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QUE ES LA SERIE LANTANIDOS Y ACTINIDOS EN LA TABLA PERIODICA

Se evapora el disolvente. The symmetry classes of metallocenes can be found on Resconi et al. Chemical compound, processes for their preparation and their use in catalyst systems for preparing polyolefins. When present, non-conjugated dienes are preferably incorporated into the polymer in an amount between 0. It resuspend the support 20 ml of toluene, is heated to 80 and stirred at this temperature for 30 min, before hot filtration. The solvent was evaporated.

If desired, they can be incorporated simultaneously more than one diene, for example HD and ENB, with total diene built located within the above defined limits. Such copolymers can be obtained in high yields by using a gas phase process, for example in a fluidized bed reactor or stirred bed. The olefin polymerization process according to the invention can be carried out in slurry or gas phase. Data polymerization are listed in Table 1. Paso b Step b. Metallocene compounds are well known in the art as catalyst components for olefin polymerization. The results are shown in Table 2. Preferred comonomers are ethylene and 1-butene.

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Aluminum Free monocyclopentadienyl metallocene catalysts for olefin polymerization. Todos los compuestos descritos en estos periofica son capaces de polimerizar las alfa-olefinas, en particular al propileno.

A multistage polymerization process consisting of the following steps: The results are shown in Table 2. The symmetry classes of metallocenes can be found on Resconi et al. The reactor was inerted with nitrogen prior to the introduction of material to be polymerised. Preferably the polymerization medium is liquid propylene. Preferred comonomers are perikdica and 1-butene.

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It resuspend the support 20 ml of toluene, is heated to 80 and stirred at this atinidos for 30 min, before hot filtration. Se prepara el sistema de catalizador del modo indicado en el anterior ejemplo 6 empleando el A Hydrogen can be added at the start of the polymerization reaction or may be added at a later stage after the prepolymerization step has been performed. All compounds disclosed in these documents are able to polymerize alpha olefins, particularly propylene.

The following examples al provided to illustrate, not to limit, the invention. The catalysts of the present invention may also be supported on an inert support.

Examples of compounds having the formula I as follows: Round flask equipped with KPG stirrer 6.

Another group of particularly suitable inert supports for use according to the invention is periodca by the porous polyolefin prepolymers, particularly polyethylene. The processes of the present invention can be carried out in a reactor or in two or more reactors in series.

Elementos d’o bloque f

Paso b Step b. The solvent was evaporated.

Metallocenes compounds preferably have the formula II or IIa. When the metallocene compounds of the present invention as catalyst component in a polymerization process is used, the activity of the catalyst system increases strongly with the presence of hydrogen.

The metallocene compounds of the present invention are also particularly suitable for preparing copolymers of ethylene and higher alpha-olefins, eg propylene, 1-butene, 1-hexene, 1-octene. The support can be a porous solid, the talc, a sheet silicate, an inorganic oxide or a finely divided polymer powder p.

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A metallocene compound of bridge type of formula I. Data polymerization are listed in Table 4. While still at room temperature the catalytic system obtained the above described the amounts of metallocene used is A-1 shown in Table 4 in the reactor using a further g of liquid propylene is injected mode. The multistage polymerization process according to claim 25, wherein step a1 further comprises a prepolymerization step a of. Examples of suitable conjugated dienes are not: At room temperature 0.

Transition metal compound, ligand system, catalyst system and the use of the latter for the polymerisation and copolymerisation of olefins. The results of the polymerization are shown in Table 3. 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.

Step a1 can be carried out in the presence of hydrogen. The alumoxanes used in the catalyst system according to the invention is considered to be linear or cyclic compounds, branched, containing at least one group of the type: Compounds containing boron atoms can be in suitably supported form according to the description of DE-A and DE-A with.