At Least Two Polymers Derived From Reactants Containing Two Or More Ethylenic Groups And Devoid Of An Aryl Ring Patents (Class 525/236)
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Publication number: 20110190440Abstract: This invention provides a rubber composition being excellent in the workability during production and the heat resistance and high in the storage elastic modulus (G?) and small in the loss tangent (tan ?), which is formed by compounding 1-60 parts by mass of a low-molecular weight conjugated diene-based polymer (B) having a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 10,000-200,000 and a vinyl bond content in a conjugated diene compound portion of not less than 40% based on 100 parts by mass of a rubber component (A) comprised of at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and isobutylene isoprene rubber, wherein the rubber component (A) comprises natural rubber and/or polyisoprene rubber and a proportion of styrene units in total of the low-molecular weight conjugated diene-based polymer (B) is less than 5% by mass.Type: ApplicationFiled: March 5, 2008Publication date: August 4, 2011Applicant: Bridgestone CorporationInventors: Fuminori Ohta, Koji Masaki
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Patent number: 7989547Abstract: Polyhydroxy curable fluoroelastomer compositions contain at least one process aid that is an aminosilicone having only a single primary amine group per polysiloxane molecule.Type: GrantFiled: May 28, 2009Date of Patent: August 2, 2011Assignee: DuPont Performances Elastomers LLC.Inventor: Steven R. Oriani
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Patent number: 7981966Abstract: There is obtained a rubber composition excellent in processability of unvulcanized compounded rubber, excellent in wear resistance and wet skid resistance of vulcanized rubber, low in rolling resistance, and suitable for tire applications, particularly for tire tread applications in which importance is given to low fuel consumption and safety. A rubber composition mainly comprising (I) 0.5 to 35% by weight of a conjugated diene-based (co)polymer rubber having an amino group and an alkoxysilyl group on a polymer chain and having a weight average molecular weight of 1,000 to 90,000, and (II) 99.5 to 65% by weight of a conjugated diene-based (co)polymer rubber having a weight average molecular weight of 100,000 to 2,000,000 (with the proviso that (I)+(II)=100% by weight).Type: GrantFiled: March 2, 2005Date of Patent: July 19, 2011Assignee: JSR CorporationInventors: Naokazu Kobayashi, Kouta Taniguchi, Toshihiro Tadaki
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Publication number: 20110172365Abstract: Rubber compositions, methods of making rubber compositions and articles comprising the rubber compositions that have crumb rubber particles in the rubber compositions. A cross-linked rubber composition, comprising a diene rubber and a masterbatch material comprising between 50 and 75 wt. % natural rubber and between 25 and 50 wt. % crumb rubber particles, wherein the crumb rubber particles are 40 mesh or smaller. A method for preparing a rubber composition having crumb rubber, the method comprising mixing a masterbatch, the masterbatch comprising between 50 and 75 wt. % natural rubber and between 25 and 50 wt. % crumb rubber particles and mixing the masterbatch with a diene rubber.Type: ApplicationFiled: July 31, 2009Publication date: July 14, 2011Inventors: Michael Brett Meredith, Mark J. Pender
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Publication number: 20110166277Abstract: It is to provide a high-elasticity rubber composition having a good workability and an excellent crack resistance while preventing the deterioration of rubber properties by using a vulcanization accelerator having a retarding effect equal to or more than that of DCBS without using a retarder such as CTP possibly causing the deterioration of rubber properties after the vulcanization and problems such as blooming and the like. The rubber composition according to the invention is characterized by comprising a rubber component, a sulfenamide-based vulcanization accelerator represented by a formula (I), trans-polybutadiene and sulfur.Type: ApplicationFiled: August 17, 2009Publication date: July 7, 2011Applicant: BRIDGESTONE CORPORATIONInventor: Yoshitaka Satou
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Patent number: 7947774Abstract: Solution blending of masterbatch of cationically functionalized polyvinyl acetate copolymer/silicate nanocomposite where the silicate is substantially exfoliated, and ethylene-vinyl acetate copolymer (EVA), produces product of increased tensile strength and Young's Modulus compared to neat EVA and reduced flammability compared to neat EVA. The product can be injection molded or compression molded or extruded without loss of these advantages.Type: GrantFiled: October 22, 2007Date of Patent: May 24, 2011Assignee: Cornell Research Foundation, Inc.Inventors: Dotsevi Y. Sogah, Yaru Shi
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Publication number: 20110118404Abstract: Natural rubber blends, methods for making the same, and articles made therefrom are provided. The natural rubber blend includes at least one propylene copolymer containing ethylene derived units. The natural rubber blend can further include one or more reinforcing fillers, such as carbon black. The presence of the propylene copolymer significantly improves the ozone resistance and ageing properties of the natural rubber gum stock.Type: ApplicationFiled: November 18, 2009Publication date: May 19, 2011Inventors: Hyun-Dae Jung, Khee Sio Yeo, Milind Balwant Joshi, Pradeep Pandurang Patki, Bharat Bhushan Sharma, Manjunatha Hanumanthappa
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Patent number: 7939594Abstract: The invention provides a composition that contains at least one specific non-crosslinkable organic medium at least one microgel and at least one thickening agent, a process for the preparation thereof and uses of the compositions.Type: GrantFiled: March 13, 2006Date of Patent: May 10, 2011Assignees: Rhein Chemie Rheinau GmbH, LANXESS Deutschland GmbHInventors: Werner Obrecht, Torsten Ziser, Thomas Früh, Patrick Galda, Achim Fessenbecker
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Patent number: 7914868Abstract: Improved single ply, water proof roof coverings having an extruded pressure sensitive rubber-based adhesive backing for attachment to a substrate such as the roof of a building or a transport vehicle, the adhesive consisting of polyisobutylene and at least one polymer comprising conjugated diene monomers.Type: GrantFiled: February 10, 2005Date of Patent: March 29, 2011Assignee: Building Materials Investment CorporationInventors: Michael P. Naipawer, III, Anthony Ruffine
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Patent number: 7875678Abstract: Compositions, processes, and methods are provided relating to styrenic polymers, including high impact polystyrene (HIPS), also referred to as rubber-modified polystyrene. In one aspect, a process is provided for making high impact polystyrenes, comprising the steps of combining a monovinylarene component, a monovinylarene-conjugated diene block copolymer, and a conjugated diene polymer. In another aspect, the feed components form an emulsion having a continuous phase and a dispersed phase. The continuous phase comprises at least a portion of the monovinylarene component and at least a portion of the conjugated diene polymer. The dispersed phase is suspended within the continuous phase, and comprises globules having at least a portion of the monovinylarene-conjugated diene block copolymer, a remaining portion of the monovinylarene component, and a remaining portion of the conjugated diene polymer.Type: GrantFiled: April 11, 2006Date of Patent: January 25, 2011Assignee: Chevron Phillips Cheimcal Company, LPInventors: Michael J. Hanner, Chen-Youn Sue, Clifford C. Pettey, Carleton Stouffer, Paul M. Hunt, Ken E. Bowen
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Patent number: 7875669Abstract: A production process of a rubber composition superior in low rolling resistance, air permeation resistance and durability performance is provided, the production process comprising the following (X), (Y) and (F): (1) step (X) of kneading a rubber component (A) including a butyl rubber and filler for reinforcement, (2) step (Y) of then adding a rubber component (B) and mica to the kneaded article obtained by step (X) and kneading it, and (3) step (F) of then further adding sulfur, a vulcanization accelerator and a vulcanization accelerating aid to the kneaded article obtained by step (Y) and kneading it, wherein 10 to 50 parts by mass of mica and/or talc is included based on 100 parts by mass of the whole rubber components (C).Type: GrantFiled: July 9, 2009Date of Patent: January 25, 2011Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Tatsuya Miyazaki
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Publication number: 20100331800Abstract: Provided herein are composition comprising a farnesene interpolymer. The farnesene interpolymer can be derived from a farnesene and at least one vinyl monomer. In some embodiments, the mole percent ratio of the farnesene to the at least one vinyl monomer is from about 1:4 to about 100:1. In certain embodiments, the farnesene is ?-farnesene, ?-farnesene or a combination thereof. In some embodiments, the at least one vinyl monomer is ethylene, an ?-olefin such as styrene, or a substituted or unsubstituted vinyl halide, vinyl ether, acrylonitrile, acrylic ester, methacrylic ester, acrylamide or methacrylamide, or a combination thereof.Type: ApplicationFiled: June 29, 2010Publication date: December 30, 2010Applicant: Amyris Biotechnologies, Inc.Inventor: Derek James MCPHEE
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Patent number: 7829604Abstract: The invention provides a golf ball composed of a hot-molded material obtained by vulcanizing a rubber composition made primarily of a base rubber and an unsaturated carboxylic acid or salt thereof, wherein the rubber composition additionally includes a vulcanized rubber powder from which soluble ingredients have been removed by liquid washing. The golf ball of the invention is able to increase the hardness (deflection) of the core and has an excellent durability, in addition to which it effectively re-uses vulcanized rubber powder that is a waste material and so is industrially beneficial by lowering manufacturing costs and reducing the burden on the environment.Type: GrantFiled: April 4, 2007Date of Patent: November 9, 2010Assignee: Bridgestone Sports Co., Ltd.Inventor: Toshiro Wachi
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Publication number: 20100261847Abstract: Provided are a molecular weight controllable, high 1,4-trans polybutadiene catalyst system, and more particularly, a four-component catalyst for preparing 1,4-trans polybutadiene with high yield, the catalyst comprising a cobalt compound, an organoaluminum compound, a phenol-based compound, and a phosphorus-based compound used to prepare 1,4-trans polybutadiene by polymerizing butadiene or a butadiene derivative, and capable of controlling the molecular weight of 1,4-trans polybutadiene by regulating the amount of the phosphorus-based compound. In particular, 1,4-trans polybutadiene may be efficiently applied to tires, belts, or the like since it has excellent tensile strength, tear strength, and cut & chip properties with increasing processability.Type: ApplicationFiled: January 12, 2010Publication date: October 14, 2010Inventors: Hwieon Park, Gwang Hoon Kwag, Hoochae Kim, Seung Hwon Lee
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Publication number: 20100205764Abstract: A rubber material of a wiper blade for windshield wipers is described, which comprises a first rubber component of a first polarity and a second rubber component of a second greater polarity. To equalize the first and second polarities, the first rubber component is at least partially replaced by a chemically functionalized derivative.Type: ApplicationFiled: September 29, 2008Publication date: August 19, 2010Applicant: ROBERT BOSCH GMBHInventors: Eric Pieters, Reiner Lay, Hilde Parton
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Patent number: 7776968Abstract: The invention provides a thermoplastic elastomer composition comprising: (a) 100 parts by weight of a hydrogenated block copolymer; (b) 0.01 to 3 parts by weight of an organic peroxide; and (c) 1 to 80 parts by weight of a carboxylated liquid polybutadiene. Also disclosed is a thermoplastic resin composition comprising the thermoplastic elastomer composition.Type: GrantFiled: February 3, 2005Date of Patent: August 17, 2010Assignee: Riken Technos Corp.Inventors: Michihisa Tasaka, Satoshi Takahashi
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Patent number: 7764487Abstract: A display has a closed body, a display panel, an inactive propeller, an inactive magnet and a driving assembly. The closed body has an inner cavity and liquid. The display panel is mounted around by the closed body. The inactive propeller is mounted rotatably in the inner cavity and has multiple blades to agitate the liquid. The inactive magnet is mounted securely in the inactive propeller. The driving assembly is mounted on the closed body outside the inner cavity and has a power unit, a shaft and an active magnet. The active magnet is attached to the shaft and corresponds to the inactive magnet. With the magnetic force between the active and inactive magnets, the power is transmitted into the closed body without any physical contact. Therefore, the closed body does not require any waterproof structures and the liquid maintains clean and isolated from the outer environment.Type: GrantFiled: October 15, 2008Date of Patent: July 27, 2010Assignee: Hannspree, Inc.Inventors: Wen-Hung Huang, Chien-Kun Hsu
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Publication number: 20100168312Abstract: Abrasion resistance can be improved without impairing tip cut resistance by using polybutadiene comprising specific syndiotactic-1,2-polybutadiene in a tread rubber. Namely, the present invention provides a rubber composition for a tread which comprises a rubber component comprising 10 to 30% by weight of a butadiene rubber in which syndiotactic-1,2-polybutadiene having an average primary particle diameter of not more than 100 nm is dispersed in the butadiene rubber.Type: ApplicationFiled: December 25, 2006Publication date: July 1, 2010Inventors: Hirokazu Ishida, Masataka Hiro, Takashi Wada
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Publication number: 20100152389Abstract: A vinyl.cis-polybutadiene rubber is provided containing 1,2-polybutadiene and a polymer substance of a melting point lower than that of the 1,2-polybutadiene and with at least one unsaturated double bond per repeating unit, where the 1,2-polybutadiene and the polymer substance are dispersed at physically and/or chemically adsorbed states in the cis-polybutadiene rubber as the matrix component of the vinyl.cis-polybutadiene rubber, and a method for producing the same, to provide a vulcanized product exerting a small die swell ratio and excellent extrusion processability and operability, as well as very great characteristics demanded for the side tread of tire and the like.Type: ApplicationFiled: March 1, 2010Publication date: June 17, 2010Applicant: UBE INDUSTRIES, LTD.Inventors: Yoshio ASAKURA, Yasuyoshi OKABE
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Publication number: 20100137520Abstract: Branched polymers including multi-branched polymers, functionalized branched polymers, star-branched polymers, and dendigraft polymers. Methods for the synthesis of branched polymers and method for the use of branched polymers in tire components are also included.Type: ApplicationFiled: October 5, 2007Publication date: June 3, 2010Inventors: Christopher G. Robertson, Sandra Warren, James Hall, Georg G.A. Böhm, Mark Arigo, Steven Luo, Hiroshi Mouri, Jessica Kurasch, Noriko Mori
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Publication number: 20100137519Abstract: This invention relates to a process for preparing a vulcanized rubber blend, said blend comprising (a) natural rubber or poly-isoprene rubber, (b) butadiene based rubber, and (c) rubber with an essentially saturated backbone. The improvement is that rubber c) is pre-heated with at least part of the vulcanization system before mixing with rubbers a) and b) and co-vulcanizing.Type: ApplicationFiled: February 21, 2006Publication date: June 3, 2010Inventors: Jacobus Wilhelmus Maria J.W.M. Noordermeer, Nityananda L. Naskar, Rabindra Nath R.N. Datta
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Publication number: 20100130669Abstract: A modified hydrogenated diene polymer composition includes (A) a modified hydrogenated diene polymer obtained by hydrogenating a diene polymer having a vinyl bond content of 20 to 70%, the modified hydrogenated diene polymer having a weight average molecular weight (Mw) of 100,000 to 1,700,000, a molecular weight distribution (Mw/Mn) of 1.0 to 3.0, and a hydrogenation rate of 72 to 96%, and containing a functional group, and (B) a diene rubber, the modified hydrogenated diene polymer composition containing the modified hydrogenated diene polymer (A) and the diene rubber (B) in an amount of 100 parts by mass in total, the amount of the modified hydrogenated diene polymer (A) being 60 to 95 parts by mass, and the amount of the diene rubber (B) being 5 to 40 parts by mass.Type: ApplicationFiled: March 28, 2008Publication date: May 27, 2010Applicant: JSR CORPORATIONInventors: Motoharu Higuchi, Takahisa Suzuki, Kenji Hasegawa, Naoya Nosaka
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Publication number: 20100113699Abstract: A process for preparing a rubber comprising polymeric composition, and the resulting compositions, and certain isoprene comprising interpolymers.Type: ApplicationFiled: December 21, 2007Publication date: May 6, 2010Inventors: Mark N. Dedecker, James E. Hall, Daniel F. Graves
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Publication number: 20100084071Abstract: This invention relates to a tire having at least one rubber component which contains a cast, extruded, or calendered film of syndiotactic polybutadiene polymer. The syndiotactic polybutadiene polymer film is integral with the surface of the rubber component in a sense of being co-cured therewith. Such film may be added directly to the tire during the building process or involve a separate process of producing a tire component as a composite of the film and a rubber composition (rubber component) prior to the tire building stage. Such composite can be as is or partially pre-cured before being applied in the tire building process. The syndiotactic polybutadiene polymer film is provided to promote both stability and age durability for the tire component.Type: ApplicationFiled: October 6, 2008Publication date: April 8, 2010Inventor: Paul Harry Sandstrom
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Patent number: 7683136Abstract: An elastomeric compound comprises 20-80 parts per hundred cross-linkable materials of liquid elastomer. The liquid elastomer has a complex dynamic viscosity less than 5 McP (5,000 N*s/m2) at a temperature between 20° C. and the maximum flow temperature TF, and the elastomeric compound the elastomeric material has a complex dynamic viscosity of less than 5 McP (5,000 N*s/m2) for at least 2 minutes at a maximum flow temperature TF.Type: GrantFiled: June 16, 2005Date of Patent: March 23, 2010Assignee: VeyanceTechnologies, Inc.Inventors: Douglas Bruce Wood, Thomas George Burrowes
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Publication number: 20100018778Abstract: Seals and sealing members are formed from a composition generally comprising a first elastomeric material and a second elastomeric material, wherein the second elastomeric material comprises a dispersion of nanosized particles disposed within a polymer matrix of the second elastomeric material. Preferred first and second elastomeric materials are fluoroelastomers, and preferred nanosized particles are fluoropolymers. The nanosized particles are sized less than about 100 nm. The composition comprises about 0.2 to 65 percent by weight of first elastomeric material, about 20 to 95 percent by weight of second elastomeric material, and about 10 to 90 percent by weight particles based on the total weight of the particles and the second elastomeric material. The composition can be used to form annular O-ring seals placed within rotary cone bits used for drilling subterranean formations, and can be used to form a selected portion of the seal or the entire seal.Type: ApplicationFiled: July 23, 2008Publication date: January 28, 2010Applicant: SMITH INTERNATIONAL, INC.Inventor: Saman Chandana Nanayakkara
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Publication number: 20090298617Abstract: The invention provides a golf ball material composed of a polymer material that contains spherical inorganic particulates, which is well adapted for use in at least one component of a golf ball composed of one or more layers. The golf ball material of the invention improves the flight performance of golf balls compared with polymer materials containing amorphous inorganic particulates.Type: ApplicationFiled: May 28, 2008Publication date: December 3, 2009Applicant: Bridgestone Sports Co., Ltd.Inventors: Yoshinori EGASHIRA, Jun Shindo, Eiji Takehana
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Patent number: 7615591Abstract: A rubber composition comprises a diene rubber component, a filler and a softening agent, in which a given amount of a filler is compounded based on 100 parts by mass of a diene rubber component, and a softening agent is included in a given amount per the filler, and not less than 60% by mass of the diene rubber component is a solution-polymerized styrene-butadiene copolymer rubber having a mass average molecular weight of not less than 1,000,000, and the filler is selected from the group consisting of carbon black, silica and an inorganic agent of a formula (I): mM.xSiOy.zH2O (wherein M is at least one metal selected from the group consisting of aluminum, magnesium, titanium and calcium, or an oxide of such a metal or a hydroxide of such a metal, m is a number of 1-5, x is a number of 0-10, y is a number of 2-5 and z is a number of 0-10), wherein each of the filler and the softening agent is charged in at least two fractions.Type: GrantFiled: February 2, 2005Date of Patent: November 10, 2009Assignee: Bridgestone CorporationInventor: Hideki Matsui
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Publication number: 20090247705Abstract: A rubber composition includes (i) an ?,?-unsaturated nitrile conjugated diene rubber containing structural units derived from a conjugated diene in an amount of 30 to 60 mass % with respect to the total structural units, (ii) an ethylene-?-olefin-nonconjugated diene copolymer rubber having a limiting viscosity of 3.3 dl/g or more measured at 135° C. in a decalin solvent, and (iii) a crosslinking agent. The rubber composition can produce a crosslinked rubber and a molded article exhibiting excellent oil resistance and heat resistance in a well-balanced manner.Type: ApplicationFiled: March 1, 2007Publication date: October 1, 2009Applicant: JSR CORPORATIONInventors: Mamoru Hasegawa, Kenji Hasegawa, Toshihiro Tadaki
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Patent number: 7592397Abstract: A polymer composition comprises at least an ethylene/?-oleiln interpolymer and at least one other polymer. The other polymer can be selected from a second ethylene/?-olefin interpolymer, an elastomer, a polyolefin, a polar polymer, and an ethylene/carboxylic acid interpolymer or ionomer thereof. The ethylene/?-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block interpolymer has a number of unique characteristics disclosed here. Also provided are gaskets, bottle cap liners, and closures that comprise or obtained from a compositon comprising at least one ethylene/?-olefin interpolymer and at least one polyolefin. The gaskets are capable of compression sealing various containers, without contaminating the contents. Liquid containers particularly benefit from the use of the novel gasket materials disclosed herein.Type: GrantFiled: March 15, 2006Date of Patent: September 22, 2009Assignee: Dow Global Technologies Inc.Inventors: Ronald P. Markovich, Dale M. Elley-Bristow, Miguel A. Prieto, Russell P. Barry, Felipe Martinez, Daniel J. Falla, Julien H. J. M. Damen
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Patent number: 7517927Abstract: A flexible thermoplastic composition comprises poly(arylene ether); a plasticizer having an affinity for polyolefin; a polyolefin and a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene, wherein the polyolefin comprises (i) an ethylene/C7-C20 alpha olefin copolymer having an alpha olefin content greater than or equal to about 10%, (ii) a thermoplastic vulcanizate (iii) a combination of linear low density polyethylene and a thermoplastic vulcanizate, (iv) a combination of an ethylene/C7-C20 alpha olefin copolymer having an alpha olefin content greater than or equal to about 10%, a linear low density polyethylene, and a thermoplastic vulcanizate, (v) a combination of an ethylene/C7-C20 alpha olefin copolymer having an alpha olefin content greater than or equal to about 10% and a thermoplastic vulcanizate or (vi) a combination of an ethylene/C7-C20 alpha olefin copolymer having an alpha olefin content greater than or equal to about 10% and linear low density polyethylene.Type: GrantFiled: November 29, 2004Date of Patent: April 14, 2009Assignee: Sabic Innovative Plastics IP B.V.Inventors: Kazunari Kosaka, Xiucuo Li, Vijay Mhetar, Jeffery Tenenbaum, Weiguang Yao
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Patent number: 7511108Abstract: 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 content and proper number average molecular weight and molecular weight distribution, and more particularly to a pneumatic tire characterized in that a rubber composition including a polybutadiene with a cis-1,4 bond content of not less than 99.0% and a vinyl bond content of not more than 0.3% as measured by a Fourier transform infrared spectroscopy is used in any one of tire members.Type: GrantFiled: July 1, 2004Date of Patent: March 31, 2009Assignee: Bridgestone CorporationInventors: Eiju Suzuki, Yoichi Ozawa, Shojiro Kaita, Yasuo Wakatsuki
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Publication number: 20090078354Abstract: A method of effecting an improved adhesive bond between a rubber surface and a device adhered thereto is disclosed. In pneumatic tires, monitoring devices are more securely adhered to the innerliner of the tire utilizing a room temperature vulcanizable adhesive wherein curing is facilitated in the presence of moisture. The innerliner formulation is prepared by incorporating a material which has incomplete compatibility with the rubber of the innerliner formulation, and which has hygroscopic properties which thereby tends to attract moisture.Type: ApplicationFiled: December 5, 2008Publication date: March 26, 2009Applicant: The Goodyear Tire & Rubber CompanyInventors: Bruce Raymond Hahn, Peter Ross Shepler
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Publication number: 20090048390Abstract: A nano-particle composition including a poly(alkenylbenzene) core and a poly(conjugated diene), a poly(alkylene), or a poly(alkenylbenzene) surface layer is provided. The nano-particles have a mean average diameter of less than about 100 nm. The nano-particles can be modified via, for example, hydrogenation or functionalization. The nano-particles can be advantageously be incorporated into rubbers, elastomers, and thermoplastics.Type: ApplicationFiled: November 16, 2007Publication date: February 19, 2009Inventors: Xiaorong Wang, Chenchy Jeffrey Lin, James Hall, Sandra Warren, James Krom, Hajime Kondo, Koichi Morita
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Publication number: 20090020207Abstract: There is provided a rubber composition for a chafer, enabling generation of crack in a chafer at mounting or dismounting a rim to be suppressed as well as improving durability of a bead part by improving hardness and elongation at break. Namely, the present invention provides a rubber composition for a chafer, which comprises a rubber component comprising a butadiene rubber in which syndiotactic-1,2-polybutadiene having an average primary particle diameter of not more than 100 nm is dispersed, and has a JIS-A harness of 75 to 85 and elongation at break in a tensile test of not less than 180%.Type: ApplicationFiled: December 25, 2006Publication date: January 22, 2009Inventors: Hirotoshi Otsuki, Takashi Wada
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Publication number: 20090018272Abstract: The object of the present invention is to provide a rubber composition suitable for a studless tire, which can inhibit rubber hardness increase with time and reveals excellent performance on ice and snow for a long time. The present invention relates to a rubber composition comprising 1 to 60 parts by weight of hydrogenised liquid polybutadiene based on 100 parts by weight of a rubber component containing at least 80% by weight of a natural rubber and a butadiene rubber, wherein a peak temperature of tan ? is at most 45° C. and rubber hardness at 0° C. is at most 64.Type: ApplicationFiled: July 11, 2008Publication date: January 15, 2009Inventors: Takayuki Hattori, Naohiko Kikuchi, Ryoji Kojima
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Publication number: 20090000720Abstract: A rubber composition for a sidewall, in which balance between tip cut resistance and heat build-up property of a sidewall is enhanced, is provided. Namely, the present invention relates to a rubber composition for a sidewall, comprising a rubber component comprising 10 to 60% by weight of a butadiene rubber, wherein syndiotactic-1,2-polybutadiene having an average primary particle diameter of not more than 100 nm is dispersed in the butadiene rubber.Type: ApplicationFiled: December 25, 2006Publication date: January 1, 2009Inventors: Hirokazu Ishida, Hirotoshi Otsuki, Takashi Wada
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Patent number: 7465768Abstract: A novel method of preparing carboxyl-terminated polymers. A monomer is mixed with an organolithium initiator in a hydrocarbon solvent so as to anionically polymerize linear living polymer lithium chains. A trialkyl aluminum compound is also mixed so as to form polymer lithium: aluminate complexes in equilibrium with the linear living polymer lithium chains. When a cyclic anhydride terminator is mixed, the cyclic anhydride terminator preferentially reacts with the C—Li center on a living polymer lithium chain rather than with the C—Al—Li center on a polymer lithium: aluminate complex.Type: GrantFiled: May 25, 2005Date of Patent: December 16, 2008Assignee: Bridgestone CorporationInventors: James E. Hall, James Oziomek
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Patent number: 7462677Abstract: An initiator is presented for anionically polymerizing monomers, to provide a functional head group on the polymer. A polymer having a functional head group derived from a sulfur containing anionic initiator, and optionally as additional functional group resulting from the use of a functional terminating reagent, coupling agent or linking agent is also provided. A method is presented for anionically polymerizing monomers comprising the step of polymerizing the monomers with a sulfur containing anionic initiator to provide a functional head group on the polymer. An elastomeric compound, comprising a functional polymer and filler is also described. Also provided is a tire having decreased rolling resistance resulting from a tire component containing a vulcanizable elastomeric compound.Type: GrantFiled: September 13, 2007Date of Patent: December 9, 2008Assignee: Bridgestone CorporationInventors: Terrence E. Hogan, William Hergenrother, Yuan-Yong Yan, David Lawson
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Patent number: 7458406Abstract: There is provided a rubber composition for a side wall, wherein an amount ratio of resources other than petroleum are increased so as to be ecological and take measures for the decrease in supply of petroleum in the future, which further has excellent flex crack resistance and strength. A rubber composition for a side wall comprising 20 to 60 parts by weight of silica based on 100 parts by weight of a rubber component comprising 40 to 80% by weight of a natural rubber and 60 to 20% by weight of at least one rubber selected from the group consisting of a butadiene rubber, a styrene-butadiene rubber and an epoxidized natural rubber, and 4 to 16 parts by weight of a silane compound represented by the following formula: Xn—Si—Y4-n (wherein X represents an ethoxy group or a methoxy group, and Y represents a phenyl group or an alkyl group) based on 100 parts by weight of silica.Type: GrantFiled: August 11, 2006Date of Patent: December 2, 2008Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Takao Wada, Mamoru Uchida, Tomoaki Hirayama
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Patent number: 7423089Abstract: This invention relates to preparation of rubber compositions comprised of EPDM and conjugated diene-based elastomer, particularly including cis 1,4-polyisoprene rubber, and particularly natural cis 1,4-polyisoprene rubber, blends and pneumatic rubber tire with an outer, visible sidewall layer of a rubber composition comprised of such rubber composition. For such preparation, a combination of at least two diverse EPDM elastomers is used together with a phase mixing process comprised of sequential phase mixing or parallel phase mixing in the sense of reinforcement filler and sulfur curatives.Type: GrantFiled: October 13, 2005Date of Patent: September 9, 2008Assignee: The Goodyear Tire & Rubber CompanyInventors: Junling Zhao, Aaron Scott Puhala, Bina Patel Botts, Brad Stephen Gulas
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Publication number: 20080190532Abstract: This invention relates to a rubber composition including a polyisoprene rubber having a very high cis-1,4-bond content and having an excellent balance between dynamic properties and processability, and more particularly to a rubber composition comprising as a rubber component (A) a synthetic polyisoprene rubber having a cis-1,4-bond content of not less than 99.0%, a 3,4-bond content of not more than 0.5% and a Mooney viscosity ML1+4 (100° C.) of 20-110 and (B) a natural rubber.Type: ApplicationFiled: June 25, 2004Publication date: August 14, 2008Inventors: Eiju Suzuki, Yoichi Ozawa
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Patent number: 7393902Abstract: A rubber composition for a base tread which achieves improved steering stability and rolling resistance properties and a tire containing the same wherein the rubber composition includes a rubber component containing (a) 20 to 60% by weight of a polybutadiene rubber containing 2.5 to 20% by weight of a 1,2-syndiotactic polybutadiene crystal, (b) 5 to 80% by weight of a tin-modified polybutadiene rubber polymerized by a lithium initiator, in which the amount of a tin atom is 50 to 3000 ppm, the amount of a vinyl bond is 5 to 50% by weight and molecular weight distribution (Mw/Mn) is at most 2, and (c) 10 to 75% by weight of a rubber other than (a) and (b).Type: GrantFiled: September 14, 2005Date of Patent: July 1, 2008Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Tatsuya Miyazaki
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Patent number: 7390850Abstract: A thermoplastic elastomer composition comprises a blend of a thermoplastic component with a cured elastomer component characterised in that the elastomer component prior to curing comprises a major proportion of a main elastomer and a minor proportion of a high molecular weight reactive polymer which shows a higher crosslinking efficiency in free-radical induced vulcanisation than the main elastomer. Preferably, the high molecular weight reactive polymer comprises from (3) to (15), and more preferably (4) to (10), parts by weight per one hundred parts of the total elastomer component of the composition. The use of the high molecular weight reactive polymer in the composition improves the low temperature performance of the composition and gives improvements to the processing behaviour, the resistance to stiffening at low temperatures and recovery/relaxation properties. Preferably, the high molecular weight reactive polymer is miscible with the main elastomer in the elastomer component.Type: GrantFiled: December 9, 2002Date of Patent: June 24, 2008Assignee: Tun Abdul Razak Research CentreInventors: Stuart Cook, Andrew Tinker, Jaymini Patel
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Patent number: 7367369Abstract: The invention relates to an aircraft tire with a tread having a running surface of a rubber composition which contains elastomers of which a major portion is a specialized cis 1,4-polybutadiene elastomer and a minor portion is cis 1,4-polyisoprene rubber and which contains reinforcement filler comprised of a combination of precipitated silica and defined rubber reinforcing carbon black.Type: GrantFiled: September 23, 2004Date of Patent: May 6, 2008Assignee: The Goodyear Tire & Rubber CompanyInventors: Paul Harry Sandstrom, George Frank Balogh, Steven Wayne Cronin
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Publication number: 20080058474Abstract: A rubber composition for golf balls, comprises a base polymer consisted of (A) 20-99 weight parts of high cis polybutadiene synthesized in the presence of a cobalt-based catalyst and having a Mooney viscosity of 50-70 and a molecular weight distribution (Weight average molecular weight (Mw)/ Number average molecular weight (Nw)) of 2.5-3.8, and (B) 80-1 weight part(s) of high cis polybutadiene synthesized in the presence of a non-cobalt-based catalyst and having a Mooney viscosity of 30-70; and a crosslinking coagent.Type: ApplicationFiled: December 6, 2005Publication date: March 6, 2008Inventors: Naomi Okamoto, Kouji Ishiguchi
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Patent number: 7300983Abstract: A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g?LCB-1g?LCB that is less than about 0.22, where 1g?LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g?LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.Type: GrantFiled: August 17, 2004Date of Patent: November 27, 2007Assignee: Dow Global Technologies Inc.Inventors: Alexander W. Degroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund M. Carnahan, David Gillespie, Daniel D. Vanderlende
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Patent number: 7291663Abstract: A conductive roller or a conductive belt is composed of a conductive elastomer composition including a polymer composition having a plurality of carbon-to-carbon double bonds and containing not less than 40 mol % of ethylene oxide; an organometallic salt containing a fluoro group or/and a sulfonyl group; and an elastomer having a plurality of carbon-to-carbon double bonds.Type: GrantFiled: June 16, 2003Date of Patent: November 6, 2007Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Takayuki Hattori, Tetsuo Mizoguchi
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Patent number: 7268187Abstract: The present invention provides a rubber composition for a sidewall or a clinch having improved cut resistance, crack growth resistance and low fuel consumption for an automobile the present invention relates to a rubber composition for a side wall or a clinch comprising a rubber component containing: (a) 20 to 60% by weight of polybutadiene rubber containing 2.5 to 20% by weight of crystal 1,2-syndiotactic polybutadiene, (b) 5 to 40% by weight of a tin modified polybutadiene rubber polymerized by a lithium initiator, wherein the amount of tin atoms is 50 to 3000 ppm, the amount of vinyl bonds is 5 to 50% by weight and molecular weight distribution (mw/mn) is at most 2, and (c) 20 to 75% by weight of a rubber except for (a) and (b).Type: GrantFiled: August 24, 2005Date of Patent: September 11, 2007Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Tatsuya Miyazaki
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Patent number: RE42276Abstract: A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 12.5 and y is greater than or equal to about 3. Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.Type: GrantFiled: October 23, 2009Date of Patent: April 5, 2011Assignee: Dow Global Technologies LLCInventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende