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    发明专利
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    公开(公告)号：DE1908964A1

    公开(公告)日：1970-09-10

    申请号：DE1908964

    申请日：1969-02-22

    Applicant: BASF AG

    Inventor： STEIGERWALD DR KLAUS ,  BUECHNER DIPL-CHEM DR OSKAR ,  URBAN DR FRIEDRICH ,  PFANNMUELLER DR HELMUT

    IPC: C08F10/00 ,  C08F3/04

    Abstract: 1289618 Polymerizing ethylene BADISCHE ANILIN & SODA-FABRIK AG 20 Feb 1970 [22 Feb 1969] 8187/70 Heading C3P A continuous process for polymerizing ethylene at 250‹ to 340‹ C. and 1500 to 4000 atmospheres in a tubular reactor having two successive zones of about equal length comprises (1) introducing at the beginning of the first zone at 185‹ to 220‹ C. and 1500 to 4000 atmospheres a mixture of ethylene, 1 to 5 mole parts per million of an organic hydroperoxide having a half value temperature within the range 200‹ to 260‹ C. and 0À3 to 0À7 parts by weight per 100 parts of ethylene of a polymerization modifier having a C s value of 1À0 x 10 -2 to 4À0 x 10 -1 , and keeping the reaction temperature in the first zone at 305‹ to 340‹ C., and (2) introducing at the beginning of the second zone at 140‹ to 210‹ C. and 1500 to 4000 atmospheres a mixture of ethylene, 5 to 100 mole parts per million of oxygen and from 40 to 60 weight per cent of the amount used in the first zone per 100 parts of ethylene of a modifier having a C s value in the same range, and keeping the reaction temperature in the second zone at 250‹ to 305‹ C., provided that the weight ratio of the mixtures introduced into the first and second zones per unit time is in the range 1 : 2 to 2 : 1. Specified hydroperoxides are p-menthane, cumene and diisopropylbenzene hydroperoxides and 2-hydroperoxy-isopropylphenyl propanes. Specified modifiers are acetone, n-butyraldehyde, cyclohexanone, propionaldehyde and methyl ethylketone. The products have narrow molecular weight distributions and may be used for making films.

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