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    23.
    发明专利
    未知

    公开(公告)号：DE59005190D1

    公开(公告)日：1994-05-05

    申请号：DE59005190

    申请日：1990-11-12

    Applicant: BASF AG

    Inventor： GROPPER HANS ,  FUNK GUIDO ,  KOLK ERICH ,  OEDER DIETER

    IPC: C08F4/02 ,  C08F4/18 ,  C08F4/22 ,  C08F4/24 ,  C08F10/00 ,  C08F110/02

    Abstract: The novel catalyst for the preparation of high-molecular-weight homopolymers or copolymers of ethene is obtainable by (1) treating a silicon dioxide-based support with (2) chromium trioxide or a chromium compound which can be converted into chromium dioxide under the conditions of step (3), and then (3) heating the resultant intermediate in an oxygen-containing stream of gas, where the support (1) is a specific silicic acid xerogel obtainable by extracting a maximum of 30% of water from a silicic acid hydrogel by means of alkanols, alkanones or mixtures thereof, and subsequently drying, comminuting and fractionating the product.

    25.
    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.

    28.
    发明专利
    未知

    公开(公告)号：ES2137440T3

    公开(公告)日：1999-12-16

    申请号：ES95118131

    申请日：1995-11-17

    Applicant: BASF AG

    Inventor： ROHDE WOLFGANG ,  FUNK GUIDO ,  GORTZ HANS-HELMUT ,  OSTERLOH ROLF

    IPC: C08F6/02 ,  C08F10/00

    Abstract: In the prepn. of stabilised polyolefins (I), which have a small fraction extractable with cold heptane, by polymerisation of olefins with Ziegler or Phillips catalysts, (I) is brought into contact with an involatile phenol deriv. (II) immediately after leaving the polymerisation reactor. Also claimed are (I) per se and fibres, films and mouldings contg. (KI). Pref. (II) has a mol.wt. of at least 250 and a b.pt. of over 270 degrees C at 100 kPa. (I) esp. is a 2,6-di-tert.-butylphenol deriv..

    29.
    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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