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    1.
    发明专利
    未知

    公开(公告)号：PT97833B

    公开(公告)日：1998-10-30

    申请号：PT9783391

    申请日：1991-05-31

    Applicant: HOECHST AG

    Inventor： BOHM LUDWIG

    IPC: C08F4/654 ,  C08F4/60 ,  C08F4/626 ,  C08F4/646 ,  C08F4/68 ,  C08F4/69 ,  C08F10/00

    Abstract: Poly-1-olefins, in particular polyethylene, are produced using a Ziegler catalyst whose transition metal constituents are produced by reacting a transition metal compound of titanium, zirconium, vanadium or chromium with a gel-like dispersion of a magnesium, alcoholate. An organoaluminium compound is used as co-catalyst. The polymerizates are obtained in high to very high yields and the particle size distribution of the polymerizates can be controlled.

    PROCESS FOR PRODUCING A POLY-1-OLEFIN
    3.
    发明专利
    PROCESS FOR PRODUCING A POLY-1-OLEFIN 未知

    公开(公告)号：AU7895091A

    公开(公告)日：1991-12-31

    申请号：AU7895091

    申请日：1991-05-24

    Applicant: HOECHST AG

    Inventor： BOHM LUDWIG

    IPC: C08F4/654 ,  C08F4/60 ,  C08F4/626 ,  C08F4/646 ,  C08F4/68 ,  C08F4/69 ,  C08F10/00

    Abstract: Poly-1-olefins, in particular polyethylene, are produced using a Ziegler catalyst whose transition metal constituents are produced by reacting a transition metal compound of titanium, zirconium, vanadium or chromium with a gel-like dispersion of a magnesium, alcoholate. An organoaluminium compound is used as co-catalyst. The polymerizates are obtained in high to very high yields and the particle size distribution of the polymerizates can be controlled.

    PROCESS FOR PRODUCING LOW MOLECULAR-WEIGHT POLY-1-OLEFINS
    6.
    发明专利
    PROCESS FOR PRODUCING LOW MOLECULAR-WEIGHT POLY-1-OLEFINS 未知

    公开(公告)号：CA2112954C

    公开(公告)日：2005-03-29

    申请号：CA2112954

    申请日：1994-01-06

    Applicant: HOECHST AG

    Inventor： BOHM LUDWIG ,  HERRMANN HANS-FRIEDRICH ,  BERTHOLD JOACHIM ,  HOHNER GERD ,  LECHT RAINER ,  VETTER HANS J

    IPC: C08F4/654 ,  C08F4/60 ,  C08F4/626 ,  C08F4/634 ,  C08F4/635 ,  C08F10/00 ,  C08F110/00

    Abstract: A catalyst formed by the reaction of a magnesium alkoxide dispersion having a particle size of from 100 to 3000 nm with a compound of a metal selected from the group comprising titanium, zirconium, vanadium and chromium and then with a chlorine-containing organoaluminum compound possesses a very good hydrogen responsiveness and a high activity even in the presence of molecular-weight regulators such as hydrogen. The catalyst is therefore outstandingly suitable for the production of low molecular-weight polyolefins. The catalyst makes possible the production of waxes having a reduced residual ash content. The large particle diameter and the low fines content of the polymer powder produced by suspension polymerization with this catalyst enables easy removal of the suspension medium and drying. The catalyst is furthermore advantageously used in solution polymerization and, because of the large particle diameter, in gas phase polymerization for producing low molecular-weight poly-1-olefins.

    Process for the preparation of a poly-1-olefin
    8.
    发明专利
    Process for the preparation of a poly-1-olefin 未知

    公开(公告)号：AU676941B2

    公开(公告)日：1997-03-27

    申请号：AU7599494

    申请日：1994-10-21

    Applicant: HOECHST AG

    Inventor： BREUERS WERNER ,  BOHM LUDWIG ,  LECHT RAINER

    IPC: C08F2/34 ,  C08F4/60 ,  C08F4/643 ,  C08F4/646 ,  C08F4/654 ,  C08F10/00 ,  C08F4/64 ,  C08F110/02 ,  C08F110/06

    Abstract: Use of shock waves instead of a stirrer for mixing the reactants gives a particularly uniform, spherical Ziegler catalyst. This highly active catalyst based on a dialkyl magnesium compound can be used in the polymerisation of alpha-olefins to give spherical polymers. A further advantage of the novel catalyst is the high catalyst activity, so that only very small amounts of the catalyst are necessary for the polymerisation. The residual titanium and/or zirconium content in the polymers prepared in accordance with the invention is less than 10 ppm. Its good hydrogen activity means that the catalyst is particularly suitable in two-step processes for the preparation of polymers having a broad, bimodal molecular weight distribution. Replacement of sulphur-containing electron donors, such as diethyl sulphite, by alcohols, such as ethanol, results in less odour nuisance and an expanded range of applications of the polymer. This spherical shape of the particles and the consequent very good flow properties of the polymers and copolymers mean considerable simplifications and advantages during handling, drying and processing.

    Process for producing low molecular-weight poly-1-olefins
    9.
    发明专利
    Process for producing low molecular-weight poly-1-olefins 未知

    公开(公告)号：AU669239B2

    公开(公告)日：1996-05-30

    申请号：AU5302694

    申请日：1994-01-05

    Applicant: HOECHST AG

    Inventor： BOHM LUDWIG ,  HERRMANN HANS-FRIEDRICH ,  BERTHOLD JOACHIM ,  HOHNER GERD ,  LECHT RAINER ,  VETTER HANS JOACHIM

    IPC: C08F4/654 ,  C08F4/60 ,  C08F4/626 ,  C08F4/634 ,  C08F4/635 ,  C08F10/00 ,  C08F110/00 ,  C08F4/646 ,  C08F4/68 ,  C08F4/69

    Abstract: A catalyst formed by reacting a magnesium alkoxide dispersion whose particle size is from 100 to 3000 nm with a compound of a metal from the group consisting of titanium, zirconium, vanadium and chromium and then with a chlorine-containing organoaluminium compound has very good hydrogen sensitivity and high activity even in the presence of molecular weight regulators such as hydrogen. This makes the catalyst highly suitable for the preparation of low-molecular-weight polyolefins. The catalyst enables the preparation of waxes having a reduced residual ash content. The large particle diameter and the low fines content of the polymer powder prepared by suspension polymerisation using this catalyst enable ready separation and drying of the suspension medium. The catalyst is furthermore advantageous in solution polymerisation and, due to the large particle diameter, can be used in gas-phase polymerisation for the preparation of low-molecular-weight poly-1-olefins.

    10.
    发明专利
    未知

    公开(公告)号：ES2076529T3

    公开(公告)日：1995-11-01

    申请号：ES91909998

    申请日：1991-05-24

    Applicant: HOECHST AG

    Inventor： BOHM LUDWIG

    IPC: C08F4/654 ,  C08F4/60 ,  C08F4/626 ,  C08F4/646 ,  C08F4/68 ,  C08F4/69 ,  C08F10/00

    Abstract: Poly-1-olefins, in particular polyethylene, are produced using a Ziegler catalyst whose transition metal constituents are produced by reacting a transition metal compound of titanium, zirconium, vanadium or chromium with a gel-like dispersion of a magnesium, alcoholate. An organoaluminium compound is used as co-catalyst. The polymerizates are obtained in high to very high yields and the particle size distribution of the polymerizates can be controlled.

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