Method for the production of low density polyethylene

Details Method for the production of low density polyethylene Method for the production of low density polyethylene

1977-04-06

1978-12-05

Holler, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

526 75, 526124, 526125, 526348, 5263486, C08F 402, C08F 464, C08F21000, C08F29708

Patent

active

041286073

ABSTRACT:
In producing a low density polyethylene by copolymerization in slurry state of ethylene and an .alpha.-olefin with use of a catalyst consisting of a supported titanium component and an organoaluminum compound, a certain amount of ethylene is subject to pre-polymerization in the presence of said catalyst prior to the copolymerization. Successively, the copolymerization of ethylene and an .alpha.-olefin is effected in a two-step process, in which a copolymerization ratio of .alpha.-olefin to ethylene is kept at a low level in the first step and raised to a high level in the second step thereby to obtain a low density polyethylene having a density of not higher than 0.945 g/cm.sup.3.

REFERENCES:
patent: 3067183 (1962-12-01), Hagemeyer, Jr. et al.
patent: 3404096 (1968-10-01), Lamborn
patent: 3575948 (1971-04-01), Blunt
patent: 3676415 (1972-07-01), Diedrich et al.
patent: 3789036 (1974-01-01), Longi et al.
patent: 3917575 (1975-11-01), Matsuura et al.
patent: 4004071 (1977-01-01), Aishima et al.
patent: 4027089 (1977-05-01), Aishima et al.
"Copolymerization," Ed. by G. E. Hain, Interscience, New York (1964), pp. 96-99, 103-106, and 245-247.

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