Preparation of homopolymers and copolymers of propene by means o

Details Preparation of homopolymers and copolymers of propene by means o Preparation of homopolymers and copolymers of propene by means o

1989-08-30

1991-04-09

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502125, 526125, 526129, 526351, 526909, C08F 4648, C08F 4654, C08F 4656

Patent

active

050066200

ABSTRACT:
Polymers of propene are prepared by means of a Ziegler-Natta catalyst system composed of (1) a titanium component based on a finely divided shape-dictating silica gel and containing titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component, the titanium component (1) being obtained by (1.1) first preparing (I) a carrier material from (Ia) a silica gel, (Ib) an organomagnesium compound (Ic) a gaseous chlorinating agent and (Id) a specific phthalic acid derivative by (1.1.1) first reacting (Ia) with (Ib), then (1.1.2) passing (Ic) into the product of (1.1.1) together with the phthalic acid derivative (Id) and isolating (I), (1.2) preparing a solid-phase intermediate from (I), (II) an alkanol and (III) titanium tetrachloride by (1.2.1) first reacting (I) with (II), then (1.2.2) introducing (III) into the product resulting from (1.2.1), then (1.3) extracting the solid-phase result from (1.2) with titanium tetrachloride or a titanium tetrachloride/ethylbenzene mixture, and finally (1.4) washing the solid-phase result from (1.3) with a liquid hydrocarbon.

REFERENCES:
patent: 4115319 (1978-09-01), Scata et al.
patent: 4442224 (1984-04-01), Takitani et al.
patent: 4857613 (1989-08-01), Zolk et al.

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