1593 results about "Olefin polymerization" patented technology

Copolymers, especially multi-block copolymer containing therein two or more segments or blocks differing in chemical or physical properties, are prepared by polymerizing propylene, 4-methyl-1-pentene, or other C_4-8α-olefin and one or more copolymerizable comonomers, especially ethylene in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

This invention relates to a catalyst system for the production of polyolefins comprising:

(A) a Group IV B transition metal component represented by one of the two general formulae

wherein

(C₅H_5-y-xR_x) is a cylopentadienyl ring

(JR′_z-l-y) is a heteroatom ligand in which J is an element with a coordination number of three from Group V-A or an element with a coordination number of two rom Group VI-A of the Periodic Table of Elements,

each Q is independently, hydride, C₁—C₂₀ hydrocarbyl radicals, substituted hydrocarbyl radials wherein one or more hydrogen atoms is replaced by an electron withdrawing group, or C₁—C₂₀ hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the group consisting of germanium and silicon, provided that Q is not a substituted or unsubstituted cyclopentadienyl ring, or both Q together may be an alkylidene, olefin, acetylene or a cyclometallated hydrocarbyl;

“y” is 0 or 1; when “y” is 1, T is a covalent bridging group containing a Group IV-A or V-A element;

L is a neutral Lewis base; and “w” is a number from 0 to 3;

(B) an activator compound comprising (1) a cation; and (2) a compatible noncoordinating anion.

The catalyst for polymerization and copolymerization of olefine is one novel kind of group III to group XIII transition metal complex of tridentate ligand.

The invention discloses an application of load non- metallocene catalyst in the slurry process for vinyl polymerying, the load non- metallocene catalyst and catalyst promoter forming the catalytic system, the alkene polymerization comprising: vinyl homopolymerization, combined polymerization of vinyl with propylene, butylenes, hexane, octane or norbornene; the catalyst carrier being chosen from: inorganic oxide of metallic oxide from IIA, IIIA, IVA, and IVB groups, or oxided mixture and mixing oxide; the catalyst promoter being chosen from: methylaluoxane, ethylaluoxane, isobutylaluoxane, trimethylaluminum,triethylaluminum,triisobutylaluminum,methylaluoxane-trimethylaluminum or methylaluoxane-triethylaluminum; the mole proportion between the catalyst promoter and catalyst being Al/Ti= 1:1-500. The inventioin is characterized by the less methylaluoxane consumption, stable reaction, easy-to-control polymerization temperature and non still-sticking phenomenon. The produced polyolefine possesses perfect granual shape, and the maximum polymer clamp density can reach 0.385 g/ml.

The invention relates to a new catalyst for single active central Ziegler-Natta alkene polymerization. Said catalyst takes salicylal containing dentate or substituted salicylal derivatives as electrons, and is prepared by adding pretreated carrier, metallic compound and electrons into magnesium compound/ tetrahydrofuran solution. The catalyst can produce ethane homopolymer and copolymer with narrow molecular weight distribution (1.6-3.8) and even comonomer distribution, with high activity and under action of adjuvant catalyst of alkyl aluminium and alkyl aluminoxanes. The ethane polymerization, homopolymerization or combined polymerization of ethane and 1- olefin, ring olefin and polar monomer through slurry method or gas phase method by using said catalyst can be realized.

This invention relates to a polymer of one or more C3 to C40 olefins, optionally one or more diolefins, and less than 15 mole % of ethylene, and polymerization processes for producing the same.

The invention relates to spherical carriers for an olefin polymerization catalyst and a preparation method. Each spherical carrier comprises reaction products of the following components: (1) magnesium halide which is shown as the general formula MgX2, (2) alcohol compounds which are shown as the general formula ROH, and (3) ethylene oxide compounds which are shown as the general formula (I), wherein in the general formula (I), R2 and R3 are alkyls with a C1-C5 straight chain or branched chain; and hydrogen on the alkyls can be randomly substituted by a halogen atom. The spherical carriers have good particle shapes, adjustable particle sizes and narrow particle size distribution, and the preparation method is simple.

The invention discloses an alpha-nickel diimine compound olefin polymerization catalyst and a preparation method thereof, and a method for preparing branched polyethylene. Structural formulas of the alpha-nickel diimine compound olefin polymerization catalyst are shown as a formula (I) and a formula (II), and the preparation method of the alpha-nickel diimine compound olefin polymerization catalyst is simple and low in cost, and can catalyze ethylene polymerization with high activity at a temperature of more than or equal to 80 DEG C to obtain high molecular weight polyethylene. The polyethylene prepared by catalyzing of the alpha-nickel diimine compound olefin polymerization catalyst has high molecular weight, and can prepare molecular weight which reaches more than 10<2>*kg/mol in the temperature range of between 0 and 80 DEG C.

This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention encompasses a catalyst composition comprising the contact product of a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound. The new resins were characterized by useful properties in impact, tear, adhesion, sealing, extruder motor loads and pressures at comparable melt index values, and neck-in and draw-down.

The invention discloses an ethylidene acenaphthene (alpha-diimine) nickel olefin catalyst, and a preparation method and application thereof. The structural formula of the ethylidene acenaphthene (alpha-diimine) nickel olefin catalyst is disclosed as Formula (I). The ethylidene acenaphthene (alpha-diimine) nickel olefin polymerization catalyst disclosed as Formula (I) has the advantages of high activity and high stability, and can catalyze the preparation of high-molecular-weight hyperbranched polyethylene from ethylene at high activity at the temperature of higher than or equal to 60 DEG C. When being used for ethylene polymerization as a catalyst, the thylidene acenaphthene (alpha-diimine) nickel olefin polymerization catalyst has high activity only when the aluminum-nickel ratio is 100. In addition, the preparation method of the olefin polymerization catalyst disclosed by the invention has the advantages of simple technique, short synthetic route, low cost and high yield, and can easily implement industrialization.

A semiconducting composition comprising (i) an olefinic polymer and (ii) about 25 to about 45 percent by weight, based on the weight of the composition, of a carbon black having the following properties: (a) a particle size of at least about 29 nanometers; (b) a tint strength of less than about 100 percent; (c) a loss of volatiles at 950 degrees C in a nitrogen atmosphere of less than about 1 weight percent based on the weight of the carbon black; (d) a DBP oil absorption of about 80 to about 300 cubic centimeters per 100 grams; (e) a nitrogen surface adsorption area of about 30 to about 300 square meters per gram or an iodine adsorption number of about 30 to about 300 grams per kilogram; (f) a CTAB surface area of about 30 to about 150 square meters per gram; and (g) a ratio of property (e) to property (f) of greater than about 1.1.

A catalyst system for the polymerization of olefins comprising the product obtained by contacting:

• (A) a metallocene complex;
• (B) an organometallic aluminium compound of formula (II):

Al[CH₂—C(Ar)R⁴R⁵]_xH_y  (II)

wherein Ar is a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms; R⁴ is a linear or branched, saturated or unsaturated, C₁–C₁₀ alkyl, C₆–C₂₀ aryl, C₇–C₂₀ arylalkyl or C₇–C₂₀ alkylaryl; R⁵ is hydrogen or a linear or branched, saturated or unsaturated, C₁–C₁₀ alkyl, C₆–C₂₀ aryl, C₇–C₂₀ arylalkyl or C₇–C₁₃ alkylaryl group;

x=2 or 3; y=3-x; and

water;

the molar ratio (B)/(C) being between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.

This invention provides a catalys conponent and catalyst. Said catalyst comprises titanium, magnesium and at least three electron donor compounds a, b and c, in which is selected from mono-aliphatic-carboxylate or mono-aromatic-carboxylate compounds, b is selected from a special diatomic alkoxide compound, and c is selected from binary binary-aliphatic-carboxylate or binary-aromatic-carboxylate or b is ether compound. Advantages: high polymerization activity and stereospecificity when used for olefin polymerization, in particular for propylene polymerization, wide molecular weight distribution of obtained polymer and good shape of polymer granulars.

The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a selectivity greater than 30%.

The invention provides a method for preparing spherical alkoxyl magnesium particles with excellent properties. In the method, magnesium, alcohol and a halogenating agent are reacted at a reflux temperature, so that the alkoxyl magnesium particles are obtained. The alkoxyl magnesium particles have the advantages of higher bulk density, good particle shape and particular suitability for serving as a catalyst carrier of an olefin polymerization reaction.

The invention provides a supported metallocene catalyst, which comprises a carrier, and alkyl aluminoxane and a metallocene compound which are supported on the carrier, wherein the metallocene compound has a structure shown as a formula 1. The invention also provides a method for preparing the supported metallocene catalyst, a method for preparing an olefin polymer by using the catalyst, and the olefin polymer prepared by the method for preparing the olefin polymer. In the olefin polymerization process, the supported metallocene catalyst can reduce the using amount of the alkyl aluminoxane so as to reduce the preparation cost of the olefin polymer; the high molecular weight polyethylene prepared by using the catalyst has a good shape and high bulk density; and the catalyst can be applied to gas-phase polymerization and slurry polymerization processes. The formula 1 is shown as the specifications.

Disclosed is a process for producing branched polymers including at least 50 mol % C₃–C₄₀ olefins. The process may include: (1) feeding a first catalyst, an activator, and one or more C₂–C₄₀ olefins into a first reaction zone at a temperature of greater than 70° C. and a residence time of 120 minutes or less to produce a product; (2) feeding the product a second catalyst, and an activator into a second reaction zone at a temperature of greater than 70° C., and a residence time of 120 minutes or less. One of the catalysts should be chosen to produce a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or less. The other catalyst should be chosen to producing a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or more.

Embodiments disclosed herein generally relate to olefin polymerization catalysts, and more specifically to chromium-based catalysts and methods of use of chromium-based catalysts for the production of polyolefins, and even more specifically to methods for controlling or tailoring the flow index response of chromium-based catalysts through the controlled addition of a reducing agent to the catalysts under controlled mixing conditions.

A method for olefin polymerization is provided. A feed stream comprising more than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water is passed through a first packed bed to selectively remove at least a portion of the oxygen. The feed stream is then passed through a second packed bed to selectively remove at least a portion of the water, providing a purified feed stream comprising less than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water. Both the first and second packed beds operate at a temperature of from about 0° C. to about 50° C. The purified feed stream is then passed to a polymerization reactor.

A hot melt adhesive composition that includes a non functionalized amorphous poly alpha olefin polymer, a second polymer selected from the group including polypropylene homopolymers, polypropylene copolymers and combinations there of, a functionalized wax and a second wax.

This invention relates to higher olefin vinyl terminated polymers having an Mn of at least 200 g/mol (measured by ¹H NMR) including of one or more C₄ to C₄₀ higher olefin derived units, where the higher olefin vinyl terminated polymer comprises substantially no propylene derived units; and wherein the higher olefin polymer has at least 5% allyl chain ends and processes for the production thereof. These vinyl terminated higher olefin polymers may optionally include ethylene derived units.

The present invention provides a propylene/1-butene random copolymer (PBR) having excellent flexibility, impact resistance, heat resistance and low-temperature heat-seal properties, a polypropylene composition containg the copolymer, a sheet, film or stretched film comprising the composition and a composite film having a layer of the composition. The propylene/1-butene random copolymer contains 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution (Mw/Mn) of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point (Tm) of from 40 to 120° C., and satisfies the following relation

146 exp(−0.022M)≧Tm≧125 exp(−0.032M)

wherein Tm represents a melting point and M (mol %) represents a content of 1-butene constituent units.

The invention, further, provides a transition metal compound useful as an olefin polymerization catalyst and an olefin polymerization catalyst containing the transition metal compound. The transition metal compound is represented by the following formula (2a):

wherein each of R¹ and R³ is hydrogen, R² and R⁴ are selected from a hydrocarbon group and silicon-containing group, R⁵ to R¹³ are selected from hydrogen, a hydrocarbon group and silicon-containing group, and adjacent substituent groups R⁵ to R¹² may be linked to form a ring. R¹⁴ is an aryl group, and R¹³ and R¹⁴ may be linked to form a ring. M is a Group 4 transition metal, Y is a carbon atom, Q is halogen, etc, and j is an integer of 1 to 4.

A process for the preparation of a catalyst system includes the steps of combining a support material with a first composition which includes at least one aluminoxane in a first solvent to provide an aluminoxane loaded support; and, contacting the aluminoxane loaded support with a second composition which includes at least one metallocene compound, a second solvent, and a cocatalyst, wherein the cocatalyst includes a second portion of the at least one aluminoxane alone or in combination with an ionic compound and/or a Lewis acid.

A catalyst for olefin polymerization, comprising:

• • (A-1) a bridged metallocene compound represented by the following Formula [1-1], and (b) at least one compound selected from: (b-1) an organoaluminum oxy compound, (b-2) a compound which forms an ion pair, and (b-3) an organoaluminum compound:

wherein in Formula [1-1], R¹, R², R³, R⁴, R⁵, R⁸, R⁹, and R¹² are each selected from a hydrogen, a hydrocarbon group and a silicon-containing group; the four groups of R⁶, R⁷, R¹⁰, and R¹¹ are not hydrogen atoms, and are each selected from a hydrocarbon group or a silicon-containing group; R¹³ and R¹⁴ are each a hydrocarbon group or the like, excluding a hydrogen atom and a methyl group; M is Ti, Zr or the like; Y is carbon or the like; Q is a halogen or the like; and j is an integer from 1

The invention refers to a kind of new diatomic alcohol ester, whose general equation is as the figure (1), its preparation method and its application to producing the catalyzer in the olefinic polymerization. The R1 and R2 chosen from the straight chain or branched chain alkyl, cycloalkyl, aryl, alkaryl, aralkyl, olefin or condensed nucleus aryl of C1 to C20 don't matter, whether they are same or different. So do the R3 to R6 and R1 to R4 and they are one of the hydrogen, halogen, the straight chain or branched chain alkyl, cycloalkyl, aryl, alkaryl, aralkyl, olefin or condensed nucleus aryl of C1 to C20. The R1 and R2 are selected from the hydrogen, halogen, the straight chain or branched chain alkyl, cycloalkyl, aryl, alkaryl, aralkyl, olefin or condensed nucleus aryl of C1 to C20, but the R1, R2, R3,R4, R5 and R6 can't be hydrogen or halogen at the same time and can form cycles between them.

Non-ionic late transition metal chelates of salicylaldimine and pyrrolaldimine can be tethered to an inert support by a covalent bond to provide a catalyst useful in slurry and gas phase polymerization of olefins.

Thermoplastic olefinic compositions comprising (a) at least one ethylene/α-olefin polymer having a PRR between 8 and 70 and (b) at least one polypropylene polymer and an (a)/(b) weight ratio of greater than 50/less than 50 to 90/10. The compositions are used in extrusion, calendering, blow molding, foaming and thermoforming processes to make a variety of articles, such as automotive instrument panel skins.

An aluminum activator and catalyst system for olefin polymerization is provided. In one aspect, the catalyst system comprises a polymerization catalyst and an activator comprising two or more heterocyclic nitrogen-containing ligands coordinated to a Group 13 atom. Preferably, the activator is a reaction product of one or more Group 13 atom-containing compounds and one or more heterocyclic nitrogen-containing compounds.

A process for the production of high octane number gasoline from light refinery olefins, typically from the catalytic cracking unit, and benzene-containing aromatic streams such as reformate. A portion of the light olefins including ethylene and propylene is polymerized to form a gasoline boiling range product and another portion is used to alkylate the light aromatic stream. The alkylation step may be carried out in successive stages with an initial low temperature stage using a catalyst comprising an MWW zeolite followed by a higher temperature stage using a catalyst comprising an intermediate pore size zeolite such as ZSM-5. Using this staged approach, the alkylation may be carried out in the vapor phase. Alternatively, the alkylation may be carried out in the liquid phase using the heavier olefins (propylene, butene) dissolved into the aromatic stream by selective countercurrent extraction; a separate alkylation step using the ethylene not taken up in the extraction is carried out at a higher temperature.

A composite material which is suitable as a wall covering comprises a substrate layer that is permeable to water vapor, such as a nonwoven web material made from cellulose and synthetic fibers, and that is coated, preferably extrusion coated, with a plastics material. In one embodiment the plastics material comprises an olefin polymer, olefin copolymer or blend of olefin (co)polymer and a particulate filler, e.g. calcium carbonate or a mixture thereof with titanium dioxide. In another embodiment the plastics material is a microporous breathable polymer film or a monolithic breathable polymer film.