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    17.
    发明专利
    未知

    公开(公告)号：DE58900872D1

    公开(公告)日：1992-04-02

    申请号：DE58900872

    申请日：1989-05-30

    Applicant: BASF AG

    Inventor： BUNG RICHARD ,  LAUN MARTIN ,  LOUIS GERD ,  SCHMIDT FRANZ

    IPC: B60K17/34 ,  B60K17/346 ,  B60K17/35 ,  C10M145/04 ,  C10M145/14 ,  C10N20/00 ,  C10N40/08 ,  F16D35/00

    Abstract: Fluid friction coupling for automatic engagement and disengagement of torque transmission, when the input or output side of the clutch exceeds or falls below a difference in speed, in particular for automatic engagement and disengagement of multiple-wheel drives of motor vehicles, with a working fluid consisting of a dilatant fluid, characterized in that the working fluid is an extremely dilatant copolymer dispersion whose characteristic dilation values, namely critical shear rate gamma k and maximum transmissible shearing strain tau max, are stabilized to permanent loading by emulsion polymerization with an additional 5 to 30 wt. %, preferably 8 to 18 wt. %, referred to the finished polymerizate, of (meth)alkyl compounds with at least 2 polymerizable double bonds in the molecule, e.g. dialkylephthalate and/or (meth)alkyl(meth)acrylates as comonomers.

    CONTINUOUS PREPARATION OF NYLONS
    18.
    发明专利
    CONTINUOUS PREPARATION OF NYLONS 未知

    公开(公告)号：CA1222590A

    公开(公告)日：1987-06-02

    申请号：CA456616

    申请日：1984-06-14

    Applicant: BASF AG

    Inventor： PIPPER GUNTER ,  SCHMIDT FRANZ ,  THEYSOHN RAINER ,  RIEGGER SIEGFRIED ,  HEIL EDUARD ,  FISCHER HERMANN ,  THOMA RICHARD ,  MATTHIES PAUL

    IPC: C08G69/00 ,  C08G69/26 ,  C08G69/28 ,  C08L77/00

    Abstract: - 10 - O.Z. 0050/36564 Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250-300.degree.C under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250 to 300.degree.C, wherein the aqueous salt solution is condensed under superatmospheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

    CONTINUOUS PREPARATION OF NYLONS
    19.
    发明专利
    CONTINUOUS PREPARATION OF NYLONS 未知

    公开(公告)号：CA1216993A

    公开(公告)日：1987-01-20

    申请号：CA456498

    申请日：1984-06-13

    Applicant: BASF AG

    Inventor： SCHMIDT FRANZ ,  PIPPER GUNTER ,  FLOSS JOSEF G ,  ZAHRADNIK FRANZ

    IPC: C08G69/26 ,  C08G69/00 ,  C08G69/28 ,  C08L77/00

    Abstract: Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250-300.degree.C under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250 to 300.degree.C, wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.

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