Preparation of propylene/ethylene block copolymers

Details Preparation of propylene/ethylene block copolymers Preparation of propylene/ethylene block copolymers

1982-11-01

1984-06-19

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

575247, 575270, 575323, C08F29708

Patent

active

044554052

ABSTRACT:
Propylene/ethylene block copolymers are prepared by a process in which, in an agitated bed comprising small polymer particles, first (I) propylene is homopolymerized from the gas phase, in a first polymerization zone, by feeding in a Ziegler-Natta catalyst comprising (1) a titanium(III) component and (2) a dialkyl-aluminum chloride component, with or without (3) a further catalyst component, and then (II) the product obtained in the first polymerization zone is fed into a second polymerization zone, where a mixture of propylene and ethylene is polymerized with the propylene homopolymer present in this product.
In this process, the Ziegler-Natta catalyst employed contains a titanium(III) component (1) which is prepared by subjecting (1.1) a titanium-containing compound (a) of the formula TiCl.sub.3. nAlCl.sub.3 and (1.2) an electron donor (b), consisting of (b.sub.1) an ester of a particular class or (b.sub.2) a phosphorus-containing compound of a particular class, to a special milling procedure, the particular features of which are special metering and temperature conditions, suspending the resulting intermediate in a mixture of a liquid hydrocarbon (c) and an oxygen-containing compound (d), comprising (d.sub.1) an ether of a certain class and/or (d.sub.2) an ester of a certain class, and then heating the suspension obtained. The solid remaining in suspension is the titanium(III) component (1) which is to be employed for the polymerization. The polymer obtained has improved morphological properties.

REFERENCES:
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patent: 4309521 (1982-01-01), Sato
patent: 4316966 (1982-02-01), Mineshima
patent: 4339557 (1982-07-01), Hasuo
patent: 4368304 (1983-01-01), Sato
patent: 4370449 (1983-01-01), Bye

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