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467 results about "Ziegler–Natta catalyst" patented technology

A Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, is a catalyst used in the synthesis of polymers of 1-alkenes (alpha-olefins). Two broad classes of Ziegler–Natta catalysts are employed, distinguished by their solubility...

Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene

The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of polypropylene in a bulk loop reactor by sequentially introducing Ziegler-Natta and metallocene catalyst systems into the bulk loop reactor. In one embodiment, separate catalyst mixing systems are used to introduce a quantity of metallocene catalyst and Ziegler-Natta catalyst into the bulk loop reactor. The frequency rate at which the quantity of metallocene catalyst is introduced into the bulk loop reactor may be higher than the frequency rate at which the quantity of Ziegler-Natta catalyst is introduced. In another embodiment, a method of polymerizing propylene in a bulk loop reactor is provided which includes contacting a quantity of supported metallocene catalyst with a first quantity of scavenger, such as TEAL and or TIBAL, prior to injecting the supported metallocene catalyst into the bulk loop reactor and contacting a quantity of Ziegler-Natta catalyst system with a second quantity of scavenger prior to injecting the Ziegler-Natta catalyst system into the bulk loop reactor, wherein the second quantity of scavenger is greater that the first quantity of scavenger. In another embodiment, a method of contacting a flow of metallocene with a flow of propylene is provided. This method includes directing the flow of metallocene towards a junction, directing the flow of propylene towards the junction and maintaining a portion of the flow of metallocene separate from a portion of the flow propylene within a portion of the junction downstream of the flow of propylene into the junction. In another embodiment, a method of introducing a quantity of antifouling agent into a catalyst mixing system is provided. In this embodiment a portion of the antifouling agent is introduced at or downstream of a point of contact of a stream of propylene with a stream of catalyst. The antifouling agent may be a member, alone or in combination with other members, selected from the group consisting of Stadis 450 Conductivity Improver, Synperonic antifouling agent, and Pluronic antifouling agent.

High-melt-strength propylene/ethylene/butene copolymer and preparation method thereof

The invention provides a method for adopting a direct polymerization method to prepare a high-melt-strength propylene/ethylene/butene random copolymer. The method comprises during different polymerization reaction stages of series connection operation, controlling categories and proportions of external electron donor components in a Ziegler-Natta catalyst system at different reaction stages according to the requirements of different molecular weight fractions, so that the propylene/ethylene/butene random copolymer with wide molecular weight distribution and extremely high molecular weight fractions can be prepared. The invention further correspondingly provides the propylene/ethylene/butene random copolymer with high melt strength. Compared with homopolymerized high-melt-strength polypropylene, the propylene/ethylene/butene random copolymer has good mechanical property and optical performance, extremely low melting point and extremely high melt strength and is suitable for preparing high-magnification foaming products, post processing energy consumption is low when the propylene/ethylene/butene random copolymer is applied to molding of high-magnification foaming beads, and the foaming beads are high in adhesion strength and good in toughness.
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