Patent
Supported catalyst for 1-olefin(s) (co)polymerization
TLDR
In this paper, a trialkylaluminum compound with a transition metal metallocene was used for the polymerization of olefins and a method for its production.Abstract:
This invention relates to a supported catalyst composition useful in the polymerization of olefins and to a method for its production. The catalyst is formed by first reacting a trialkylaluminum compound with a transition metal metallocene, and subsequently reacting the resulting material with the undehydrated support material to form a solid product containing at least 20 grams of support material per milimole of transition metal. The resulting supported catalyst has a level of activity comparable to that of conventionally made supported catalysts which are achieved at active metal loadings which are reduced from the loadings used in the previously known metallocene-alumoxane catalysts by at least 20 %, and preferably 50 %. The invention particularly relates to the use of undehydrated silica gel containing from 6 to 20 per cent by weight adsorbed water as the catalyst support material.read more
Citations
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Polymerization catalyst systems, their production and use
TL;DR: In this article, a supported metallocene catalyst system that does not require an activator or cocatalyst for the polymerization of olefins was proposed, which is useful for polymerizing olefs.
Patent
Polymerization catalyst systems, their production and use
TL;DR: In this paper, a supported metallocene catalyst and alumoxane activator were used for polymerizing olefins, which when utilized in a polymerization process substantially reduced the reactor fouling and sheeting.
Patent
Propylene olefin copolymers
TL;DR: Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, comprising crystallizable alphaolefin sequences are provided in this article.
Patent
Process and a catalyst for preventing reactor fouling
TL;DR: In this paper, a support containing methylalumoxane and derivatives thereof is described, which is formed by an incipient impregnation technique, and the most preferred support is silica.
Patent
Process for controlling the mwd of a broad/bimodal resin produced in a single reactor
TL;DR: In this article, a bimetallic catalyst produces broad or bimodal molecular weight distribution polyolefin resin whose composition depends on the ratio of the concentration of the two metals of the catalyst producing the HMW and LMW components.
References
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Patent
Supported polymerization catalyst
TL;DR: An olefin polymerization catalyst comprising (a) a supported transition metal containing component, (b) a cocatalyst comprising an alumoxane and an organometallic compound of a metal of Groups IA, IIA, IIB, or IIIA of the Periodic Table.
Patent
Method for preparing a supported metallocene-alumoxane catalyst for gas phase polymerization
TL;DR: In this paper, a process for preparing a supported metallocene alumoxane catalyst for use in the gas phase polymerization of olefins is described, which is based on the use of silica gel containing from about 6 to 10 percent by weight adsorbed water as the catalyst support material.
Patent
Method for utilizing triethylaluminum to prepare an alumoxane support for an active metallocene catalyst
TL;DR: In this article, a process for preparing a supported metallocene alumoxane catalyst for use in the polymerization of olefins is described, where a silica gel containing from about 6 to about 20 per cent by weight adsorbed water is used as the catalyst support material.
Patent
Method for preparing polyethylene wax by gas phase polymerization
TL;DR: In this article, an alumoxane coated silica gel is formed to which a metallocene may be added and the resulting material dried to free flowing powder, and a trimethylaluminum pretreated metallocenes may be employed when the trialkylaluminum is selected from the group consisting of triethylaluminium, tripropylal aluminum, tri-n-butyl-aluminum, tri isobutylal aluminium, tri(2-methylpentyl)aluminum and trihexyl aluminum.