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    Production of polymer dispersions, used as e.g. surface coatings and paints, comprises mixing a polymer, a surfactant and water in a twin-screw extruder
    3.
    发明专利
    Production of polymer dispersions, used as e.g. surface coatings and paints, comprises mixing a polymer, a surfactant and water in a twin-screw extruder 未知

    公开(公告)号：DE10109992A1

    公开(公告)日：2002-09-05

    申请号：DE10109992

    申请日：2001-03-01

    Applicant: BASF AG

    Inventor： GUENTHERBERG NORBERT ,  KURPS ARMIN ,  HOFMANN JUERGEN ,  MC KEE GRAHAM EDMUND

    IPC: B29C47/00 ,  C08J3/03 ,  C09D5/02 ,  C08J3/05 ,  C08J5/02 ,  C09J11/06

    Abstract: Production of polymer dispersions comprises mixing polymer, surfactant and water in twin-screw extruder comprising feed zone, melting zone, two mixing zones and discharge zone. A ring of molten polymer is formed between melting zone and first mixing zone, and seals in the contents of the feed zone. The discharge zone has a pressure-retaining device. The final solids content of dispersion is adjusted by adding water to last mixing zone Production of polymer dispersions with a solids content of 5-95 wt.% comprises mixing at least one polymer, at least one surfactant and water in a twin-screw extruder operating at a screw speed of at least 600 rpm, where: (a) the extruder comprises a feed zone into which the polymer is introduced; a melting zone in which the polymer is melted; a first mixing zone into which part of the water is fed to form a polymer-water mixture; a last mixing zone into which the rest of the water is fed and mixed with the polymer-water mixture; and a discharge zone; (b) the surfactant is introduced into the feed zone, the melting zone, the first mixing zone and/or the last mixing zone; (c) the design of the screws is such that a ring of molten polymer is formed between the melting zone and the first mixing zone and seals in the contents of the feed zone; (d) the discharge zone has a pressure-retaining device; and (e) the final solids content of the dispersion is adjusted by adding the appropriate amount of water to the last mixing zone.

    7.
    发明专利
    未知

    公开(公告)号：DE19946519A1

    公开(公告)日：2001-08-16

    申请号：DE19946519

    申请日：1999-09-28

    Applicant: BASF AG

    Inventor： GUENTHERBERG NORBERT ,  CZAUDERNA BERNHARD ,  HOFMANN JUERGEN ,  ITTEMANN PETER ,  KURPS ARMIN

    IPC: B01F7/00 ,  C08K5/00 ,  C09K15/08 ,  C09K15/14 ,  C09K15/20 ,  C08J3/20 ,  C08K5/13 ,  C08K5/36 ,  C08K5/524 ,  B01F5/16

    Abstract: The invention relates to a method for producing stabilizer dispersions for stabilizing plastic dispersions, containing the following: f) a dispersing agent, liquor A; g) at least one compound B, which acts as a tensile; h) optionally, at least one phenolic antioxidant C; i) optionally, at least one co-stabilizer D, containing sulfur or phosphorus; and j) optionally, other auxiliary materials and/or additives. At least one of the components C or D is present in the stabilizer dispersion and the components B, C and D are in powder or liquid form. The components A to D are continuously mixed using a mixer and are homogenized in a dispersing mechanism. The finished stabilizer dispersion is continuously removed from the dispersing mechanism. The invention also relates to the use of a device consisting of a housing in which one or more rotors rotate at high speed in corresponding stators on a motor-driven shaft, for the continuous production of stabilizer dispersions.

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