Abstract: The invention is directed to olefin polymerization processes using bridged hafnocene catalyst complexes comprising highly substituted noncoordinating anions that are surprisingly stable under high temperature olefin polymerization processes such that olefin copolymers having significant amount of incorporated comonomer can be prepared with high molecular weights. More specifically, the invention is a polymerization process for ethylene copolymers having a melt index of about 0.87 to about 0.930 comprising contacting, under homogeneous polymerization conditions at a reaction temperature at or above 140° C. to 225° C.
Type:
Grant
Filed:
March 3, 1999
Date of Patent:
September 18, 2001
Assignee:
ExxonMobil Chemical Patents Inc.
Inventors:
Donna J. Crowther, Bernard J. Folie, John F. Walzer, Jr., Rinaldo S. Schiffino
Abstract: Components of bimetallic catalysts for the polymerization of olefins comprising a compound of a transition metal M selected from Ti, V, Zr and Hf containing at least one M-&pgr; bond, a compound of Ti or V not containing metal-&pgr; bonds and a support comprising a magnesium halide. The catalysts obtained from the components of the invention are particularly suitable for gas-phase polymerization processes.
Type:
Grant
Filed:
June 27, 1997
Date of Patent:
September 18, 2001
Assignee:
Montell Technology Company
Inventors:
Mario Sacchetti, Stefano Pasquali, Gabriele Govoni
Abstract: Components of bimetallic catalysts for the polymerization of olefins comprising a compound of a transition metal M selected from Ti, V, Zr and Hf containing at least one M-&pgr;bond, a compound of Ti or V not containing metal-&pgr; bonds and a support comprising a magnesium halide. The catalysts obtained from the components of the invention are particularly suitable for gas-phase polymerization processes.
Type:
Application
Filed:
June 27, 1997
Publication date:
August 30, 2001
Inventors:
MARIO SACCHETTI, STEFANO PASQUALI, GABRIELE GOVONI
Abstract: The invention relates to solid catalyst components for the polymerization of olefins CH2═CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Ti, Mg, halogen and an electron donor compound selected from cyanoesters of formula (I):
wherein R1 is a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, alkylcycloalkyl, aryl, arylalkyl or alkylaryl group; n is 0, 1, 2 or 3; R2, R3, R4 and R5 are independently selected from hydrogen or C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, alkylcycloalkyl, aryl, arylalkyl or alkylaryl groups; two or more of R2 and R3, and R4 and R5, can be joined to form a cycle. Said catalyst components when used in the polymerization of olefins are characterized by an excellent response to hydrogen and capability to produce polymers with broad Molecular Weight Distribution.
Type:
Grant
Filed:
September 18, 2000
Date of Patent:
May 29, 2001
Assignee:
Montell Technology Company B.V.
Inventors:
Giampiero Morini, Yuri V. Gulevich, Giulio Balbontin
Abstract: The invention provides a process for preparing a solid titanium catalyst component for use in the preparation of an olefin polymerization catalyst, which comprises:
(1) a step wherein a suspension is prepared which contains a solid material prepared by contacting a magnesium compound with a first titanium compound and having a polybasic carboxylic acid ester supported thereon;
(2) a step wherein the solid material is separated from the suspension; and
(3) a step wherein the solid material is contacted with a second titanium compound under heating;
wherein while the solid material is separated from the suspension in the step (2) and the solid material is supplied to the step (3), the solid material is maintained at a temperature in the range of 70-130° C.
Abstract: Process for the gas-phase polymerization of olefins of the formula CH2═CHR where R is hydrogen or an alkyl or aryl radical with 1 to 8 carbon atoms carried out in one or more reactors having a fluidized or mechanically agitated bed, using a catalyst obtained by reaction of a titanium halide or haloalcoholate and optionally an electron-donor compound supported on an active Mg-dihalide with an Al-trialkyl compound and optionally an electron-donor compound, comprising the steps of:
a) contacting the catalyst components in the absence of polymerizable olefin or optionally in the presence of said olefin in an amount to from up to 3 g per g of solid catalyst component;
b) prepolymerizing propylene or mixtures of propylene with ethylene or an alpha-olefin to form a propylene polymer having an insolubility in xylene of at least 60% by weight, in an amount of from 5 g of polymer per g of solid catalyst component to 10% by weight of the final catalyst yield; and
c) polymerizing one or more CH2═CHR olefins
Type:
Grant
Filed:
June 7, 1995
Date of Patent:
May 8, 2001
Assignee:
Montell Technology Company BV
Inventors:
Massimo Covezzi, Paolo Galli, Gabriele Govoni, Roberto Rinaldi
Abstract: A novel soluble composition containing magnesium, titanium, a halogen and a carboxylic acid ester has been invented. The composition has mainly the composition according to Formula (I):
(MgX32)xTiX44(R(COOR′)n)y (I)
wherein X3 is a halogen, X4 is a halogen, R(COOR′)n is a carboxylic acid higher alkyl ester containing at least 8·n carbon atoms, wherein R is an n-valent substituted or unsubstituted C1-C34 hydrocarbon group, R′ is a C1-C20 alkyl group, and n is an integer from 1 to 4, x is between 0.5 and 4.0, and y is between 0.8/n and 2.4/n.
Type:
Grant
Filed:
November 30, 1998
Date of Patent:
March 13, 2001
Assignee:
Borealis Technology Oy
Inventors:
Thomas Garoff, Timo Leinonen, Sirpa Ala-Huikku
Abstract: An olefin polymerization process is described. The process comprises polymerizing an olefin in the presence of a supported single-site catalyst, an optional activator, and a fatty amine. The fatty amine is added at a concentration in the range from about 10 to about 75 weight percent based on the weight of the supported catalyst. The fatty amine helps to reduce fouling and sheeting during the polymerization process and enhances catalyst activity.
Type:
Grant
Filed:
April 29, 1999
Date of Patent:
March 13, 2001
Assignee:
Equistar Chemicals, L.P.
Inventors:
Bradley P. Etherton, Gregory G. Hlatky, James H. Meas, Jr.
Abstract: The present invention relates to a solid catalyst component for &agr;-olefin polymerization having a narrow particle size distribution of not less than 6.0 in terms of the value of N in a Rosin-Rammler function of particle size distribution and giving a catalytic activity of not less than 10,000 ((g-polymer produced/g-solid catalyst component)/hour) in polymerization. The catalyst component is obtained by a process which comprises reducing a titanium compound with an organomagnesium compound in the presence of an organosilicon compound and an ester to obtain a solid product, then treating the solid product with: (a) a mixture of titanium tetrachloride and an ether, (b) an organic acid halide, and (c) a mixture of titanium tetrachloride and an ether optionally containing an ester.
Abstract: A new synthesis of a Ziegler-Natta catalyst uses a multi-step preparation which includes treating a soluble magnesium compound with successively stronger chlorinating-titanating reagents. The catalyst may be used in polymerization of olefins, particularly ethylene, to produce a polymer with low amount of fines, large average fluff particle size and narrow molecular weight distribution. The catalyst has high activity and good hydrogen response.
Type:
Grant
Filed:
January 28, 1997
Date of Patent:
January 16, 2001
Assignee:
Fina Technology, Inc.
Inventors:
Hong Chen, Tim J. Coffy, Edwar S. Shamshoum