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8088868 Polymers functionalized with protected oxime compounds  
A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing conjugated diene monomer by employing a lanthanide-based catalyst to form a reactive polymer,...
8084565 Catalyst for polymerization of conjugated diene and method of polymerizing conjugated diene using the catalyst, rubber composition for tires, and rubber composition for golf balls  
A catalyst for polymerization of conjugated diene is provided, which facilitates manufacture of a conjugated diene polymer with a high 1,4-cis structure content, leaves less aluminum residue on...
7956141 Metal complex containing tridentate ligand, and polymerization catalyst comprising the same  
The present invention provides 1) a complex comprising a mono-anionictridentate ligand, represented by the following general formula (I); 2) a polymerization catalyst composition, comprising the...
7956146 Tire with tread of polybutadiene rubber  
Pneumatic rubber tire with an outer, circumferential tread comprised of specialized cis 1,4-polybutadiene rubber based silica/carbon black reinforced rubber composition.
7919571 Polybutadiene as well as rubber composition using the same and tire  
This invention provides a polybutadiene capable of improving wear resistance and resistance to crack growth in a rubber composition and a tire, wherein values of e, f and g derived from the...
7799725 Catalyst for polymerization of conjugated diene and method of polymerization conjugated diene using the catalyst, rubber composition for tires, and rubber composition for golf balls  
A catalyst for polymerization of conjugated diene comprises (A) an yttrium compound; (B) an ionic compound including a non-coordinate anion and a cation; and (C) an organometallic compound...
7741418 Process for producing polydienes  
A process for preparing a polydiene, the process comprising the step of polymerizing conjugated diene monomer in the presence of a dihydrocarbyl ether, where said step of polymerizing employs a...
7691957 Butadiene-based polymer and method of producing the same as well as rubber composition and tire using the same  
This invention is concerned with a butadiene-based polymer having a high cis-1,4 bond content, a low vinyl bond content and a molecular weight distribution of a specified range, and more...
7625979 Process for preparing block copolymer and resulting composition  
Lithium-terminated polymers of one or more conjugated dienes and of one or more mono alkenyl arenes are coupled by reaction with an alkoxy silane coupling agent having the formula...
7585805 Nickel-based catalyst composition  
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound,...
7534835 Golf ball  
A golf ball is composed at least in part of a material molded under heat from a rubber composition which includes: (a) a base rubber composed primarily of a mixture of at least 60 wt % of a...
7511108 Pneumatic tire  
The invention relates to a pneumatic tire having excellent mechanical properties by using a rubber composition containing a polybutadiene rubber having a high cis-1,4 bond content, a low vinyl bond...
7485765 Process for obtaining a butadiene homopolymer in the presence of monoolefin(s) with 4 carbon atoms  
A process is described for obtaining a 1,3-butadiene homopolymer by the reaction of a catalytic system in the presence of 1,3-butadiene and one or more monoolefin(s) with 4 carbon atoms. This...
7411027 Modified diene-α-olefin copolymer and method for producing same  
A modified diene-α-olefin copolymer which is represented by the formula (1) below and has H2C═C(R5)—COO— in at least a part of the ends. wherein R1 and R2 independently represent a hydroxyl group ...
7396889 Method for preparing a diene elastomer  
A method for preparing a diene elastomer, such as a butadiene homopolymer or copolymer, in particular, a polybutadiene, with a high level of cis-1,4 linkages that has both a Mooney viscosity...
7351776 Bulk polymerization process  
A method for the continuous production of polydienes, the method comprising the steps of (a) charging a mixture of one or more monomer, catalyst system, and less than 50% weight percent organic...
7294680 Method of producing conjugated diene polymers with narrow molecular weight distribution and polymer produced  
Conjugated diene polymers having good wear resistance, mechanical properties, storage stability, processability and a reduced cold flow are produced by polymerizing a conjugated diene compound with...
7288611 Methods for preparing a rare-earth cis-1,4-polybutadiene rubber with a controlled molecular weight distribution  
Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadiene monomers using a rare-earth catalyst system...
7148299 Polymerization catalyst  
The present invention relates to a catalyst for polymerization of a conjugated diene or the like, which is composed of a metallocene-type cation complex of a gadolinium compound. Examples of such...
7112632 Process for the preparation of low branch content polybutadiene  
A process for the preparation of low branch content polybutadiene comprising: (a) a first butadiene polymerisation stage;(b) treatment of the polymer solution obtained upon completion of stage (a)...
7094849 Bulk polymerization process for producing polydienes  
A method of producing cis-1,4-polydienes, the method comprising the step of contacting conjugated diene monomer with a lanthanide-based catalyst system in the presence of less than 20% by weight of...
7081504 Synthesis of 1,4-polybutadiene  
This invention is based upon the unexpected discovery that alkylated diphenylamines can be used in conjunction with nickel based catalyst systems which contain (a) an organonickel compound, (b) an...
6908975 Method for preparing high 1,4-cis polybutadiene having controlled cold flow  
The present invention relates to a method for preparing a high 1,4-cis polybutadiene having a controlled cold flow and, more particularly, to a novel method for preparing a high 1,4-cis...
6897270 Continuous process for the production of conjugated diene polymers having narrow molecular weight distribution and products therefrom  
A continuous process for producing conjugated diene polymers comprising the steps of contacting, within an hydrocarbon solvent and within a continuous reactor, conjugated diene monomer and a...
6887956 Catalyst system for high-cis polybutadiene  
A catalyst system suitable for use in the production of high cis polybutadiene is disclosed. The catalyst system includes a cobalt salt of the formulaCoAx?, where A is a monovalent or divalent...
6875827 Hydrogenated polymer and process for producing the same  
The present invention relates to a hydrogenated polymer which is a hydrogenation product of a conjugated diene polymer having an average vinyl bond content of 20% by weight or more and less than...
6727330 Termination and reduced gel in high cis polybutadiene  
The present invention is directed to a process for forming a high-cis polydiene. The process includes catalyzing a diene polymerization, and terminating the polymerization with a termination...
6683140 Catalyst for polymerization  
A catalyst in a solid state for polymerization of a conjugated diene or copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises a metallocene-type cation complex of a...
6664347 Polybutadiene and process for producing the same  
Modified polybutadiene having a high-cis and low-trans structure with a moderate 1,2-structure content and exhibiting improved characteristics such as cold flow properties, which is obtained by...
6653430 Butadiene polymers and process for producing conjugated diene polymers  
A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on...
6627713 Gas phase polymerization process  
A process for producing polymer in a gas phase reactor by introducing a stream of monomer and gas into a polymerization zone while providing at least one liquid component in the polymerization zone.
6596825 Low gel high cis polydiene  
The present invention is directed to a process for forming a high-cis polydiene. The process includes catalyzing a diene polymerization, and terminating the polymerization with an amine-water...
6566468 Nitroxyl derivatives with glycidyl or alkylcarbonyl groups as initiators for radical polymerization  
Glycidyl and alkylcarbonyl functional nitroxide radical polymerization initiator compounds of formula (Ia) or (Ib), where R1, R2 and A are as defined within,R3 is a radical of formula (II) whereX...
6562917 Method for preparing polybutadiene having controlled molecular weight and high 1,4-cis content  
A method for preparing polybutadiene having controlled molecular weight and high 1,4-cis content over 95% in the presence of a diethylzinc compound as a cocatalyst (i.e., alkylating agent) and...
6521726 Method of producing a polymer  
A polymer of ethylenically unsaturated monomer, for example, 1,3-butadiene, having a desired molecular weight and distribution thereof is produced, with a high stability, by preparing a solution of...
6506865 Monomeric neodymium carboxylate and its use in polymerization of conjugated diene  
The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does...
6451934 Process for preparation of high 1,4-CIS polybutadiene  
This invention relates to a process for preparation of high 1,4-cis polybutadiene and more particularly, to the process for preparing polybutadiene by polymerizing 1,3-butadiene monomer in the...
6441107 Molecular weight control of gas phase polymerized polybutadiene when using a rare earth catalyst  
A process for controlling the molecular weight (Mw) and molecular weight distribution (MWD) of polybutadiene polymerized in an otherwise gas phase process using a rare earth catalyst is provided.
6437205 Low molecular weight high-cis polybutadienes and their use in high molecular weight-low molecular weight high-cis polybutadiene blends  
A process for polymerizing 1,3-butadiene into a low molecular weight high-cis polybutadiene is described using a catalyst system comprising: (a) a neodymium-containing compound, (b) an aluminoxane...
6426387 Golf ball core  
A golf ball core incorporates a cobalt-catalyzed polybutadiene rubber falling within particular specifications for various material values. The material allows for manufacture of a core having a...
6388149 Process for reacting an organic compound in the presence of a supported ruthenium catalyst  
A process for the reaction of an organic compound in the presence of a catalyst comprising, as active metal, ruthenium alone or together with at least one Group Ib, VIIb, or VIIIb metal in an...
6350833 Method for the suspension polymerization of conjugated dienes  
This invention relates to a method for the suspension polymerization of conjugated dienes in hydrocarbon mixtures comprising a fraction by volume greater than 80% of C4 hydrocarbons wherein...
6344527 Method for the production of polydienes with regulated mooney viscosity  
This invention relates to a process for the production of polydienes having controlled Mooney viscosity, carried out by means of catalysts based on rare earth compounds, which is characterized in...
6291615 Catalyst system, the use thereof in the polymerization of dienes in a solution, suspension and vapor phase and the use of diene rubbers produced therewith  
The present invention is directed to a catalyst system, the use thereof in the polymerization of dienes in a solution, suspension and vapor phase, and the use of diene rubbers produced therewith,...
6255420 Start-up process for gas phase production of polybutadiene  
A process for starting a polymerization of butadiene to produce polybutadiene in a gas phase reactor having a seed bed which comprises (i) passivating the reactor and the seed bed by introducing an...
6156861 Carbamate-functional allyl monomers and polymers therefrom  
Carbamate-functional allyl monomers and methods for making them are disclosed. The monomers, which are easy to prepare, readily polymerize with common ethylenic monomers to give...
6136931 Process for preparing polybutadiene using catalyst with high activity  
This invention relates to a process for preparing polybutadiene with high 1,4-cis content (over 97%) and high conversion (over 90%) in such a manner that 1,3-butadiene is polymerized using an aging...
6066705 Vapor phase synthesis of cis-1, 4-Polyisoprene  
By utilizing the vapor phase polymerization techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polyisoprene rubber and high...
6013746 Process for controlling the molecular weight distribution of high 1,4-cis polybutadiene  
This invention relates to a process for controlling the molecular weight distribution of high 1,4-cis polybutadiene and more particularly, to a process of easily controlling the molecular weight...
5981667 Impact-resistant polystyrene resin composition  
Rubber-modified, impact-resistant polystyrene resin compositions having a well balanced combination of improved properties such as tensile strength and tensile elongation as well as reactivity with...
Matches 1 - 50 out of 305 1 2 3 4 5 6 7 >