公开(公告)号：CA2015650A1

公开(公告)日：1990-10-28

申请号：CA2015650

申请日：1990-04-27

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  SHIOMURA TETSUNOSUKE ,  UCHIKAWA NOBUTAKA ,  SASAKI TATEYO ,  UCHIDA OSAMU ,  IWATANI TUTOMU

IPC: C08F210/06

公开(公告)号：CA2030807A1

公开(公告)日：1990-10-12

申请号：CA2030807

申请日：1990-04-10

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  SHIOMURA TETSUNOSUKE ,  UCHIKAWA NOBUTAKA ,  SASAKI TATEYO ,  INOUE TAKEO

IPC: B29C67/24 ,  B29C71/02 ,  C08J5/00 ,  C08K3/00 ,  C08K5/00 ,  C08L23/10 ,  B29C35/00

公开(公告)号：IN166637B

公开(公告)日：1990-06-30

申请号：IN814CA1986

申请日：1986-11-10

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  FUJIO ICHIRO ,  UCHIKAWA NOBUTAKA

IPC: B01J19/00 ,  C08F2/00 ,  C08F2/02 ,  C08F2/38 ,  C08F10/06 ,  C08F110/06 ,  C08F10/02 ,  C08F10/04

Abstract: To control the molecular weight of a propylene homo- or co-polymer at a constant level when subjecting propylene alone, or together with another alpha -olefin, to bulk polymerization in the presence of hydrogen as a molecular weight modifier, the polymerization is performed in a reaction tank equipped with a reflux condenser, using liquid monomer as the reaction medium. The molecular weight is controlled at a desired level, by constantly measuring the quantity of heat removed from the reaction tank and constantly calculating the volume of hydrogen to be consumed, on the basis of the above-measured quantity of removed heat and the volume (X) of hydrogen consumed per unit amount of polypropylene, which volume (X) is obtained by utilizing the relation In eta =InX+A. (A being a constant and eta being the intrinsic viscosity of the propylene polymer). Hydrogen is charged into the reaction tank in quantities corresponding to variations in the calculated quantity.

公开(公告)号：FI902918A0

公开(公告)日：1990-06-11

申请号：FI902918

申请日：1990-06-11

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  SHIOMURA TETSUNOSUKE ,  UCHIKAWA NOBUTAKA ,  IWATANI TUTOMU ,  TAKEUCHI KATSUMI

IPC: C08F2/44 ,  C08F297/08 ,  C08L23/12 ,  C08L23/14 ,  C08L23/16 ,  C08F

Abstract: Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl groups in the spectrum of the methyl groups measured by C-NMR is 0.7 or more, and a copolymer of ethylene and propylene, and a preparation process thereof.

公开(公告)号：IN166130B

公开(公告)日：1990-03-17

申请号：IN934CA1986

申请日：1986-12-22

Applicant: MITSUI TOATSU CHEMICALS

Inventor： FUJIO ICHIRO ,  ITO KANEO ,  ASANUMA TADASHI

IPC: C08F293/00 ,  B01J19/18 ,  C08F2/00 ,  C08F2/01 ,  C08F297/08

Abstract: A block copolymer of propylene is obtained with its quality kept uniform by first conducting continuous polymerization of propylene in a polymerization system (A, B), discharging a polymer slurry continuously from the polymerization system (A, B) into a batchwise polymerization tank (C, or C 2 ), and by feeding ethylene to the tank for conducting batchwise polymerization therein of ethylene and propylene. Subsequently, a copolymer slurry formed by the preceding batchwise polymerization is discharged, leaving at least a predetermined amount of unreacted ethylene in the tank (C 1 or C 2 ). Into the tank with the unreacted ethylene still left therein, are simultaneously charged polymer slurry from the polymerization system (A, B) and a deactivator, without supplying ethylene, and the deactivator charging rate is controlled in such a way that the partial pressure of ethylene in the vapor phase of the tank always reaches a predetermined value at the time point of completion of reception of the polymer slurry therein. After batch polymerization, a polymer slurry is fed to a flash tank (E) which functions to provide the block copolymer in powder form for collection in a receiver (F).

公开(公告)号：GB2184736B

公开(公告)日：1990-01-31

申请号：GB8629668

申请日：1986-12-11

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  ITO MITSURU ,  ITO KANEO ,  FUNAKOSHI YOSHIYUKI ,  NAKAJIMA AKAHIKO

IPC: B01J19/00 ,  C08F2/00 ,  C08F2/02 ,  C08F110/06

Abstract: Disclosed herein is a method for controlling the polymerization temperature in a polymerization apparatus equipped with a cooling system in which steam, which has occurred in the presence of a volatile liquid medium in a reaction system, is condensed in a reflux condenser and the resulting noncondensable gas and condensate are then returned to the reaction system, thereby removing the polymerization heat. A portion of the noncondensable gas is recirculated to the cooling system. The flow rate of the noncondensable gas to be recirculated and the flow rate of a cooling medium to be introduced into the reflux condenser are controlled in accordance with the temperature of the reaction system.

公开(公告)号：MX159015A

公开(公告)日：1989-04-07

申请号：MX18749881

申请日：1981-05-27

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  UCHIKAWA NOBUTAKA ,  SHIOMURA TETSUNOSUKE

IPC: C08F4/02 ,  C08F4/50 ,  C08F4/60 ,  C08F4/00 ,  C08F4/64 ,  C08F4/642 ,  C08F10/00 ,  C08F10/02

Abstract: Stereospecific polymerization of alpha -olefins is carried out with use of a catalyst system comprising an activated titanium compound, an organoaluminum compound and an electron donative compound. The activated titanium compound is obtained by copulverizing magnesium halide, a halongenated hydrocarbon and an orthocarboxylic acid ester and then treating the copulverized product with titanium halide.

公开(公告)号：IN163530B

公开(公告)日：1988-10-08

申请号：IN144CA1986

申请日：1986-02-27

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  OHOKA TATUO ,  HINO MINORU ,  UCHIKAWA NOBUTAKA

IPC: C08F2/00 ,  B01D3/40 ,  C08F6/00 ,  C08F6/06 ,  C08F10/00 ,  C07C7/00

Abstract: A process for purifying a solvent suitable for use in the polymerization of an olefin in the presence of a Ziegler-Natta catalyst, which comprises feeding the polymerization solvent to a stage lower than a chimney tray of a multi-stage distillation column, said chimney tray being provided at a height between the top and bottom of the column, feeding an organoaluminum compound to a stage higher than the chimney tray, drawing out a condensate from the chimney tray, heating the condensate to produce heated vapor, introducing the heated vapor to the chimney tray or to a stage higher than the chimney tray but lower than the stage to which the organoaluminum compound has been fed, and drawing the solvent in a purified state from the top.

公开(公告)号：AU569829B2

公开(公告)日：1988-02-18

申请号：AU6505886

申请日：1986-11-12

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  FUNAKOSHI YOSHIYUKI ,  ITO KANEO ,  NAKAJIMA AKIHIKO

IPC: B04C11/00

公开(公告)号：GB2157701B

公开(公告)日：1987-11-18

申请号：GB8509603

申请日：1985-04-15

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANUMA TADASHI ,  OHOKA TATUO ,  UCHIKAWA NOBUTAKA

IPC: C08F6/24 ,  C08F6/00 ,  C08F6/26

Abstract: A process is provided herein wherein a solid polymer slurry diluted with a specific diluent is continuously discharged under controlled conditions from a high pressure zone to a low pressure zone substantially maintained at atmospheric pressure and the slurry is then separated into said diluent and dried polymer, the improvement wherein the discharged amount of the solid polymer slurry is strictly controlled by varying the heat in the second zone and simultaneously adding a diluent which is gaseous under normal temperature and pressure so that by the control of these two perimeters a continuous slurry discharge can be maintained at predetermined levels.