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    PRODUCTION OF POLYSTYRENE
    1.
    发明专利
    PRODUCTION OF POLYSTYRENE 失效

    公开(公告)号：JPH1045811A

    公开(公告)日：1998-02-17

    申请号：JP11682097

    申请日：1997-05-07

    Applicant: BASF AG

    Inventor： GAUSEPOHL HERMANN DR ,  FISCHER WOLFGANG DR ,  LOTH WOLFGANG DR ,  THIELE REINER PROF DR

    IPC: C08F2/00 ,  B01J19/24 ,  C08F2/06 ,  C08F12/04 ,  C08F112/08

    Abstract: PROBLEM TO BE SOLVED: To provide a method for the continuous anionic polymerization of styrene which is economical in aspects of practicable space time yield and plant cost and has the possibility of an influence upon a desired molecular weight distribution of the polymer within a relatively wide range without carrying out multiple metering and feeding of the monomer or an initiator to form only an extremely small amount of a low-molecular weight polymer. SOLUTION: This method for producing a polystyrene comprises continuously carrying out the anionic polymerization of styrene monomer by using a catalyst based on a metal alkyl. In this case, the styrene monomer is fed to a circulating type reactor 1, arranged as a loop type closed pipe and operated at an essentially constant temperature. Furthermore, the circulating speed and residence time of a reactional mixture are set so that the conversion rate of the styrene monomer may attain at least 50% and the polymerization may be completed in a tubular reactor 2 without essentially causing any back mixing.

    Continuous preparation of polyamides from aminonitriles
    3.
    发明专利
    Continuous preparation of polyamides from aminonitriles 未知

    公开(公告)号：CZ200391A3

    公开(公告)日：2003-06-18

    申请号：CZ200391

    申请日：2001-07-10

    Applicant: BASF AG

    Inventor： BASSLER PETER DR ,  WINTERLING HELMUT DR ,  FISCHER ROLF-HARTMUTH DR ,  LOTH WOLFGANG DR

    IPC: C08G69/00 ,  C08G69/04 ,  C08G69/08 ,  C08G69/16

    Abstract: The continuous process for preparing a polyamide by reacting at least one aminonitrile with water comprises:(1) reacting at least one aminonitrile with water in the presence of an organic liquid diluent at from 90 to 400° C. and from 0.1 to 35x10 Pa in a flow tube containing a Brönsted acid catalyst selected from a beta-zeolite catalyst, a sheet-silicate catalyst or a titanium dioxide catalyst comprising from 70 to 100% by weight of anatase and from 0 to 30% by weight of rutile and in which up to 40% by weight of the titanium dioxide may be replaced by tungsten oxide, to obtain a reaction mixture,(2) further reacting the reaction mixture at from 150 to 400° C. and a pressure which is lower than the pressure in stage 1 in the presence of a Brönsted acid catalyst selected from a beta-zeolite catalyst, a sheet-silicate catalyst or a titanium dioxide catalyst comprising from 70 to 100% by weight of anatase and from 0 to 30% by weight of rutile and in which up to 40% by weight of the titanium dioxide may be replaced by tungsten oxide, the temperature and pressure being selected so as to obtain a first gas phase and a first liquid phase or a first solid phase or a mixture of first solid and first liquid phases and so that the first gas phase is separated from the first liquid phase or first solid phase or from the mixture of first liquid and first solid phases, and(3) admixing the first liquid or the first solid phase or the mixture of first liquid and first solid phases with a gaseous or liquid phase comprising water at from 150 to 370° C. and from 0.1 to 30x10 Pa, to obtain a product mixture.

    6.
    发明专利
    未知

    公开(公告)号：DE19523587A1

    公开(公告)日：1997-01-02

    申请号：DE19523587

    申请日：1995-06-29

    Applicant: BASF AG

    Inventor： LOTH WOLFGANG DR ,  KNOLL KONRAD DR ,  GAUSEPOHL HERMANN DR

    IPC: C08F2/00 ,  C08F12/06 ,  C08F12/00

    Abstract: The invention concerns a process for the anionic polymerization or copolymerization of vinyl aromatic compounds such as styrene in solution with an initial monomer concentration of between 40 and 100 wt.% under non-isothermic conditions, preferably in a pipe reactor or pipe assembly reactor, of which a substantial part is provided with means preventing the exchange of heat with the environment, toluene, methylcyclohexane, ethylbenzene or Decalin preferably being used as solvent. The temperature of the polymer solution leaving the reaction chamber is at least 170 DEG C. A styrene polymer containing fewer than 50 ppm monomers is produced.

    8.
    发明专利
    未知

    公开(公告)号：DE59203581D1

    公开(公告)日：1995-10-12

    申请号：DE59203581

    申请日：1992-12-05

    Applicant: BASF AG

    Inventor： BESECKE SIEGMUND DR ,  DECKERS ANDREAS DR ,  LOTH WOLFGANG DR ,  LAUKE HARALD DR

    IPC: C08F8/32 ,  C08F8/48

    Abstract: A polymer essentially containing units of the formula I in which R and R are hydrogen or methyl, and R is C4-C18-alkyl, C5-C8-cycloalkyl, C6-C10-aryl or C6-C10-aryl-C1-C4-alkyl, where these radicals, with the exception of the C4-C18-alkyl radicals, may be up to trisubstituted by radicals selected from the group consisting of C1-C4-alkyl, C1-C4-alkoxy and halogen, and containing less than or equal to 0.40 equivalent of carboxyl and anhydride groups per kilogram of polymer and having an inherent colour (measured as yellowness index) of less than or equal to 2.0, obtainable by reacting a polymer based on C1-C20-alkyl esters of (meth)acrylic acid with a primary amine of the formula II R NH2 II by removing the alcohol formed during the reaction from the reaction mixture.

    9.
    发明专利
    未知

    公开(公告)号：DE19701865A1

    公开(公告)日：1998-07-23

    申请号：DE19701865

    申请日：1997-01-21

    Applicant: BASF AG

    Inventor： FISCHER WOLFGANG DR ,  BAUMGAERTEL MICHAEL DR ,  GAUSEPOHL HERMANN DR ,  HASENBEIN NORBERT DR ,  KICK ROLF ,  LOTH WOLFGANG DR ,  WARZELHAN VOLKER DR

    IPC: B01J19/18 ,  B01J19/24 ,  C08F279/02 ,  B29B15/00 ,  C08F212/08 ,  C08F236/06

    Abstract: The invention concerns a process for continuously producing impact-resistant modified thermoplastic moulding compounds which contain a rubber-elastic soft phase dispersed in a vinylaromatic hard matrix. In a first reaction zone the rubber necessary for forming the soft phase is polymerized anionically in solution substantially without re-mixing until the reaction is complete. The rubber is fed, directly or after the addition of a breaking or coupling agent, to a second reaction zone in which it is polymerized until the phases are inverted with the addition of an amount of vinylaromatic monomer sufficient for phase inversion and a further anionic initiator. In a third reaction zone polymerization is terminated anionically with as many vinylaromatic monomers as are required to form the impact-resistant modified thermoplastic moulding compound.

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