摘要:
Bis(di-, tri- or tetra-substituted-cyclopentadienyl)zirconium dihalides represented by the following general formula [I] are provided, ##STR1## (wherein R.sup.1 denotes a substituent group on the cyclopentadienyl ring which is an alkyl radical of 1 to 5 carbon atoms; R.sub.2.sup.1 --C.sub.5 H.sub.3 stands for a di-substituted cyclopentadienyl radical; and X is a halogen atom).This compound, when combined with an aluminoxane repesented by the following general formula [VII], gives a high-activity catalyst for the synthesis of polyolefins, ##STR2## (wherein m is an integer of 4 to 20; and R.sup.2 denotes a hydrocarbyl radical).
摘要:
A solid catalyst component for olefin polymerization having a high polymerization activity and affording a highly stereoregular polymer having a good particulate form, and a process for producing the same are provided, which component indispensably contains Mg, Ti, Al, halogen and alkoxy group; has two absorption peaks (absorbances A.sub.1 and A.sub.2) at specified wavenumbers within a specified region of spectra according to infrared spectrophotometry, A.sub.1 /A.sub.2 and A.sub.1 /A.sub.3 (A.sub.3 : an absorbance at a specified wavenumber) being each in a specified range; and has X-ray diffraction spectra distinctive from those of Mg halide or its complex with electron donor, and which process consists of step I of dissolving (a) anhydrous Mg dihalide, (b) a specified orthotitanic or polytitanic acid ester and (c) a specified alcohol in an inert hydrocarbon solvent to prepare component A; step II of mixing and reacting component A with component B consisting of (d) a specified organic acid ester, (e) a specified Al halide and (f) a specified Si halide to prepare solid product (I); and step III of reacting solid product (I) with component C consisting of (g) a specified Ti halide and/or (h) a specified vanadyl or vanadium halide to obtain solid product (II) as the objective catalyst component.
摘要:
Disclosed is a process for the preparation of metallocone complexes wherein stereoisomers of metallocene complexes formed at the time of synthesis can easily be separated. The gist of the present invention resides in separation of a part of an isomeric mixture of specific metallocene complexes bridged with a transition metal represented by the formula (1) as a complex having M—O bond. In particular, preferable is a process for separating a part of an isomeric mixture of a metallocene complex represented by the formula (2) as a &mgr;-oxo-complex represented by the formula (3).
摘要:
Disclosed are &mgr;-oxo-bis-metallocene complex compounds, catalysts for the polymerization of olefins comprising a &mgr;-oxo-bis-metallocene complex compound and at lease one cocatalyst selected from the group consisting of an aluminoxane, an ionic compound, and a Lewis acid, and a process for the polymerization of olefins. An example of the &mgr;-oxo-bis-metallocene complex compound is represented by the following formula (1): wherein, for example, M is zirconium, n is 1, Y is silicon, X is chloro, and R1-R10 maybe hydrogen or alkyl.
摘要:
An improvement in the method for producing ethylene polymers by using a catalyst consisting of a combination of a following solid product with an organoaluminum compound is provided.Said solid product (III) is prepared by reacting a trivalent metal halide with a divalent metal compound; reacting the resulting reaction product with a transition metal compound in the form of liquid; reacting the resulting solid product (I) with an aluminum or boron alcoholate; and reacting the resulting solid product (II) again with a transition metal compound in the form of liquid to obtain said solid product (III).Ethylene polymers obtained according to this method have broader molecular weight distributions.
摘要:
A process for producing polyethylene having a superior form and a narrower molecular weight distribution with a higher polymer yield is provided. In this process, a combination of a solid product (II) with an organoaluminum compound is used as a polymerization catalyst. This solid product is prepared by first reacting a trivalent metal halide with a divalent metal compound to form a solid product (I), which is then reacted with a halogen-containing transition metal compound and a halogen-free transition metal compound in the presence of a polysiloxane.
摘要:
This invention relates to a battery pack composed of a plurality of flat type gas depolarizable galvanic cells such as the zinc-air battery system and its packaging method for such battery pack. More specifically, projections of a certain value of height are formed on at least one of the outer surfaces of the positive and negative terminals of the flat type gas depolarizable galvanic cells and a hydrophobic membrane of a certain value of Gurley number is employed in each cell in the battery pack.
摘要:
A process for producing polyolefins having a high stereoregularity, no smell and a good particulate form, without needing removal of catalyst residue contained in the resulting polyolefins, which process comprises polymerizing olefins by the use of a catalyst obtained by combining a solid product (II) as a solid catalyst component prepared through the following reaction steps I, II and III, with an organoaluminum compound component and an organic silicon compound component having Si-O-C bond: Step I of mixing and dissolving .circle.a an anhydrous Mg dihalide, .circle.b a specified orthotitanic acid ester or/and a specified polytitanic acid ester and .circle.c a saturated or unsaturated, mono- or polyhydroxy alcohol of 1.about.20 C in an inert hydrocarbon solvent to obtain a component (A), Step II of mixing (A) with a component (B) consisting of .circle.d an aliphatic or aromatic monocarboxylic acid ester, .circle.e a specified halogenated aluminum and .circle.f a specified halogenated silicon to obtain a solid product (I), and Step III of reacting (I) with a component (C) consisting of .circle.g a specified halogenated titanium or/and .circle.h a specified halogenated vanadyl or a specified vanadium halide to obtain the solid product (II).
摘要:
A carrier for olefin polymerization catalysts (or catalyst components) which is in spherical form and has a narrow particle size distribution is produced by reacting an anhydrous magnesium dihalide with an alcohol or a phenol in an inert organic solvent to obtain a complex compound; suspending this complex compound with vigorous stirring in the presence of a nonionic surfactant in an inert organic solvent at the melting point of the complex compound or higher; and adding an organoaluminum compound or a silicon halide to the suspension to react them to thereby form spherical solids.
摘要:
A method for producing .alpha.-olefin polymers is provided. This method provides products having superior properties such as higher bulk density and uniform particle form which is close to sphere, with such an extremely higher catalyst efficiency that ash-removal step can be omitted without fear of coloring. The characteristic point of this method is in the improvement of conventional catalyst obtained by reacting a trivalent metal halide with a divalent metal hydroxide, oxide or carbonate or a double salt containing foregoing compounds or a hydrate of a compound containing a divalent metal to form a solid product (I), reacting an electron donor with said product (I), reacting the resulting product with a compound of transition metal of the 4th a or the 5th a group to form a final solid product and combining an organoaluminum compound with said final product,the improvement consisting in that said final product is obtained by reacting said solid product (I), said electron donor and said compound of transition metal, in the coexistence of said electron donor and said compound of transition metal.