Process for the preparation of a poly-1-olefin

Details Process for the preparation of a poly-1-olefin Process for the preparation of a poly-1-olefin

1994-11-03

1997-02-11

Wu, David W.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526352, 526901, 526904, 502 5, 502522, C08F 464

Patent

active

056022182

ABSTRACT:
A particularly uniform Ziegler catalyst in the form of spherical particles is obtained by using shock waves instead of a stirrer for the thorough mixing of the reactants. By means of this highly active catalyst based on a magnesium dialkyl, it is possible to obtain polymers in the form of spherical particles in the polymerization of alpha-olefins. A further advantage of the catalyst according to the invention is its high activity, which is such that only very small amounts of the catalyst are required for the polymerization. The residual content of titanium and/or zirconium in the polymers prepared according to the invention is less than 10 ppm. By virtue of its good responsiveness to hydrogen, the catalyst is suitable for the preparation of polymers with a broad bimodal molar mass distribution, particularly in two-stage processes. The replacement of sulfur-containing electron donors such as diethyl sulfite with alcohols such as ethanol has the effect of reducing the odor nuisance and increasing the number of possible uses of the polymer.
Considerable simplifications and advantages in handling, drying and processing are achieved as a result of the spherical shape of the particles and the very good flowability of the polymers and copolymers which is associated therewith.

REFERENCES:
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patent: 4363902 (1982-12-01), Kurz
patent: 4439539 (1984-03-01), Takitani et al.
patent: 4442225 (1984-04-01), Takitani et al.
patent: 4487846 (1984-12-01), Bailly et al.
patent: 4731227 (1988-03-01), Pulvari
patent: 4946816 (1990-08-01), Cohen et al.
Database WPI Derwent Publications Ltd., London, GB; AN 79-36804B POPOV 'ReactionB essel for processes in heterogeneous medium & SU A 613,799 (Power Res Inst) 1 Jun. 1978.

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