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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
    85.
    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.

    86.
    发明专利
    未知

    公开(公告)号：AT202125T

    公开(公告)日：2001-06-15

    申请号：AT97910284

    申请日：1997-09-12

    Applicant: BASF AG

    Inventor： GUENTHERBERG NORBERT ,  HOFMANN JUERGEN ,  MAILAHN ELMAR ,  OHLIG HILMAR ,  CZAUDERNA BERNHARD ,  GRABOWSKI SVEN ,  BUS KLAUS

    IPC: B29B7/48 ,  B29B7/58 ,  B29B13/06 ,  B29C48/40 ,  B29C48/67 ,  B29C48/76 ,  B29C63/00 ,  C08J3/20 ,  C08J3/205 ,  C08J5/18 ,  C08L21/00 ,  C08L51/04 ,  B29C47/40 ,  B29C47/64 ,  B29C47/76

    Abstract: PCT No. PCT/EP97/05000 Sec. 371 Date Mar. 25, 1999 Sec. 102(e) Date Mar. 25, 1999 PCT Filed Sep. 12, 1997 PCT Pub. No. WO98/13412 PCT Pub. Date Apr. 2, 1998A process for preparing thermoplastics or polymer blends comprising (A) from 5 to 95% of a water-moist elastomer component containing up to 60% of residual water, (B) from 5 to 95% of a thermoplastic polymer, (C) from 0 to 95% of a further polymer, and (D) from 0 to 70% of additives, said process comprising mixing the components A to D in an extruder with mechanical dewatering of component A, wherein the extruder has at least two rotating screws and, in the conveying direction, is essentially composed of a metering section into which component A is fed, a squeeze section which serves for dewatering component A and contains a retarding element and an associated dewatering orifice which is present upstream of the retarding element by a distance corresponding to at least one screw diameter, a feed section in which the thermoplastic polymer B is introduced as a melt into the extruder, a plastication section with mixing or kneading elements, a devolatilization section with an orifice and in which the remaining water is removed as steam, and a discharge zone.

    88.
    发明专利
    未知

    公开(公告)号：DE59600972D1

    公开(公告)日：1999-01-21

    申请号：DE59600972

    申请日：1996-03-28

    Applicant: BASF AG

    Inventor： GOETZ WALTER ,  HOFMANN JUERGEN ,  KOPIETZ MICHAEL ,  HORLE HELMUT

    IPC: C08G69/26 ,  C08G69/04 ,  C08G69/28 ,  C08G73/10 ,  G03F7/004 ,  G03F7/038 ,  G11B5/48 ,  G11B21/00 ,  H05K1/05

    Abstract: A polymer based on a dicarboxylic acid and a diamine is prepared by polycondensation in an extruder, by(a) heating a mixture of a dicarboxylic acid having from 4 to 12 carbon atoms and a diamine having from 4 to 12 carbon atoms, which mixture is solid at room temperature and has a residual moisture content of less than 5% by weight, to a temperature in the range from 150 to 400° C. under autogenous pressure in a contrarotating twin-screw extruder to give a product A,(b) feeding the product A to a corotating twin-screw extruder, with the product A being exposed to a temperature in the range from 150 to 400° C. and residual water present and also water from the polycondensation being removed through the degassing openings, to give a product B, with the proviso that the corotating twin-screw extruder has at least two segments having different pressures.

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