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| Number | Title | Issue Date |
| RE40234 | Process for producing crystalline poly-α-olefins with a monocyclopentadienyl transition metal catalyst system The invention is a catalytic process using a Group IV B transition metal component and an alumoxane component to polymerize α-olefins to produce high crystallinity and high molecular weight poly-α-olefins. ... | 04/08/2008 |
| 7238818 | Heterocyclic metallocenes and polymerization catalysts A new class of heterocyclic metallocenes, a catalytic system containing them and a process for polymerizing addition polymerizable monomers using said catalytic system are disclosed; the heterocyclic metallocenes correspond to the formula (I): YjR″... | 07/03/2007 |
| 6936393 | Catalyst for preparing polyester for toner A catalyst for preparing a polyester for a toner, comprising an inorganic tin(II) compound; a polyester resin composition comprising a polyester and the catalyst; and a toner comprising the polyester resin composition. The catalyst for preparing a polyester is suita... | 08/30/2005 |
| 6635779 | Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins A class of metallocene compounds is disclosed having general formula (I) wherein Y is a moiety of formula (II) wherein A, B, and D, same or different from each other, are selected from an element of the groups 14 to 16 of the Periodic Table of the Element... | 10/21/2003 |
| 6184316 | Catalyst and process for the syndiotactic polymerization of vinylaromatic compounds A catalyst for the polymerization of vinylaromatic monomers, and particularly styrene, with a high yield and a high syndiotacticity index, comprises the product consisting of the following two components in contact with each other: A) an η5 -c... | 02/06/2001 |
| 5932669 | Metallocenes having benzo-fused indenyl derivatives as ligands, processes for their preparation and their use as catalysts A very effective catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M1 is Zr or Hf, R1 and R2 are halogen or ... | 08/03/1999 |
| 5914375 | Catalyst composition for preparing high-syndiotactivity polystyrene from styrene or other aryl ethylene monomers and processes using the same An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'1 R'2 R'3 R'4 or TiR'1 R'2 | 06/22/1999 |
| 5830959 | Process for the production of vinylaromatic polymers with a high degree of syndiotacticity Process for the preparation of crystalline vinylaromatic polymers with a high degree of syndiotacticity which comprises polymerizing vinylaromatic monomers in the presence of a catalytic system essentially consisting of: a) a complex of titanium selected from ... | 11/03/1998 |
| 5770664 | Catalyst component for producing polyolefin, catalyst for producing polyolefin comprising the catalyst component, and process for producing polyolefin in the presence of the catalyst A catalyst component for producing polyolefin, a catalyst for producing polyolefin using the catalyst component, and a process for producing polyolefin in the presence of the catalyst. The catalyst component comprises a metallocene compound represented by... | 06/23/1998 |
| 5763542 | Process for the preparation of an olefin polymer using specific metallocenes A highly effective catalyst system for the polymerization of olefins comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## where M1 =Zr or Hf, R1 and R2 =(C1 -C... | 06/09/1998 |
| 5756608 | Polymerization process using metallocene complexes in the catalyst system A process for polymerizing C2 -C10 -alk-1-enes in the presence of a metallocene complex of the formula I ##STR1## where the substituent groups have the meanings described in the specification.... | 05/26/1998 |
| 5728784 | Process for the preparation of crystalline vinylaromatic polymers with a predominantly syndiotactic structure Process for the preparation of crystalline vinylaromatic polymers with a predominantly syndiotactic structure which comprises polymerizing vinylaromatic monomers, alone or mixed with at least one other monomer, in the presence of a catalytic system essent... | 03/17/1998 |
| 5672668 | Process for the preparation of polyolefins A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula Ra --CH.dbd.CH--Rb, in which Ra and Rb are identical or different and are a hydrogen atom or a... | 09/30/1997 |
| 5644009 | Catalyst composition for preparing high syndiotacticity polystyrene from styrene of other arylethylene monomers and processes using the same An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'1 R'2 R'3 R'4 or TiR'1 R'2 | 07/01/1997 |
| 5637744 | Bis fluorenyl metallocenes and use thereof Group IVB metal metallocenes of bis(1-methyl fluorenyl) diphenyl silane and bis(1-methyl fluorenyl) dimethyl tin are disclosed, plus their use in the production of polyolefins, including isotactic polypropylene.... | 06/10/1997 |
| 5631335 | Process of polymerizing olefins using diphenylsilyl or dimethyl tin bridged 1-methyl fluorenyl metallocenes Group IVB metal metallocenes of bis(1-methyl fluorenyl) diphenyl silane and bis(1-methyl fluorenyl) dimethyl tin are disclosed, plus their use in the production of polyolefins, including isotactic polypropylene.... | 05/20/1997 |
| 5623034 | Process for producing styrenic polymer There is disclosed a process for producing a syndiotactic polystyrene (SPS) which comprises polymerizing a styrenic monomer having a content of indene-based compounds of at most 50 ppm by bringing a polymerization catalyst into contact with the above styr... | 04/22/1997 |
| 5616663 | Transition metal compound, olefin polymerization catalyst component comprising the transition metal compound, olefin polymerization catalyst comprising the olefin polymerization catalyst component, and process for olefin polymerization Disclosed is a novel transition metal compound represented by the following formula: ##STR1## wherein M is a transition metal, X is halogen or the like, R1 is a hydrocarbon group or the like, R2 is an aryl group substituted with... | 04/01/1997 |
| 5612428 | Process for preparing olefin polymer with catalyst containing metallocene The invention relates to a metallocene compound of the formula I ##STR1## where the two indenyl ligands have substitution patterns different from one another. The metallocene compound can be used as catalyst component for olefin polymerization.... | 03/18/1997 |
| 5580939 | Process and catalyst for polyolefin density and molecular weight control Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.... | 12/03/1996 |
| 5576260 | Metallocene-based catalysts The invention relates to a metallocene compound of the formula I ##STR1## where the two indenyl ligands have substitution patterns different from one another. The metallocene compound can be used as catalyst component for olefin polymerization.... | 11/19/1996 |
| 5532396 | Metallocene compound The invention relates to a metallocene compound of the formula I ##STR1## where the two indenyl ligands have substitution patterns different from one another. The metallocene compound can be used as catalyst component for olefin polymerization.... | 07/02/1996 |
| 5527868 | Catalyst systems for the polymerization of C2 -C10 -alk-1-enes Catalyst systems for the polymerization of C2 -C10 -alk-1-enes contain, as active components, a) a metallocene complex of the general formula I ##STR1## where M is a metal of subgroup III, IV or V of the Periodic Table of Elemen... | 06/18/1996 |
| 5468707 | Coordination catalyst systems The invention relates to the use of cyclic organometallic compounds as components in coordination catalyst systems, to corresponding coordination catalyst systems and also to processes for the preparation of polymers by coordination polymerization and of ... | 11/21/1995 |
| 5461128 | Process for producing a styrenic polymer There are disclosed a catalyst which comprises (A) a titanium compound having one π electron-based ligand (e.g. pentamethylcyclopentadienyl group) or two same π electron-based lignads and (B) an ionic compound comprising a non-coordinate anion and a cat... | 10/24/1995 |
| 5438093 | Modified polycycloolefins Solution and RIM polymerization of cycloolefins containing at least one norbornene moiety is carried out in the presence of a methathesis catalyst system and an activator, particularly a chlorosilane activator, to obtain faster reaction with higher conver... | 08/01/1995 |
| 5416178 | Process for the preparation of 1-olefin polymers In the case of Ziegler catalysts based on a metallocene as the transition metal component and an aluminoxane as the activator, preactivation of the metallocene with the aluminoxane results in a considerable increase in the activity of the catalyst system.... | 05/16/1995 |
| 5326837 | Catalyst systems for syndiospecific polymerization of styrenes Syndiotactic polystyrene is produced in the presence of a catalyst comprising: (i) trimethylaluminum, (ii) at least one of the organotin compounds with general formulae: R1 R2 R3 Sn--O--SnR4 R5 R6 or... | 07/05/1994 |
| 5324800 | Process and catalyst for polyolefin density and molecular weight control Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.... | 06/28/1994 |
| 5258475 | Catalyst systems for polymerization and copolymerization of olefins The catalyst systems of this invention consist of catalyst precursors which are metallocene derivatives and cocatalysts. The cocatalysts comprise mixtures of: (i) trimethylaluminum, and (ii) at least one organotin compound selected from the group consisti... | 11/02/1993 |
| 5248745 | Copolymerization of dicyclopentadiene with norbornene derivatives A process for the production of thermoset copolymers having tailored product properties such as high glass transition temperature and/or increased cross-linking, the process comprising contacting a comonomer mixture with a methathesis catalyst system obta... | 09/28/1993 |
| 5227440 | Mono-Cp heteroatom containing Group IVB transition metal complexes with MAO: supported catalysts for olefin polymerization The invention is a supported catalyst system including an inert support material, a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.... | 07/13/1993 |
| 5225500 | Process and catalyst for producing syndiotactic polyolefins Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise an unbalanced met... | 07/06/1993 |
| 5132381 | Process for the preparation of a syndiotactic polyolefin A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula Ra --CH.dbd.CH--Rb in the presence of a catalyst consisting of a metallocene of the formula I ##STR1## and a... | 07/21/1992 |
| 5128295 | Catalyst and process for the polymerization and copolymerization of alpha-olefins Alpha-olefin polymers and copolymers are prepared by polymerizing the monomers in the presence of a catalyst obtained by bringing into contact: a) a compound definable by the formula: ##STR1## wherein: M is represents a metal of group 4ଲ of the per... | 07/07/1992 |
| 5120806 | Mixed activators for stabilized metathesis catalysts A metathesis catalyst activator composition consisting essentially of an alkoxyalkylaluminum halide and a tin compound in a molar ratio of about 0.15 to 2 moles of the alkoxyalkylaluminum halide per mole of tin compound.... | 06/09/1992 |
| 5109073 | Process for the preparation of polymer blends A process for preparing a blend of a norbornene polymer and a vinyl polymer, the process comprising (a) injecting into a mold a reaction mixture comprising from about 30 to about 70 weight percent, based on the total monomer weight, of at least one substi... | 04/28/1992 |
| 5093441 | Polymerization of norbornene derivatives A process for the production of thermoset polymers comprising contacting at least one monomer of the formulae: ##STR1## with a metathesis catalyst system which comprises a tungsten catalyst and a tin or silicon hydride cocatalyst.... | 03/03/1992 |
| 5086134 | Process for the preparation of an ethylene/propylene copolymer The invention relates to a process for the preparation of a predominantly crystalline ethylene/propylene copolymer having less than 15 mol % of propylene units, which can be carried out in liquid propylene as the suspending agent, if metallocene catalyst ... | 02/04/1992 |
| 5026798 | Process for producing crystalline poly--olefins with a monocyclopentadienyl transition metal catalyst system The invention is a catalytic process using a Group IV B transition metal component and an alumoxane component to polymerize -olefins to produce high crystallinity and high molecular weight poly--olefins.... | 06/25/1991 |
