摘要:
A process for the preparation of a solid catalyst component for the homo or copolymerization of olefins which comprises Mg, Ti, halogen and an electron donor selected from cycloalkyl ethers, said process comprising (a) dissolving a Mg based compound and a TiCI 3 based compound in a liquid medium further comprising a cycloalkyl ether and a compound of formula R 2 OH where R 2 is a C 1 -C 20 hydrocarbon group, in which the Ti/Mg molar ratio ranges from 0.1 to 0.5, the cycloalkyl ether/Mg ratio ranges from 1 to 4 and the R 2 OH/Mg molar ratio ranges from 1 to 4; and (b) adding, to the solution coming from step (a), SiCI4 in an amount such that the R 2 OH/SiCI4 molar ratio ranges from 0.5 to 1.5 and maintaining the temperature in the range 50-150°C thereby allowing precipitation of the solid catalyst component particles.
摘要:
The present invention relates to a process for the preparation of branched polyolefins having pending polar functionalities via the copolymerization of first an olefin monomer and second an olefin monomer comprising a main group metal hydrocarbyl functionality agent. The invention moreover relates to branched polyolefin having short chain branches with polar functionalities.
摘要:
Novel copolymers having a density (D) in the range 0.895 - 0.910 g/cm 3 , a melt index MI 2 (2.16 kg, 190°C) in the range of 0.01 - 6 g/10 min, a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and a sealing initiation temperature (SIT) and density (D) satisfying the relationship SIT ≤ (A x D) - B wherein A is 800°C x cm 3 /g and B is 650°C, wherein the SIT (°C) is determined on a 70 μm film at 0.5N/15 mm and D Is in units of g/cm 3 are disclosed. The copolymers may be suitably prepared by use of metallocene catalyst systems and may be used in film applications, in particular as sealing layers for packaging applications.
摘要:
Supported catalyst compositions, useful in olefin polymerization, and having improved flow properties are disclosed. The catalyst compositions may be characterized by low macro pore volume and high bulk density. Methods for preparing the catalyst compositions are also disclosed.
摘要:
Modified chromium-based catalyst compositions for olefin polymerization are disclosed. The modifiers prevent or reduce catalyst particle aggregation providing improved catalyst particle dispersion and consistent flow index response of the compositions in olefin polymerization.
摘要:
Modified chromium-based catalyst compositions for olefin polymerization are disclosed. The modifiers prevent or reduce catalyst particle aggregation providing improved catalyst particle dispersion and consistent flow index response of the compositions in olefin polymerization.
摘要:
Methods for controlling properties of an olefin polymer using an organozinc compound are disclosed. The HLMI/MI shear ratio of the polymer can be decreased and the Mz/Mw ratio of the polymer can be increased via the addition of the organozinc compound.
摘要:
A polymerization process is disclosed, including: providing a reactor component suspended in a hydrocarbon gel; introducing the reactor component to a polymerization reactor; and polymerizing an olefin in the polymerization reactor to form an olefin-based polymer. Another polymerization process is disclosed, including: providing a hydrocarbon gel comprising a reactor component suspended therein; combining the hydrogen gel with an additional reactor feed; introducing the combined mixture of the hydrocarbon gel and the additional reactor feed to a polymerization reactor; and polymerizing an olefin in the polymerization reactor to form an olefin-based polymer. A hydrocarbon gel is disclosed, including: a liquid hydrocarbon; a gelling agent; and a reactor component.
摘要:
A phosphinimine catalyst immobilized on a passivated inorganic oxide support, had high activity at low co-catalyst concentrations and gave, under gas phase polymerization conditions, ethylene copolymer with a high molecular weight. A method of making a passivated silica support involves treatment of silica with an organoaluminum compound, a diorganomagnesium compound and a source of chloride (to make MgCl 2 ) under anhydrous conditions and in the absence of polar solvents.
摘要:
Multi-metallic organometallic complexes that allow performance of olefin based reaction and in particular polymerization of olefins to produce polyolefin polymers, and related methods and systems are described.