C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/6578
C08F 297/08 (2006.01)
Patent
CA 1142677
Abstract of the Disclosure In a process for producing a chemically blended pro- pylene resin composition having an ethylene content of about 1 to about 40 mole% based on the entire monomer units of the resin composition which comprises (i) a pre-polymerization step, and (ii) a multiplicity of subsequent polymerization steps, the improvement wherein (I) the pre-polymerization step (i) is either (I-A) a step wherein about 1 to about 1500g, per millimole of titanium atom, of ethylene is polymerized, (I-B) a step wherein about 1 to about 1500g, per millimole of titanium atom, of propylene is polymerized, or (I-C) a step wherein about 1 to about 1000g, per millimole of titanium atom, of an alpha-olefin having 4 to 10 carbon atoms is poly- merized, and (II) said multiplicity of polymerization steps (ii) are the following steps (II-l), (II-2) and (II-3) which are carried out in separate reaction zones different from the reaction zone of the pre-polymerization step (i) in this order or in the order of (II-l), (II-3) and (II-2), (II-l) a step of polymerizing propylene to form not less than about 5000g, per millimole of titanium atom, of crystalline polypropylene hav- ing an isotactic index of at least 90 which accounts for about 55 to about 95% by weight of the final resin composition, provided that when step (I-B) is employed as the pre-polymeri- zation step (i), the amount of the product includes that of polypropylene formed in step (I-B), (II-2) a step of polymeri- zing propylene and ethylene to form an amorphous or a low- crystalline propylene/ethylene copolymer containing about 20 to about 80 mole% of propylene units, and (II-3) a step of polymerizing ethylene, or both ethylene and propylene, to form crystalline polyethylene or a crystalline ethylene/propylene copolymer containing up to about 20 mole% of propylene units.
362391
Masaki Susumu
Mineshima Hideo
Sato Nobuo
Mitsui Chemicals Inc.
Smart & Biggar
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