Method for producing propylene copolymers using a catalyst activ

Details Method for producing propylene copolymers using a catalyst activ Method for producing propylene copolymers using a catalyst activ

1980-07-08

1981-12-08

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525247, 526119, 526139, 526140, 526141, 526142, 5263482, 5263483, 5263485, 5263486, 526904, C08F 466, C08F 1000

Patent

active

043048900

ABSTRACT:
A method for producing crystalline copolymers of propylene (major component), ethylene and an .alpha.-olefin having 4 to 12 carbon atoms, superior in any of various practical physical properties such as cold-resistance, transparency, heat-seal temperature, percentage shrinkage, etc. is provided, wherein a catalyst solution obtained by mixing together a titanium trichloride composition (obtained by mixing and milling a titanium trichloride with a mixed reaction product of TiCl.sub.4 with an ether), a dialkylaluminum halide, an electron-donor compound and an inert solvent, is activated in advance of copolymerization, by feeding propylene into the solution under specified feeding conditions, and copolymerization is carried out by feeding propylene and said .alpha.-olefin simultaneously and continuously, while feeding ethylene intermittently into the gas phase part of the polymerization zone containing the solution.

REFERENCES:
patent: 3530107 (1970-09-01), Yoshioka et al.
patent: 3669948 (1972-06-01), Konotsune et al.
patent: 3959409 (1976-05-01), Frese et al.
patent: 4086185 (1978-04-01), Shirai et al.

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