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    4.
    发明专利
    未知

    公开(公告)号：DE1720273A1

    公开(公告)日：1971-06-09

    申请号：DEB0092386

    申请日：1967-05-06

    Applicant: BASF AG

    Inventor： BUECHNER OSKAR DR ,  IMMEL WOLFGANG DR ,  PFANNMUELLER HELMUT DR ,  SCHMIDT-THOMEE GEORG DR ,  URBAN FRIEDRICH DR

    IPC: C08F10/00 ,  C08F3/04

    Abstract: 1,215,837. Low molecular weight polyethylene. BADISCHE ANILIN. & SODAFABRIK A.G. 2 May, 1968 [6 May, 1967], No. 20861/68. Heading C3P. Low molecular weight waxy polyethylene (a molecular weight up to 10,000) is prepared by-polymerizing ethylene at 200-300‹ C. and under a pressure of 1200-2500 atmospheres using a free-radical initiation, wherein the ethylene contains (a) 10-30% by volume of hydrogen or a C 2 -C 4 alkane and (b) 0À5-3% by volume of a C 3 -C 4 alkene. The alkane component (a) may be one or more of ethane, propane, butane and isobutane and (b) may be one or more of propene, butene-1, butene-2 and isobutylene. The initiator, which may be oxygen or dilauroyl peroxide, is perferably used in amounts of 0À5-2 moles per mole of ethylene. In the examples, ethylene containing hydrogen or propane, and propene or isobutylene, is continuously polymerized, the initiator being oxygen or dilauroyl peroxide.

    PROCESS FOR THE PREPARATION OF ETHYLENE COPOLYMERS
    8.
    发明专利
    PROCESS FOR THE PREPARATION OF ETHYLENE COPOLYMERS 未知

    公开(公告)号：DE2962013D1

    公开(公告)日：1982-03-11

    申请号：DE2962013

    申请日：1979-01-18

    Applicant: BASF AG

    Inventor： ZACHER WIELAND DR ,  PFLEGER KLAUS DR ,  BOETTCHER KLAUS DR ,  SKORCZYK RONALD ,  BUECHNER OSKAR DR

    IPC: C08F10/00 ,  C08F2/00 ,  C08F2/34 ,  C08F210/02

    Abstract: A continuous process for the manufacture of ethylene copolymers under high pressure and at high temperature in a polymerization zone, with transfer of the reaction mixture into a high pressure product isolation zone and from there into a low pressure product isolation zone, and recycling of the unconverted gas from the high pressure product isolation zone into the polymerization zone and from the low pressure product isolation zone into a low temperature separator, from where the comonomer separated off is recycled to the polymerization process, while the ethylene is discharged as off-gas. The gas taken off the low pressure product isolation zone is preferably compressed to from 10 to 20 bar and cooled to from -10 DEG to -30 DEG C. before it is fed into the low temperature separator. There is a substantial improvement in the efficiency of separating off the comonomer.

    10.
    发明专利
    未知

    公开(公告)号：DE3787310D1

    公开(公告)日：1993-10-14

    申请号：DE3787310

    申请日：1987-05-07

    Applicant: BASF AG

    Inventor： PFLEGER KLAUS DR ,  BOETTCHER KLAUS DR ,  BUECHNER OSKAR DR ,  KANNE FRIEDRICH DR ,  KURSAWE SIEGFRIED

    IPC: C08F2/00 ,  C08F2/38 ,  C08F210/00 ,  C08F210/02

    Abstract: Copolymers of ethylene with vinyl esters are prepared in a continuously operated tubular polymerization system at high pressure and temperatures by feeding a mixture of ethylene, vinyl ester, initiator and, if appropriate, regulant into the polymerization system in the form of a mainstream at the inlet point thereof and at the same time through two or more secondary streams downstream of the inlet point, secondary streams (I) being metered in at points where the reaction temperature has just exceeded a maximum temperature due to the heat of polymerization and secondary streams (II) at points which, relative to the direction of flow of the ethylene, are upstream of the feed points of secondary streams (I) and upstream of the respective maximum temperature.

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