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    Olefin polymn. catalyst prodn. - by forming silicic acid-xerogel and charging with chromium trioxide
    22.
    发明专利
    Olefin polymn. catalyst prodn. - by forming silicic acid-xerogel and charging with chromium trioxide 未知

    公开(公告)号：DE2455557A1

    公开(公告)日：1976-05-26

    申请号：DE2455557

    申请日：1974-11-23

    Applicant: BASF AG

    Inventor： BACHL ROBERT DIPL CHEM DR ,  FRIELINGSDORF HANS DIPL ING DR ,  GRUBER WOLFGANG DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D ,  GONSIOR LEONHARD DIPL CHEM DR

    IPC: C08F10/00 ,  C08F4/24

    Abstract: Silicic acid-xerogel/Cr2O3 catalyst for polymsn. of olefins is obtd. by (1) first forming a finely divided (10-200 mu-m. dia.) silicic acid xerogel, (2) charging the xerogel with 0.1-10wt.% (w.r.t. the xerogel and calc. as Cr) of Cr2O3 or a Cr cpd. which forms Cr2O3 in step (3), and (3) holding the resulting prodt. in a water-free gas stream contg. >10vol.% 02, for 10-1000 mins. at 400-1100 degrees C, the silicic acid-xerogel being produced by (1.ue starting from a 0.1-20wt.% solids (calc. as SiO2) contg. aq. soln. of water glass, (1.2) exchanging the Na+ ion in the soln. for H+ with an ion exchanger until the Na content (calc. as Na2O) in the silicic acid xerogel amts. to is not >0.2wt.%, (1.3) adding to the soln. a water-sol Al salt (and opt. water) of such a kind that a wt. ratio water:silicic acid (calc. as SiO2) of 100:0.05-100:24 as well as a wt. ratio SiO2:Al2O3 of 100:100-100: 2 is obtd., (1.4) opt. bringing the resulting soln. to a pH of 0.1-3.5 with an aq.inorganic acid soln. of such a kind that the wt.ratio water:silicic acid and SiO2:Al2O3 remain as in (1.3), (1.5) bring the resulting soln. to a pH of 4-12 with a water-sol. neutralising nitrogen base, (1.6) extracting the resulting solid phase prodt. (silicic acid hydrogel) using a 1-4C alkanol and/or 3-5C alkanone until the organic liq. takes up no more water, and finally (1.7) drying the dehydrated gel, which is satd. with organic liq. until at 120 degrees C no further wt. loss occurs (xerogel-formation). The resulting catalyst can be used for polymsn. of olefins in the absence of M.W- regulators or in presence of a comparatively small amt. of M.W. regulator.

    Olefin polymn catalyst - made by heating silicic acid xerogel with solid chromium trioxide
    25.
    发明专利
    Olefin polymn catalyst - made by heating silicic acid xerogel with solid chromium trioxide 未知

    公开(公告)号：DE2411734A1

    公开(公告)日：1975-09-25

    申请号：DE2411734

    申请日：1974-03-12

    Applicant: BASF AG

    Inventor： FRIELINGSDORF HANS DIPL ING DR ,  GRUBER WOLFGANG DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D ,  GONSIOR LEONHARD DIPL CHEM DR

    IPC: C08F4/24 ,  C08F10/00

    Abstract: Olefin polymsn. catalysts are made by (1) forming a finely divided silica xerogel with a particle size of 10 to 2000 mu m by (a) making a 10-25 wt. % solids (as SiO2) silicic acid hydrogel, (b) extracting water from the hydrogel with a 1-4 C alkanol and/or a 3-5 C alkanone until the org. liq. takes up no more water and (c) drying the dewatered gel, satd. with the org. liq. until no further wt. loss occurs on heating at 180 degrees C/10 Torr for 30 mins.; (2) mixing the resulting xerogel with solid, finely divided CR2O3 and heating at 100-300 degrees C/0.01-250 Torr until the xerogel has taken up 0.1-10 wt. % Cr2O3 (calculated as Cr), and (3) treating the prod. for 10-1000 min. at 40-1100 degrees C in a moisture-free gas stream contg. >10 vol. % O2. The catalyst give high yields and have high activity, and the resulting polymers have relatively narrow particle size distribution, low fines content and a sufficiently high melt index when made in the absence of mol. wt. regulators.

    Reducing blocking of polyethylene films using ethylene polymer latex - without altering optical properties or processing of film
    28.
    发明专利
    Reducing blocking of polyethylene films using ethylene polymer latex - without altering optical properties or processing of film 未知

    公开(公告)号：DE2603510A1

    公开(公告)日：1977-08-04

    申请号：DE2603510

    申请日：1976-01-30

    Applicant: BASF AG

    Inventor： HARTIG ULRICH DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D

    IPC: C08J7/04 ,  C08L23/06 ,  C08J7/16

    Abstract: The tendency of polyethylene films to stick together is reduced by applying to the film a 0.01-10 (0.01-5) wt. % dispersion of an ethylene polymer with melt index 0.1-50 g/10 minutes and with particles 5 mu and drying the film by evapn. of the water. The film is esp. of a low-density polyethylene (0.91-0.93 g/cc). The latex contains a polyethylene of density 0.918-0.935 g/cc, or a copolymer contg. 50-99.9 (90-99.9) moles % ethylene and 50-0.1% of a comonomer, esp. 10-0.1% of an acrylate ester, in partic. n-butyl or 2-ethylhexyl acrylate. The latex may contain a dispersant, e.g. 0.1-5 wt. % of a Na alkylsulphonate, and has pH 3-12 (5-11). The particle size is pref. 1 (0.01-1) mu. The optical properties, e.g. gloss, of the film are not affected. The dispersion coating adheres well to the film and does not affect processing.

    Ziegler type catalyst for (alpha)-olefin (co)polymerisation - giving good control of polymerisation and polymers
    30.
    发明专利
    Ziegler type catalyst for (alpha)-olefin (co)polymerisation - giving good control of polymerisation and polymers 未知

    公开(公告)号：DE2543272A1

    公开(公告)日：1977-04-07

    申请号：DE2543272

    申请日：1975-09-27

    Applicant: BASF AG

    Inventor： SCHWEIER GUENTHER DIPL CHEM DR ,  BACHL ROBERT DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D ,  FRIELINGSDORF HANS DIPL ING DR ,  GRUBER WOLFGANG DIPL CHEM DR ,  KOLK ERICH DIPL CHEM DR

    IPC: C08F4/62 ,  C08F10/00 ,  C08F4/64

    Abstract: (Co)polymerisation of 2-10C alpha-mono-olefins at 30-200 degrees C/0.1-200 bars press., is effected in the presence of a Ziegler type catalyst system composed of (1) a fraction contg. Ti and/or V (component A) and (2) a metallic cpd. (component B) of formula (I): (Me-Am-nXn (I) (where Me is Al, Mg or Zn or their mixt.; A is 1-12, pref. 2-8C hydrocarbon radical; X is Cl, Br, I or H; m = valency of Me; n is a value between 0 and m-1, pref. 0 or 1). The respective proportions of A and B are such that the atomic ratio between the transition metal of A and the metal Me of B is 1:0.1-1:500, pref. 1:0.2-1:200. The novel component A is a solid prod. prepd. by (a) mixing finely particulate porous SiO2 (prod. I) of particle size 1-1000 u, pref. 1-400 u, a pre vol. of 0.3-3, pref. 1-2.5 cm3/g and an active surface area of 100-1000 pref. 200-400 m2/g with a Mg cpd. (prod. II) dissolved in an organic solvent, in such proportions that the wt. ratio between SiO2 and the Mg cpd. is 1:0.01-1:0.25, pref. 1:0.05-1:0.2, (b) mixing the solid prod. from (a) prod. (III) with a deriv. of Ti and/or V (prod. Iv), in the solid or liq. state or dissolved in an organic solvent, in such proportions that the wt. ratio between prod. III and the transition metal of prod. IV is 1:0.01-1:20, the resulting solid prod. V comprising A. Used for e.g. propene, butene, hexene-1, etc. with component (A), the initiation of the polymerisation is relatively slow and its max. activity is reached progressively, thus allowing control of the polymerisation reaction. The polymers obtd. e.g. polyethylene, have morphologically properties.

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