Preparation of homo- and copolymers of propene by means of a Zie

Details Preparation of homo- and copolymers of propene by means of a Zie Preparation of homo- and copolymers of propene by means of a Zie

1992-08-25

1994-02-22

Lipman, Bernard

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526351, 502107, 502125, 502127, C08F 464

Patent

active

052888240

ABSTRACT:
Polymers of propene are prepared using a Ziegler-Natta catalyst system comprising (1) titanium component which is based on a finely divided, shape-imparting silica gel and contains titan- ium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component. The process employs a titanium component (1) which is obtained by a method in which (1.1) first (I) a carrier is prepared from (Ia) a silica gel which has a relatively high moisture content, (Ib) an organomagnesium compound and (Ic) a gaseous chlorinating agent in a manner such that (1.1.1) first (Ia) is reacted with (Ib), (1.1.2) then (Ic) is passed into the mixture obtained from (1.1.1), (1.2) then a solid-phase intermediate is prepared from (I), (II) an alkanol, (III) titanium tetrachloride and (IV) a phthalic acid derivative in a manner such that (1.2.1) first (I) is reacted with (II), (1.2.2) then (III) is introduced into the mixture resulting from (1.2.1), with the proviso that (IV) is also introduced in (1.2.1) or (1.2.2), (1.3) then the solid-phase intermediate resulting from (1.2) is extracted with titanium tetrachloride or with a titanium tetrachloride/-hydrocarbon mixture and (1.4) finally the solid-phase product resulting from (1.3) is washed with a liquid hydrocarbon.

REFERENCES:
patent: 4857613 (1989-08-01), Zolk et al.
patent: 5081088 (1992-01-01), Koelle et al.
patent: 5126302 (1992-06-01), Masino

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