Preparation of homopolymers and copolymers of propene using a Zi

Details Preparation of homopolymers and copolymers of propene using a Zi Preparation of homopolymers and copolymers of propene using a Zi

1991-01-28

1992-11-10

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502120, 526129, 526125, 526351, 526901, C08F 4654, C08F 4656, C08F 1006

Patent

active

051624656

ABSTRACT:
Polymers of propene are prepared using a Ziegler-Natta catalyst system consisting of (1) a titanium component which is based on a finely divided, shape-imparting silica gel and contains, in addition to titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component. In this process, a titanium component (1) is used which is obtained by a method in which (1.1) first (I) a carrier is prepared from (Ia) a silica gel, (Ib) an alkanol, (Ic) an organomagnesium compound and (Id) a gaseous chlorinating agent by a procedure in which (1.1.1) first (Ia) is reacted with (Ib), (1.1.2) then the mixture obtained in (1.1.1) is combined with (Ic), (1.1.3) then (Id) is passed into the mixture obtained in (1.1.2) and (I) is isolated, (1.2) thereafter a solid-phase intermediate is prepared from (I), (II) an alkanol, (III) titanium tetrachloride and (IV) a phthalic acid drivative by a procedure in which (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 during (1.2.1) and/or (1.2.2), (1.3) then the solid-phase product resulting from (1.2) is extracted with titanium tetrachloride and (1.4) finally the solid-phase product resulting from (1.3) is washed with a liquid hydrocarbon.

REFERENCES:
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patent: 4431568 (1984-02-01), Miya et al.
patent: 4711865 (1987-12-01), Speca
patent: 4761461 (1988-08-01), Jaggard et al.
patent: 4766100 (1988-08-01), Best et al.

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