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    13.
    发明专利
    未知

    公开(公告)号：DE19640793A1

    公开(公告)日：1998-04-16

    申请号：DE19640793

    申请日：1996-10-02

    Applicant: BASF AG

    Inventor： KROENER HUBERTUS DR ,  KLANIG WOLFGANG ,  MORRISON BRADLEY RONALD DR ,  KLOSTERMANN RAINER DR ,  SCHOEPKE HOLGER DR ,  KASTENHUBER WALTER

    IPC: B01J19/18 ,  C08F2/00 ,  C08F2/22 ,  C08F12/08 ,  C08F14/06 ,  C08F14/08 ,  C08F18/08 ,  C08F20/00 ,  C08F36/06 ,  C08F20/18 ,  C08F20/06 ,  C08F20/44 ,  C08F20/56

    Abstract: In a process for the preparation of homo or copolymers of at least one polymerisable monomer consisting of styrene, butadiene, vinyl chloride, vinyl acetate, vinylidene chloride, alkyl(meth)acrylate, meth(acrylic)acid, (meth)acrylonitrile or (meth)acrylamide by an emulsion polymerisation technique, reaction is carried out at at least 40 degrees C in the presence of a dispersing agent and a radical initiator such that at least 85 wt.% of the polymer is prepared by (a) mixing water, inert solvent and optionally dispersing agent and optionally a portion of the monomer, (b) adding initiator and (c) adding the rest of the monomer, optionally in the form of an emulsion with further water and optionally further dispersing agent or processing aids. Steps (a) and (b) or (b) and (c) may be carried out together at 40-120 degrees C and the resulting dispersion from each step or all the steps is recirculated around a flow loop external to the reaction vessel containing a low shear pump and a heat exchanger exhibiting a laminar flow profile. An apparatus for carrying out the reaction is also claimed and comprises means for storing and feeding reactants and processing aids, a reactor vessel with a heating/cooling mantle and means for draining, an external flow loop with a low shear pump and heat exchanger exhibiting a laminar flow profile and necessary connecting pipes.

    Controlled production of aqueous polymer dispersion
    17.
    发明专利
    Controlled production of aqueous polymer dispersion 未知

    公开(公告)号：DE19735222A1

    公开(公告)日：1999-02-18

    申请号：DE19735222

    申请日：1997-08-15

    Applicant: BASF AG

    Inventor： FISCHER MICHAEL DR ,  SUTORIS HEINZ FRIEDRICH DR ,  MORRISON BRADLEY RONALD DR ,  DURANT YVON DR

    IPC: C08F2/22 ,  C08F4/00 ,  C08F4/34 ,  C08F4/36

    Abstract: A method of radical-initiated emulsion polymerisation for the production of aqueous polymer dispersions comprises emulsifying unsaturated monomer(s) in aqueous media with the aid of dispersants and then polymerising with a radical initiator in presence of a stable N-oxyl radical, at above 100 deg C and at a pressure above the vapour pressure of the reaction mixture. The initiators used comprise peroxides, hydroperoxides and/or azo compounds with a molal solubility at 25 deg C and 1 bar in water which is greater than or equal to that of tert.-butyl hydroperoxide and with a dissociation temperature of less than 100 deg C in the polymerisation mixture. Also claimed are aqueous polymer dispersions obtained by this process.

    PREPARATION OF EMULSION HOMO- AND COPOLYMERS AND DEVICE THEREFORE
    18.
    发明专利
    PREPARATION OF EMULSION HOMO- AND COPOLYMERS AND DEVICE THEREFORE 未知

    公开(公告)号：CA2215556A1

    公开(公告)日：1998-04-02

    申请号：CA2215556

    申请日：1997-10-01

    Applicant: BASF AG

    Inventor： KROENER HUBERTUS DR ,  KLANIG WOLFGANG ,  MORRISON BRADLEY RONALD DR ,  KLOSTERMANN RAINER DR ,  SCHOEPKE HOLGER DR ,  KASTENHUBER WALTER

    IPC: B01J19/18 ,  C08F2/00 ,  C08F2/22 ,  C08F12/08 ,  C08F14/06 ,  C08F14/08 ,  C08F18/08 ,  C08F20/00 ,  C08F36/06

    Abstract: In the process and a correspondingly appropriate device for preparing homo- or copolymers of at least one of the polymerizable monomers of the group consisting of styrene, butadiene, vinyl chloride, vinyl acetate, vinylidene chloride, alkyl (meth)acrylate (meth)acrylic acid, (meth)acrylonitrile and (meth)acrylamide reaction is carried out at at least 40.degree.C in the presence of a dispensing auxillary and of a free-radical polymerization initiator such that at least 85 % by weight of the polymer is formed from these monomers. In the multistage process the procedure is such that a) in a first stage water is added as a solvent which is inert in the reaction, and dispensing auxiliaries, seed and a first portion of monomer(s) are added if desired, b) in a second stage initiator is added, and c) in a third stage the remainder or all of the monomer(s) is added directly or in emulsion form and in the presence of further water and, if desired, further dispersing auxiliary or other auxiliaries. it also being possible to operate any two of the stages as a single stage. The reaction mixture, which is in emulsion from, is moved in all or some stages through an external circuit which leads from and back to the reaction vessel (2) and comprises at least one low-shear pump (7) and at lest on heat exchanger (8) having an essentially laminar flow profile. The products prepared by this process, which involves short preparation times, have good performance properties (for adhesive bonds, for example).

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