55.
    发明专利
    未知

    公开(公告)号:DE3775157D1

    公开(公告)日:1992-01-23

    申请号:DE3775157

    申请日:1987-10-09

    Applicant: BASF AG

    Abstract: Ethylene is polymerised, or copolymerised with minor amts. of 2-12C alpha-monoolefins, at 30-150 deg. C and 2-150 bar, using (a) a CrO3 catalyst and (b) a Li-alkyl cocatalyst of formula LiR, in atomic ratio of Cr : Li of 1 : 0.05-100. (a) The CrO3 catalyst is prepd. by (1) loading a finely divided, porous SiO2 carrier with CrO3, or a cpd. forming CrO3 in stage (2), in ratio by wt. of carrier : Cr of 100 : 0.1-10, and (2) heating the prod. from (1) at 400-1100 deg. C for 10-1000 mins., in a dry gas stream contg. more than 10 vols.% of O2. R = 2-6C alkyl.

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