Process for producing chemically blended propylene resin composi

Details Process for producing chemically blended propylene resin composi Process for producing chemically blended propylene resin composi

1980-10-16

1982-02-23

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525240, C08F29708

Patent

active

043169660

ABSTRACT:
In a process for producing a chemically blended propylene 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 1500 g, per millimole of titanium atom, of ethylene is polymerized, (I-B) a step wherein about 1 to about 1500 g, per millimole of titanium atom, of propylene is polymerized, or (I-C) a step wherein about 1 to about 1000 g, per millimole of titanium atom, of an alpha-olefin having 4 to 10 carbon atoms is polymerized, and (II) said multiplicity of polymerization steps (ii) are the following steps (II-1), (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-1), (II-3) and (II-2), (II-1) a step of polymerizing propylene to form not less than about 5000 g, per millimole of titanium atom, of crystalline polypropylene having 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-polymerization step (i), the amount of the product includes that of polypropylene formed in step (I-B), (II-2) a step of polymerizing 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.

REFERENCES:
patent: 4048412 (1977-09-01), Caumartin et al.
patent: 4066718 (1978-01-01), Saito et al.
patent: 4076924 (1978-02-01), Toyota et al.
patent: 4085276 (1978-04-01), Toyota et al.
patent: 4128606 (1978-12-01), Furetachi et al.
patent: 4143223 (1979-03-01), Toyota et al.
patent: 4157435 (1979-06-01), Toyota et al.
patent: 4226741 (1980-10-01), Luciani et al.
patent: 4232139 (1980-11-01), Minami et al.
Derwent Abstract 17651A/10 (3/2/78).
Derwent Abstract 02827Y/02 (11/26/76).
Derwent Abstract 71468Y/40 (8/23/77).
Derwent Abstract 95431X/51 (11/5/76).
Derwent Abstract 55831R-A (7/30/70).
Derwent Abstract 60,797P (11/22/62).

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