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    1.
    发明专利
    未知

    公开(公告)号：DE1807493A1

    公开(公告)日：1970-06-11

    申请号：DE1807493

    申请日：1968-11-07

    Applicant: BASF AG

    Inventor： STEIGERWALD DR KLAUS ,  BUECHNER DR OSKAR ,  BALL DR WOLFGANG ,  PFANNMUELLER DR HELMUT ,  URBAN DR FRIEDRICH

    IPC: C08F10/00 ,  C08F3/04

    Abstract: 1278649 Polymerizing ethylene BADISCHE ANILIN- & SODA-FABRIK AG 6 Nov 1969 [7 Nov 1968] 54426/69 Heading C3P Ethylene homopolymers are prepared by continuous polymerization of ethylene in the presence of organic peroxide initiator and a polymerization modifier at 280‹ to 340‹ C. and 1500 to 4000 atmospheres in a tubular reactor having two successive reaction zones of about equal length, a mixture of ethylene, peroxide and modifier being introduced at the beginning of each stage, wherein (1) a mixture of ethylene, 1 to 5 mole p.p.m. of an organic hydroperoxide having a half value temperature in the range 200‹ to 260‹ C. and 1À2 to 1À7 parts by weight per 100 ethylene of a modifier having a C s value of 2À0 Î 10 -2 to 1À0 Î 10 -4 is introduced at 170‹ to 220‹ C. to the beginning of the first zone in which the reaction temperature is kept in the range 310‹ to 340‹ C., and (2) a mixture of ethylene, 5 to 20 mole p.p.m. of an organic peroxy compound having a half value temperature in the range 150‹ to 195‹ C. and 1À2 to 1À7 parts by weight per 100 ethylene of a modifier having a C s value in the above range is introduced at 160‹ to 190‹ C. to the beginning of the second zone in which the reaction temperature is kept in the range 280‹ to 300‹ C., the half value temperatures of said hydroperoxide and peroxy compound differing by at least 20‹ C. and the weight ratio of the mixtures introduced per unit time being in the range 1 : 2 to 2 : 1. Specified hydroperoxides are p-menthane, cumene and diisopropylbenzene monohydroperoxide, and 2- hydroperoxy - 2 - (isopropylphenyl) propanes and mixtures thereof. Specified peroxides are di-t-butyl peroxide, t-butyl peracetate, t-butyl perbenzoate and methyl ethyl ketone peroxide. Specified modifiers are propylene, propane, methane and cyclohexane. The products have a broad molecular weight distribution free from very high molecular weight constituents, and are useful for making laminating films and for coating paper and fabrics.

    3.
    发明专利
    未知

    公开(公告)号：DE1904739A1

    公开(公告)日：1970-08-20

    申请号：DE1904739

    申请日：1969-01-31

    Applicant: BASF AG

    Inventor： RETTIG AUGUST ,  BALL DR WOLFGANG ,  UIZFSPERGER DR JOHANN ,  URBAN DR FRIEDRICH ,  PFANNMUELLER DR HELMUT

    IPC: B29B7/00 ,  B29B13/02 ,  B29C47/00 ,  B29C47/80 ,  B29C47/82 ,  B29C48/92 ,  C08L23/06 ,  C08F27/28

    Abstract: 1287036 Shearing polyethylene BADISCHE ANILIN- & SODA-FABRIK AG 30 Jan 1970 [31 Jan 1969] 4548/70 Heading C3P Molten high pressure polyethylene is subjected to shearing in a shearing unit at a temperature of 200‹ to 300‹ C. and a viscosity of 5 Î 10 3 to 1 Î 10 5 poises in the absence of atmospheric oxygen, wherein the shearing surfaces contacting the polyethylene melt are at a temperature at least equal to that of the polyethylene melt entering the shearing unit and shearing is effected with such speed that the product of shearing speed and residence time is 5 x 10 2 to 5 x 10 4 . The unit may be a screw extruder. The polymer may contain 0À01 to 0À5 weight per cent of residual ethylene which may react with radicals formed in the shearing zone. The products may be made into films.

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