Abstract: A catalyst component for the polymerization of olefins which is prepared by contacting a reaction product of dihydrocarbyl magnesium and a halogen-containing alcohol held in contact with a titanium compound.

Abstract: A method for the prevention of fouling of metallic surfaces exposed to reactive alpha-olefin gases during the production of polymeric resins which comprise coating such metallic surfaces with an amino silicone fluid and thereafter curing said coating by hydrolysis to form a continuous solid coating.

Abstract: A method and system for regulating the isotacticity of polypropylene in a continuous process for manufacturing polypropylene by the polymerization of alpha-olefins in a fluidized bed reactor system using a model which correlates isotacticity values to catalyst productivity values. A catalyst productivity target value is computed using the model based upon a selected xylene solubles or isotactic index. The instantaneous catalyst productivity of the system is then determined by dividing product production rate by catalyst flow rate which is then compared to the catalyst productivity target value. When the comparison between the instantaneous catalyst productivity value and the catalyst productivity differ the molar feed ratio of SCA to alkyl is automatically adjusted until the catalyst productivity, and hence isotacticity, is changed approaching the target values.

Abstract: A catalyst consisting essentially of (A) a cobalt compound and (B) an organic phosphorus compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen atoms, alkyl groups or aryl groups, and three X's, which may be the same or different, are electron-donating groups. This catalyst is effectively used in a process for producing a conjugated diene polymer by polymerizing a conjugated diene in a hydrocarbon or halogenated hydrocarbon solvent in the presence of the above catalyst together with (C) an organoaluminum compound and (D) 0.25-1.5 mols, per mol of the organoaluminum compound (C), of water.

Abstract: A solid titanium catalyst component (A) of a catalyst system useful in the polymerization of olefins or copolymerization of two or more olefins or one or more olefins and a diene is prepared by contacting a liquid hydrocarbon solution of (i) a magnesium compound, such as magnesium chloride, with (ii) a liquid titanium compound, such as TiCl.sub.4, or a solution of a titanium compound in a hydrocarbon solvent, to form a solid product. The solid product is formed in the presence of (D) an electron donor, e.g. methyl formate, acetic acid, acetic anhydride, acetone, methyl ether, butyl Cellosolve, dimethyl carbonate, methyl silicate. The solid product is also contacted with a polycarboxylic acid ester, e.g. diethyl methylsuccinate. The polymerization or copolymerization of the olefin is carried out in the presence of the solid titanium catalyst (A) and (B) an organometallic compound of a Group I to III metal and (C) an organic silicon compound having an Si--O--C bond.

Abstract: Process for adjusting the cis-trans-double bond configuration in polyalkenamers produced by ring-opening polymerization of cis,cis-1,5-cyclooctadiene or 2-norbornene wherein the polymerization is performed in the presence of isoprene and/or a cyclic olefin with a double-bond pair in the 1,3-position.

Abstract: A modified supported catalyst for polymerizing alpha-olefins, for example, ethylene, is prepared by combining a chromium compound-containing catalyst with a modifier which is an oxide of an element of Group II A of the Periodic Chart of the Elements. The resulting modified catalyst composition, when used to polymerize alpha-olefins, produces polymer resins having higher values of High Load Melt Index (I.sub.21) than catalyst compositions without the modifier.There is also disclosed a process for polymerizing alpha-olefins, at relatively lower temperatures than was heretofore possible, to obtain resins of relatively high HLMI, using the above-identified modified catalyst composition. The resulting polymers can be used for the fabrication of blow-molded products, e.g., household and industrial containers.

Abstract: The viscosity of the dispersing medium, such as cyclohexane, in the anionic dispersion polymerization of monomers, such as styrene, is increased by adding a higher viscosity inert miscible liquid, such as hexadecane, or a soluble inert solid, or by using a liquid having a viscosity of greater than about 2 cp. The increased viscosity assists in the formation of dispersed polymer particles having a narrower particle size distribution than those produced in the lower viscosity dispersing medium.

Abstract: A process for producing a polyolefin having a multimodal molecular weight distribution wherein the polymerization is conducted in the presence of hydrogen and a catalyst system containing aluminoxane and at least two different metallocenes each having different olefin polymerization termination rate constants in the presence of hydrogen, and the process of producing the catalyst system.

Abstract: Polyolefin reactor blends obtained by polymerization of ethylene and higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes and alumoxane.

Abstract: A process for the polymerization of olefins comprises contacting at least one olefin with a catalyst prepared by impregnating a support with an aqueous solution of a magnesium compound, drying, treating the dried support with a chlorinating agent, then treating with alcohol, then treating with an etching agent capable of removing residual alcohol, then activating with a halide or haloalkoxide of Ti.

Abstract: Polyolefins having a broad molecular weight distribution are obtained by polymerizing ethylene or higher alpha-olefins in the presence of a catalyst system comprising two or more metallocenes each having different propagation and termination rate constants and alumoxane.

Abstract: Process for the preparation of optically active polyolefins by polymerizing olefins of the formula CH.sub.2 .dbd.CHR in which R.dbd.C.sub.1 C.sub.10 -alkyl in the presence of an optically active catalyst system composed of an optically active transition metal compound containing only enantiomer (R- or S-form) of a stereorigid, chiral transition metal compound and an aluminum-containing compound of the aluminoxane type.

Abstract: A process for the polymerization of ethylene comprises bringing ethylene or ethylene and at least one .alpha.-olefin in contact with a catalyst comprising a metallocene compound of a transition metal selected from Groups IVB, VB and VIB, an aluminoxane and a silicon compound having an Si-O-C bond for polymerization. The use of the silicon compound having an Si-O-C bond in the catalysis by a combination of a metallocene compound and an aluminoxane results in the production of ethylene polymers having a lower melt flow rate (MFR) than those produced similarly except for the silicon compound not being used.

Abstract: The process and the system are used for carrying out the quench-cooled, vapor-phase polymerization of olefin monomer in a horizontally disposed reactor vessel which comprises contacting olefin monomer, or a mixture of olefin monomers, with a polymerization catalyst system in the presence of hydrogen in the reactor vessel to form a polymer product. The improvement comprises introducing a titanium-containing catalyst component of the catalyst system into the top side of the reactor vessel at a point adjacent to the upstream end of the reactor vessel and introducing a cocatalyst plus modifer component of the catalyst system into the top side of the reactor vessel at a distance, downstream of the point of introduction of the titanium-containing catalyst component, which is equal to 25% of the inside diameter of the reactor vessel.

Abstract: The present invention relates to a gas phase process for the (co-)polymerization of alpha-olefins in a fluidized bed, by means of a catalyst system of the Ziegler-Natta type consisting of a catalyst (a) comprising magnesium, halogen and transition metal atoms and a cocatalyst (b) consisting of an organometallic compound. The catalyst system is (i) prepared in a granular form, either fixed on a granular support or converted into a prepolymer, (ii) then subjected to a treatment by a polymerization inhibiting agent in the absence of alpha-olefins, and then (iii) brought into contact with alpha-olefins under (co-)polymerization conditions in the fluidized bed, in the presence of a cocatalyst (c) consisting of an organometallic compound, identical or different from the cocatalyst (b).

Abstract: High vinyl polybutadiene rubber is utilized in a variety of applications. For instance, high vinyl polybutadiene is utilized in tire tread rubber compositions because it provides both good traction and rolling resistance. The present invention discloses a technique for synthesizing high vinyl polybutadiene utilizing a molybdenum catalyst system. This molybdenum catalyst system can be utilized in aliphatic solvents with high yields of about 75% being attained. The molybdenum catalyst systems of this invention are comprised of (a) a molybdenum containing compound which is prepared by modifying molybdenum pentachloride, molybdenum trichloride, or molybdenum tetrachloride with an alkyl carboxylic acid or an aryl carboxylic; and (b) an aluminum containing compound which is prepared by modifying a trialkyl aluminum compound with a phenol. The molecular weight of the high vinyl polybutadiene being prepared can be reduced by modifying the trialkyl aluminum compound with an allylphenol, such as 2-allylphenol.

Abstract: A method for producing an olefin polymer, which comprises polymerizing or copolymerizing olefins in the presence of a catalyst comprising:(A) a solid catalyst component obtained by thermally reacting (a.sub.1) a magnesium compound of the formula Mg(OR.sup.1).sub.n (OR.sup.2).sub.2-n wherein each of R.sup.1 and R.sup.2 which may be the same or different is an alkyl group, an aryl group or an aralkyl group, and n is 2.gtoreq.n.gtoreq.0, (a.sub.2) a titanium compound of the formula Ti(OR.sup.3).sub.4 wherein R.sup.3 is an alkyl group, an aryl group or an aralkyl group and (a.sub.3) a silicon compound of the formula Si(OR.sup.4).sub.4 wherein R.sup.4 is an alkyl group, an aryl group or an aralkyl group and contacting and treating (a) the resulting thermal reaction product with (b) a halogen-containing titanium compound and (c) an electron donative compound, and(B) an organometallic compound of a metal of Groups I-III of the Periodic Table.

Abstract: Finely divided ethane polymers are prepared using a Ziegler catalyst system consisting of (1) a titanium-containing catalyst component which has been obtained by (1.1) precipitation in an organic liquid comprising (1.1.1) a solution of titanium tetrachloride in a hydrocarbon, (1.1.2) a solution of a certain organoaluminum compound in a hydrocarbon and (1.1.3) an alpha-monoalkene, and (2) an aluminum-containing catalyst component. In this process, the component (1) used is a component where (1.

Abstract: The present invention relates to a process for the polymerisation or copolymerisation of alpha-olefins in the presence of a Ziegler-Natta catalyst system comprising on the one hand a catalyst solid comprising compounds of halogens, transition metals of Groups IV, V, VI of the Periodic Table of Elements, magnesium and optionally aluminum, free from a metal/carbon bond and on the other hand a catalyst consisting of organometallic compounds of metals of Group II or III of the said Table. This process is characterised in that before its use in polymerisation or copolymerisation, the catalyst solid is treated by water in a given quantity, this treatment making it possible to improve the conditions for obtaining polymers, particularly in a process of polymerisation or copolymerisation in the gas phase.