Abstract:
Manufacture of particulate polyethylene by polymerizing ethylene in an agitated bed of dry particulate polyethylene by means of a catalyst system comprising (1) a particulate inorganic carrier and (2) a Ziegler catalyst applied to said carrier. The catalyst system is used in the form of an intimate mixture of the catalyst system with a particulate ethylene polymer which does not soften at the polymerization temperature used, the particles in said mixture being coated with a saturated hydrocarbon wax which is solid at 30*C but liquid at the polymerization temperature used. This process makes it possible to obtain particulate polyethylene having a desirable particle size distribution.
Abstract:
1. A PROCESS FOR THE MANUFACTURE OF A PARTICULATE CATALYST COMPOSITION (K) HAVING A PARTICLE DIAMETER OF FROM 0.1 TO 5 MM AND SUITABLE FOR THE POLYMERIZATION OF OLEFINS, COMPRISING A ZIEGLER CATALYST SYSTEM (Z) EMBEDDED IN A WAX, THE ZIEGLER CATALYST SYSTEM CONSISTING OF: (1) A GRAMS OF A PARTICULATE INORGANIC CARRIER HAVING A PARTICLE DIAMETER OF FROM 0.001 TO 2 MM. AND CONTAINING CHEMICALLY COMBINED METALS, AND (2) FROM 0.001A TO 0.1A GRAMS IN TERMS OF THE TRANSITION METAL IN CATALYST COMPONENT (2.1), OF A ZIEGLER CATALYST APPLIED TO SAID CARRIER, WHICH ZIEGLER CATALYST CONSISTS: (2.1) B GRAM-MOLES OF A CATALYST COMPONENT CONSISTING OF A CHLORIDE, OXYCHLORIDE OR ALKOXYCHLORIDE OF TITANIUM, ZIRCONIUM OR VANADIUM, AND (2.2) FROM 0.01B TO 100B GRAM-MOLES OF A CATALYST COMPONENT CONSISTING OF A SATURATED METAL ALKYL, SATURATED METAL ALKOXYALKYL OR SATURATED METAL ALKYLHALIDE OF ALUMINUM, MAGNESIUM OR ZINC OR A LITHIUM ALKYL, WHEREIN AN INTIMATE MIXTURE (G) HAVING A TEMPERATURE OF FROM 40* TO 120*C. AND CONSISTING OF C GRAMS OF THE ZIEGLER CATALYST SYSTEM (Z) AND 1C TO 100C GRAMS OF A MELT WAX HAVING A MELTING POINT ABOVE 30*C IS CONVERTED TO THE PARTICULATE CATALYST COMPOSITION (K) BY COMMUNITION OF SAID MIXTURE (G), IN WHICH 1 PART BY WEIGHT OF SAID INTIMATE MIXTURE (G) HAVING A TEMPERATURE OF FROM 40*C. TO 120*C. IS PASSED AT A RATE OF FROM 0.0001 TO 0.01 PART BY WEIGHT PER SECOND, INTO FROM 0.2 TO 25 PARTS BY VOLUME, SAID PARTS BY WEIGHT RELATING TO SAID PARTS BY VOLUME, SAID PARTS BY WEIGHT RELATING LIQUEFIED INERT GAS HAVING A TEMPERATURE OF FROM -30* TO -200:C AND IN MOTION AT A REYNOLDS NUMBER OF FROM 3.4X10**3 TO 5X10**4 WHEREUPON THE RESULTING PARTICULATE CATALYST COMPOSITION (K) IS SEPARATED FROM THE INERT GAS.
Abstract:
Manufacture of particulate polyethylene by polymerizing ethylene in an agitated bed of dry particulate polyethylene by means of a catalyst system comprising (1) a particulate inorganic carrier and (2) a Ziegler catalyst applied to said carrier. The catalyst system is used in the form of an intimate mixture of the catalyst system with a particulate ethylene polymer having a softening point above the polymerization temperature used, the particles in said mixture being coated with an inert organic material which is solid at 30*C but liquid at the polymerization temperature used. This process makes it possible to obtain particulate polyethylene having a desirable particle size distribution.
Abstract:
CATALYST SYSTEM FOR THE POLYMERIZATION OF OLEFINS CONSISTING OF (1) A POWDERED INORGANIC CARRIER AND, APPLIED THERETO, (2) A ZEIGLER-TYPE CATALYST CONSISTING OF (2,1) A COMPONENT SELECTED FROM THE GROUP CONSISTING OF CHLORIDES, OXYCHLORIDES AND ALKOXYCHLORIDES OF TITANIUM, ZIRCONIUM AND VANADIUM AND (2.2) A COMPONENT SELECTED FROM THE GROUP CONSISTING OF SATURATED METAL ALKYLS, SATURATED METAL ALKOXYALKLS AND SATURATED METAL ALKYL HALIDES OF THE METALS ALUMINUM, MAGESIUM AND ZIND. THE CHARACTERIZING FEATURE OF THE CATALYST SYSTEM OF THE INVENTION IS THAT THE CARRIER (1) HAS BEEN OBTAINED BY HEATING A SUBSTANCE OF THE FORMULA
,H MG(SN(OH)6)
THIS CATALYST SYSTEM IS VERY EFFLICIENT AND ENABLES THE MOLECULAR WEIGHT OF THE POLYMERS TO BE WELL REGUALTED BY MEANS OF HYDROGEN.