C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/613, 402/638
C08F 4/62 (2006.01) C08F 2/34 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)
Patent
CA 1126900
ABSTRACT OF THE DISCLOSURE A process is provided herein for preparing an ethylene-propylene copolymer having a melt index ranging from 0.01 to 10 and a density ranging from 0.910 to 0.945. In such process, ethylene and 6 to 100 mol% thereof of propylene are copolymerized in a substantially solvent-free vapor phase condition and in the presence of a catalyst consisting of a solid substance and an organoaluminum compound, the solid substance containing a magnesium- containing inorganic solid compound and a titanium compound and/or a vanadium compound. The polymerization reaction can be performed in extremely high activity and extremely stably with reduced production of coarse or ultra-fine particles, with minimized adhesion to the reactor and conglomeration of polymer particles. The copolymerization can be performed at relatively low temperatures to provide medium or low density ethylene copolymers having a high melt index. The copolymer formed has superior transparency and elasticity and has a high resistance to impact and environ- mental stress cracking. Thus, it can be formed into films, sheets, hollow containers, insulation for electric wires by the known methods of extrusion molding, blow molding, injection molding, press forming and vacuum forming. The films have the properties of excellent transparency, anti-blocking properties, heat sealing properties and flexibility. Because of its large elongation, extremely thin films may be formed. Because its crystallinity is high and its heat resistance is good, it forms an unsticky film of high transparency, useful for packing and agricultural uses.
337704
Kuroda Nobuyuki
Matsuno Mitsuo
Matsuura Kazuo
Miyoshi Mituji
Shiraishi Takeichi
Marcus & Associates
Nippon Oil Co. Ltd.
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