Method for producing a poly-1-olefin in the presence of a...

Details Method for producing a poly-1-olefin in the presence of a... Method for producing a poly-1-olefin in the presence of a...

2003-05-22

2008-07-22

Choi, Ling-Sui (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S124300, C526S352000, C526S348000, C502S103000, C502S113000, C502S115000

Reexamination Certificate

active

07402637

ABSTRACT:
The invention relates to a method for producing a poly-1-olefin by polymerization of a 1-olefin of the formula R4C═CH2, in which R4is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas the gas phase, at a temperature of from 20 to 200° C. and a pressure of from 0.5 to 50 bar, in the presence of a catalyst which consists of the product of the reaction of a magnesium alkoxide with a transition-metal compound (component a) and an organometallic compound (component b), whose component (a) has been produced by reacting a transitionmetal compound of titanium, zirconium, vanadium or chromium with a gelatinous dispersion of the magnesium alkoxide in an inert hydrocarbon. In accordance with the invention, the gelatinous dispersion is obtained by stirring, using a stirring element, or shearing, using a high-performance shearing tool, a suspension of a magnesium alkoxide powder having a mean particle size, expressed as the d50value, in the range from 50 to 1000 um, in an aliphatic hydrocarbon in which the magnesium alkoxide particles are insoluble. The suspension has, before conversion into the dispersion, been subjected to heat treatment at a temperature in the range from 40 to 150° C. over a period of from 10 to 100 hours.

REFERENCES:
patent: 3644318 (1972-02-01), Diedrich et al.
patent: 5648309 (1997-07-01), Böhm
patent: 7008898 (2006-03-01), Alt et al.
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patent: 0 532 551 (1993-03-01), None
patent: WO-91/18934 (1991-12-01), None
patent: WO-01/38405 (2001-05-01), None
Din 66 144:(5) pages, Mar. 1974 (In German).

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