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    POLYPROPYLENE MOULDING COMPOSITION AND PROCESS FOR ITS PREPARATION
    23.
    发明专利
    POLYPROPYLENE MOULDING COMPOSITION AND PROCESS FOR ITS PREPARATION 未知

    公开(公告)号：ZA752172B

    公开(公告)日：1976-04-28

    申请号：ZA752172

    申请日：1975-04-07

    Applicant: HOECHST AG

    Inventor： STRAMETZ H ,  LEUGERING H ,  RUST K ,  ENGELMANN M

    IPC: C08F2/00 ,  C08L23/00 ,  C08F2/14 ,  C08F297/00 ,  C08F297/08 ,  C08L7/00 ,  C08L21/00 ,  C08L23/06 ,  C08L23/08 ,  C08L23/10 ,  C08L23/12 ,  C08L23/16 ,  C08L101/00 ,  C08F

    Abstract: 1508033 Polyolefin compositions HOECHST AG 7 April 1975 [8 April 1974] 14080/75 Headings C3P and C3M Moulding compositions comprising (1) 70 to 90 weight per cent of crystalline polypropylene, (2) 2 to 10 weight per cent of an ethylene/propylene copolymer and (3) 8 to 25 weight per cent of polyethylene wherein the melt flow index of the composition is less than that of the polypropylene component and greater by a factor of 1À3 to 7À0 than that of polypropylene prepared by means of the same catalyst as the moulding composition and having the same reduced specific viscosity, may be prepared by (a) preparing polypropylene of melt flow index 5 to 80 g./10 mins. by polymerizing propylene at 0À5 to 40 kg/cm. and 40 to 110‹ C. in the presence of a stereo specific catalyst and 0- 1 to 20% by volume, based on the propylene, of hydrogen, (b) introducing ethylene at a propylene partial pressure of less than 0À5 kg./ cm. and 40‹ to 110‹ C. and (c) preparing polyethylene in a third step at a propylene partial pressure of less than 0À001 kg./cm. and a total pressure of 0À5 to 40 kg./cm. and at 40‹ to 110‹ C. in the presence of 1 to 50% by volume of hydrogen. In examples the polymers are prepared by sequential polymerization in the presence of catalysts comprising titanium trichloride and diethyl aluminium chloride.

    PROCESS FOR THE MANUFACTURE OF A CATALYST
    24.
    发明专利
    PROCESS FOR THE MANUFACTURE OF A CATALYST 未知

    公开(公告)号：ZA751244B

    公开(公告)日：1976-02-25

    申请号：ZA751244

    申请日：1975-02-28

    Applicant: HOECHST AG

    Inventor： SCHROTT E ,  STRAMETZ H ,  RUST K ,  KABLITZ H

    IPC: C08F4/00 ,  C08F4/60 ,  C08F4/64 ,  C08F10/00

    Abstract: A catalyst of high activity and stereospecificity in alpha -olefin polymerization is obtained when titanium trichloride, prepared from titanium tetrachloride by reduction with an aluminum alkyl halide, is thermally treated, first with an ether in the presence of a cyclopolyene and the solid reaction product is then treated with an aluminum alkyl halide in the presence of a small amount of a cyclopolyene and/or an olefin. With the catalyst obtained high space-time yields of alpha -olefin polymers and copolymers can be produced.

    30.
    发明专利
    未知

    公开(公告)号：BR7501220A

    公开(公告)日：1976-08-17

    申请号：BR7501578

    申请日：1975-02-28

    Applicant: HOECHST AG

    Inventor： RUST K ,  SCHROTT E ,  STRAMETZ H ,  KABLITZ H

    IPC: C08F4/00 ,  C08F4/60 ,  C08F4/64 ,  C08F10/00

    Abstract: A catalyst of high activity and stereospecificity in alpha -olefin polymerization is obtained when titanium trichloride, prepared from titanium tetrachloride by reduction with an aluminum alkyl halide, is thermally treated, first with an ether in the presence of a cyclopolyene and the solid reaction product is then treated with an aluminum alkyl halide in the presence of a small amount of a cyclopolyene and/or an olefin. With the catalyst obtained high space-time yields of alpha -olefin polymers and copolymers can be produced.

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