Patent
Polymerization of olefins with dual, independently supported catalysts
Kirby Lowery,Fred L. Vance +1 more
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TLDR
In this article, a dual-catalyst approach was proposed for α-olefins in the presence of at least two independently supported catalysts, one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is inorganic oxide supported, chromium catalyst.Abstract:
Alpha-olefins are polymerized in the presence of at least two independently supported catalysts, one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is inorganic oxide supported, chromium catalyst. This dual catalyst increases catalyst efficiency and/or provides more flexible control of the properties of the resulting polymers.read more
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Ethylene interpolymer polymerizations.
TL;DR: In this paper, a new process of interpolymerizing ethylene inter-polymer products having improved properties, such as increased onset of crystallization temperature, is disclosed, in which a first homogeneous ethylene/alpha-olefin interpolymers and at least one second homogeneous polymers are combined in appropriate weight ratios resulting in the desired finished polymer structure.
Patent
Fabricated articles made from ethylene polymer blends
TL;DR: In this paper, the authors disclosed that at least one homogeneously branched linear or substantially linear polyethylene/α-olefin interpolymer has a density from 0.88 to about 0.935 g/cm3 and a slope of strain hardening coefficient greater than or equal to about 1.3.
Patent
Ethylene polymer film made from ethylene polymer blends
TL;DR: In this paper, the impact and tensile properties of formulated ethylene polymer compositions are disclosed, showing that they have surprisingly good impact properties and a good combination of modulus and toughness.
Patent
Mixed chromium catalysts and polymerizations utilizing same
TL;DR: In this paper, the mixed catalyst compositions of the invention are useful for the preparation of polyolefins and are particularly useful for polymerization of ethylene in particle form polymerizations to produce high density polyethylene blow molding resins having good processability and physical properties.
Patent
Multi-component polyolefin catalysts
Rimantas Glemza,Warthen John L +1 more
TL;DR: In this paper, a monolithic multi-component composite polyolefin catalyst particle comprising at least two distinct supported catalyst components is presented, where each catalyst component is capable of producing a resin having a melt index different from at least one other catalyst component under constant reaction conditions.
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Patent
Olefin polymerization with chromium and titanium-containing compounds
John P. Hogan,Donald R Witt +1 more
TL;DR: In this paper, the authors proposed to add to a support a chromium-containing compound using an aqueous medium and then adding a titanium-containing compounds using a nonaqueous medium.
Patent
High efficiency catalyst for polymerizing olefins
TL;DR: In this paper, a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and/or a titanium tetrahalide such as titanium tetrachloride and a titaniumoxydihalide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organo-aluminum compound, such as triethyl aluminum and a halide source such as ethyl aluminum dichloride.
Patent
Catalyst, method and polymerization processes
TL;DR: In this paper, a method of polymerizing olefins with this catalyst and the process of preparing the catalyst is described. But this method requires the use of a mixture of a finely divided support such as silica, alumina, zirconia or thoria.
Patent
Titanium-modified silyl chromate catalysts for ethylene polymerization
TL;DR: In this article, a silyl chromate was used as a catalyst for the preparation of ethylene polymers having higher melt indexes, which consisted of silyls on a silica support containing both aluminum and titanium.