Another process multistage polymerization consists of the following steps: Preferably in step a a propylene homopolymer is produced. The results are shown in Table 2. The process according to claim 19, wherein the alpha-olefin is ethylene or 1-butene. A metallocene compound of bridge type of formula I. The above processes are preferably carried out in an aprotic, polar or apolar solvent. Preferably step b is carried out in gas phase, preferably in a fluidized or stirred bed. Propylene polymerization in gas phase:
Said hydrocarbon solvent can be either aromatic e. Round flask equipped with KPG stirrer 6. Step a may be effected in the presence of hydrogen. Se suspende el residuo en 20 ml de tolueno, se agita a temperatura ambiente durante 15 min y se filtra. The catalysts of the present invention may also be supported on an inert support. The inorganic support material can also be chemically modified. When present, non-conjugated dienes are preferably incorporated into the polymer in an amount between 0.
And other high molecular weight which can be used to print 3d syndiotactic polypropylene resin and its preparation method and application. Allow to warm the resulting mixture to room temperature, stirred for 16 h.
The metallocene compound according to any one of claimshaving the formula II or IIa: Non-conjugated dienes may be linear hydrocarbon dienes, branched chain or cyclic, having from 6 to 20 carbon atoms.
A suitable class of supports which can be used is that constituted by porous organic supports functionalized with groups having active hydrogen atoms.
El bloque F de la tabla periodica by laudys escanio on Prezi
The residual solid 3 times at 60 with 20 ml of toluene each time 3 x 30 min stirring is washed. Heterocyclic metallocene compounds and use thereof in catalyst systems for producing olefin polymers. The preferred ligand has formula IIIa: The solvent was evaporated.
Furthermore, the molecular weight of the propylene copolymer obtained with the metallocene of the present invention is considerably higher.
The metallocene compounds of formula I object of the present invention esrie particularly suitable for the homo- and copolymerization of propylene. The weighted sample mg in sealed aluminum foil, heated to C and maintained at this temperature for a sufficient time 5 minutes to achieve complete melting of all the crystallites.
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All compounds disclosed in these documents are able to polymerize alpha olefins, particularly propylene. Preferred comonomers are propylene and 1-butene. Hydrogen can be added at the beginning of the polymerization reaction or may be added in a later step, after the prepolymerization step has been performed. Metallocene compounds are well known in lantanids art as catalyst components for olefin polymerization.
Preferably the polymerization medium is liquid propylene. Organometallic transition metal compound, biscyclopentadienyl ligand system, catalyst system and preparation of polyolefins.
The polymerization pressure is generally between 0. This is achieved by depositing the metallocene compound a or ex product of the reaction thereof with the component bor the component b and then the metallocene compound a on an inert support. Se deja calentar la mezcla resultante a temperatura ambiente, se agita durante 16 h.
A solution of 0. Homopolymerizations were carried out in a reactor of 10 1 in which were introduced 3. A catalyst system for olefin polymerization can be prepared by contacting: It is possible to use functionalized polymer supports, p.
Data polymerization are listed in Table 4. Se suspende el residuo en 20 ml de tolueno, se agita a temperatura ambiente durante 15 min y se filtra.
Elementos d’o bloque f
After the last filtration, the reaction product is transferred with some toluene into a glass frit size P3 and refiltered. The lower the polymerization temperature, the greater the resulting molecular weights of the polymers obtained. The hydrocarbon solvent may be aromatic, for example toluene, or aliphatic, such as propane, hexane, heptane or aactinidos.
Se prepara el sistema de catalizador del modo indicado en el anterior ejemplo 6 empleando el A Aluminum Free monocyclopentadienyl metallocene catalysts for olefin polymerization. The metallocene compounds of formula I can be obtained by a process comprising the steps of reacting the dianion with a suitable transition metal source, for example a metal tetrahalide, such as zirconium tetrachloride.
Metallocene compounds, catalyst compositions comprising the same, and method for preparing olefin periodia using the same.
However, the substituent in position 4 is defined only generically and the compounds mentioned in the examples is always a hydrogen atom atom. Metallocenes compounds preferably have the formula II or IIa. This feature is even more important if it is considered that the molecular weight of the obtained polymer does not influence greatly periodoca addition and remains very high for industrial practice, even in the presence of high amounts of hydrogen.
The inorganic support material can also be chemically modified. Catalyst system, useful for the production of polyolefins, comprises a metallocene, a Lewis base, a support and a compound containing at e one Group 3 element.
The catalyst system of claim 15 further comprising d an inert carrier.