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    Prepn of violet titanium trichloride - by plasma chemical conversion of titanium tetrachloride
    33.
    发明专利
    Prepn of violet titanium trichloride - by plasma chemical conversion of titanium tetrachloride 未知

    公开(公告)号：DE2158956A1

    公开(公告)日：1973-05-30

    申请号：DE2158956

    申请日：1971-11-27

    Applicant: BASF AG

    Inventor： WISSEROTH KARL DR ,  SCHOLL RICHARD

    IPC: C01G23/02

    Abstract: The violet modification of TiC, suitable for use as a polymerisation catalyst, esp. for propylene, is made by plasmachemical conversion of TiC., using low voltage/high current arc across metal electrodes, esp. of Mg, Al, Cd, Ti or Fe. around bottom flask is coated internally with TiCl4 and the arc struck. The electrodes are adjustable, esp. the cathode, to compensate for metal loss during separation. After about 1 hr. the arc is stopped and the flask contents are heated to distil off unconverted TiCl4. The process has a relatively low energy comsumption.

    Low m wt polypropylene powder prodn - by gas phase ziegler polymerisation
    35.
    发明专利
    Low m wt polypropylene powder prodn - by gas phase ziegler polymerisation 未知

    公开(公告)号：DE2058122A1

    公开(公告)日：1972-05-31

    申请号：DE2058122

    申请日：1970-11-26

    Applicant: BASF AG

    Inventor： HERBECK RUDOLF DR ,  SCHOLL RICHARD ,  STAIGER GERHARD DR ,  STEDEFEDER JOACHIM DR ,  WISSEROTH KARL DR

    IPC: C08F10/06 ,  C08F110/06 ,  C08F3/10

    Abstract: Propylene opt. together with other monomers is polymerised in the gas phase in presence of Ziegler catalysts by introducing liquid propylene into the reaction zone, vaporising and polymerising, at catalyst activity is not 3000 pts. polymer/pt. catalyst-hr, using catalyst with molar ratio of Ti to al cpd. in 1:0.5-6 range, as in DT1720292, the process being modified by carrying out continuous polymerisation in presence of H2 as mol. wt. regulator and using mixt. of AlEt3 and AlEt2Cl in 4-1:1 molar ratio as reducing component of the Ziegler catalyst. This process can be used to produce polymer with intrinsic viscosity 3, i.e. 1.8-3.0 dl/g. in free-running, powder form, which can be processed conveniently in the fused state.

    Low molecular weight polyethylene
    37.
    发明专利
    Low molecular weight polyethylene 未知

    公开(公告)号：DE1808790A1

    公开(公告)日：1970-06-11

    申请号：DE1808790

    申请日：1968-11-14

    Applicant: BASF AG

    Inventor： WISSEROTH DR KARL ,  SCHOLL RICHARD

    IPC: C08F8/50

    Abstract: LOW MOLECULAR WEIGHT POLYETHYLENE. M1-. Controlled reduction of the mol.wt. of high mol.wt. polyethylene (limiting viscosity number (LVN) = 3.5 to 5 dl/g) by oxidation at 110-135 degrees C of finely powdered material (10 mu to 2 mm dia) dampened with 0.1-20 (pref. 1-10) wt.% of a solvent. Esp. useful for reducing polyethylenes of density >0.94 g/mm3 to a LUV of 1.5 to 3.5 to facilitate processing. Similar to known processes for degrading polypropylene or polyisobtylene, the equipment required is less massive and expensive than mechanical degradation by extrusion or milling, and less solvent wastage/recovery is involved than with solution oxidation techniques. The degree of degradation is easily controlled by varying temperature or residence time in the dampened (and partially compacted) powder zone.

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