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    4.
    发明专利
    未知

    公开(公告)号：FI924388A0

    公开(公告)日：1992-09-30

    申请号：FI924388

    申请日：1992-09-30

    Applicant: BASF AG

    Inventor： FUNK GUIDO ,  HEMMERICH RAINER ,  KOLK ERICH ,  FOLLMER GODOFREDO

    IPC: C08F4/02 ,  C08F4/06 ,  C08F4/22 ,  C08F4/24 ,  C08F4/69 ,  C08F10/00 ,  C08F10/02 ,  C08F

    Abstract: In a new process for the preparation of a supported catalyst for the polymerisation of alpha -olefins, first a support gel (1) is prepared by introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid optionally containing aluminium ions longitudinally and tangentially to the stream, spraying the resultant silicic acid hydrosol in drop form into a gaseous medium, and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel, without prior ageing, from salts by washing and optionally from some of the water by extraction with alcohols and/or ketones, and then drying the hydrogel. This gives the support gel (1), which is ground and fractionated according to particle size. In a second process step, the support gel (1) is charged with chromium trioxide or with a chromium compound which can be converted into chromium trioxide, after which the resultant chromium-containing support gel (2) is heated at from 400 to 1100 DEG C for from 10 to 1000 minutes in an anhydrous gas stream containing oxygen in a concentration greater than 10% by volume. It is essential for the process according to the invention that the drying of the hydrogel to form the support gel (1) takes place in a high-speed drier within a maximum time of 300 seconds at an inlet temperature of from 200 to 600 DEG C. The supported catalyst prepared in this way gives homopolymers and copolymers of ethylene having excellent low-temperature toughness.

    6.
    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

    Inventor： KONRAD RAINER ,  HEMMERICH RAINER ,  MUELLER-MALL RUDOLF ,  SCHWEIER GUENTHER

    IPC: C08F4/02 ,  C08F4/24 ,  C08F4/48 ,  C08F4/62 ,  C08F10/02

    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.

    7.
    发明专利
    未知

    公开(公告)号：FI103728B1

    公开(公告)日：1999-08-31

    申请号：FI924388

    申请日：1992-09-30

    Applicant: BASF AG

    Inventor： FUNK GUIDO ,  HEMMERICH RAINER ,  GROPPER HANS ,  KOLK ERICH ,  FOLLMER GODOFREDO

    IPC: C08F4/02 ,  C08F4/06 ,  C08F4/22 ,  C08F4/24 ,  C08F4/69 ,  C08F10/00 ,  C08F10/02

    Abstract: In a new process for the preparation of a supported catalyst for the polymerisation of alpha -olefins, first a support gel (1) is prepared by introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid optionally containing aluminium ions longitudinally and tangentially to the stream, spraying the resultant silicic acid hydrosol in drop form into a gaseous medium, and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel, without prior ageing, from salts by washing and optionally from some of the water by extraction with alcohols and/or ketones, and then drying the hydrogel. This gives the support gel (1), which is ground and fractionated according to particle size. In a second process step, the support gel (1) is charged with chromium trioxide or with a chromium compound which can be converted into chromium trioxide, after which the resultant chromium-containing support gel (2) is heated at from 400 to 1100 DEG C for from 10 to 1000 minutes in an anhydrous gas stream containing oxygen in a concentration greater than 10% by volume. It is essential for the process according to the invention that the drying of the hydrogel to form the support gel (1) takes place in a high-speed drier within a maximum time of 300 seconds at an inlet temperature of from 200 to 600 DEG C. The supported catalyst prepared in this way gives homopolymers and copolymers of ethylene having excellent low-temperature toughness.

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