Process for the preparation of polypropylene
A polypropylene and catalyst technology, applied in the field of polypropylene preparation, can solve the problem that high melt stability polypropylene cannot be obtained and the like
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Embodiment 1
[0296] Embodiment 1 (comparison)
[0297] The silica-supported metallocene catalyst (1) was prepared according to WO 01 / 48034 (Example 27). The carrier had a porosity of 1.6 ml / g. The asymmetric metallocenedimethylsilyl [(2-methyl-(4'-tert-butyl)-4-phenyl-indenyl)(2-isopropyl-(4'-tert-butyl base)-4-phenyl-indenyl)] zirconium dichloride.
[0298] A 5 liter stainless steel reactor was used for propylene polymerization. 110 g of liquid propylene (Borealis polymerization grade) was added to the reactor, and 0.2 ml of triethylaluminum (100%, purchased from Crompton) as a scavenger and 3.7 mmol of hydrogen (mass 6.0, obtained from Crompton) as a chain transfer agent were added. supply). The reactor temperature was set at 30 °C. 21 mg of catalyst were flushed into the reactor with nitrogen overpressure. The reactor was heated to 60°C in about 14 minutes. Polymerization was continued for 30 minutes at 60°C, after which the propylene was rinsed out, the polymer was dried and we...
Embodiment 2
[0301] Embodiment 2 (comparison)
[0302] Catalyst (11) was prepared as described in Example 5 of WO 03 / 051934.
[0303] A 5 liter stainless steel reactor was used for propylene polymerization. 1100 g of liquid propylene (Borealis polymerization grade) was added to the reactor, and 0.1 ml of triethylaluminum (100%, purchased from Crompton) as a scavenger and 15 mmol of hydrogen as a chain transfer agent (mass 6.0, obtained by supply). The reactor temperature was set at 30°C and 21 mg of catalyst was flushed into the reactor with nitrogen overpressure. The reactor was heated to 70 °C in about 14 minutes, at 70 °C the polymerization was continued for 50 min, then propylene was flushed out, 5 mmol of hydrogen were added, and the reactor pressure was increased by adding (gaseous) propylene to 20bars. Polymerization was continued in the gas phase for 210 minutes, after which the reactor was flushed, the polymer was dried and weighed.
[0304] Weighed polymer output 790g, whic...
Embodiment 3
[0306] Embodiment 3 (creative)
[0307] The unsupported catalyst (III) has been prepared as described in Example 5 of WO 03 / 051934, while using the asymmetric metallocene dimethylsilyl [(2-methyl-(4'-tert Butyl)-4-phenyl-indenyl)(2-isopropyl-(4'-tert-butyl)-4-phenyl-indenyl)]zirconium dichloride.
[0308] A 5 liter stainless steel reactor was used for propylene polymerization. 1100 g of liquid propylene (Borealis polymerization grade) was added to the reactor, and 0.1 ml of triethylaluminum (100%, purchased from Crompton) as a scavenger and 3.7 mmol of hydrogen as a chain transfer agent (mass 6.0, obtained by supply). The reactor temperature was set at 30°C and 20 mg of catalyst was flushed into the reactor with nitrogen overpressure. The reactor was heated to 70°C in about 14 minutes. Polymerization was continued at 70°C for 30 minutes, after which the propylene was rinsed out, the polymer was dried and weighed.
[0309] Polymer yield was weighed = 390 g.
[0310] SHI@1...
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