or without further reaction of the modified polyvinylpyrrolidone with a reactive bifunctional compound, to give a polymer which has a molecular weight at least 2.5 times as great as that of the starting polymer.

    20.
    发明专利
    未知

    公开(公告)号：DE2731816A1

    公开(公告)日：1979-02-01

    申请号：DE2731816

    申请日：1977-07-14

    Applicant: BASF AG

    Inventor： BLINNE GERD DIPL CHEM DR ,  CORDES CLAUS DIPL CHEM DR

    IPC: C08G65/40 ,  C08G75/23 ,  C08G75/20 ,  C08G67/00 ,  C08G65/34

    Abstract: Polyethers, preferably containing sulfone groups, are obtained by a multi-stage condensation process at from 100 DEG to 230 DEG C. from substantially equivalent amounts of bis-(4-hydroxyphenyl)-sulfone and a dichlorobenzene compound in a polar aprotic solvent in the presence of an anhydrous alkali metal carbonate, with or without the addition of a compound which forms an azeotrope.

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