Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1991-12-09
1993-05-04
Lesmes, George F.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
526 88, 526125, 526126, 526901, 526904, 526908, C08F 444, C08F 406, B32B 516
Patent
active
052081095
ABSTRACT:
The present invention relates to a process for polymerizing or copolymerizing alpha-olefins comprising, on the one hand, a prepolymerization stage by contacting one or more alpha-olefins with a Ziegler catalyst system consisting of a solid catalyst containing essentially atoms of halogen, magnesium and transition metal, and a co-catalyst consisting of an organometallic compound, and, on the other hand, a polymerization or copolymerization stage in a gas phase process by means of a fluidized bed, by contacting one or more alpha-olefins with the prepolymer produced in the first stage, process characterized in that the alpha-olefin prepolymer and polymer or copolymer are in the form of a powder consisting of particles having specific values for the transition metal content and the mean diameter by mass, and characterized in that the particle size distribution of the prepolymer is narrow and easily controlled.
REFERENCES:
patent: 3922322 (1975-11-01), Roger et al.
patent: 3954909 (1976-05-01), Havas et al.
patent: 4165298 (1979-08-01), Shiga et al.
patent: 4243786 (1981-01-01), Shiga et al.
patent: 4370257 (1983-01-01), Imai et al.
patent: 4517246 (1985-05-01), Matsuyama et al.
patent: 4564605 (1986-01-01), Collomb-Ceccarini et al.
patent: 4703094 (1987-10-01), Raufast
patent: 4774299 (1988-09-01), Dumain et al.
patent: 4857611 (1989-08-01), Durand et al.
patent: 4882400 (1989-11-01), Dumain et al.
patent: 4902483 (1990-02-01), Raufast
patent: 4921920 (1990-05-01), Collomb-Ceccarini et al.
patent: 5059570 (1991-10-01), Bailly et al.
patent: 5077358 (1991-12-01), Durand et al.
L. L. Bohm, Ethylene Polymerisation Process with a highly active Ziegler-Natta catalyst: Polymer 1978, vol. 19, May-Germany.
P. Galli, L. Luciani et G. Cecchin, Advances In The Polymerization Of Polyolefins With Coordination Catalyst, Die Angewandte Makromolekulare Chemie 94 (1981) pp. 63-89.
Bailly Jean C.
Blaya Alain
Crouzet Pierre
Havas Laszlo
Sandis Stylianos
BP Chemicals Limited
Lesmes George F.
Morris Terrel
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