US Patent No: 5,290,878

Number of patents in Portfolio can not be more than 2000

Butadiene copolymer and process for preparing same

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Abstract

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An elastomeric butadiene copolymer prepared by a process which comprises copolymerizing butadiene, a polyvinyl aromatic compound and optionally styrene in a hydrocarbon solvent in the presence of an organolithium polymerization initiator and subjecting the resulting copolymer having lithium at the polymer end or ends to a coupling reaction with a trifunctional or tetrafunctional coupling agent, said butadiene copolymer satisfying the following conditions: (a) the content of styrene is at most 50% by weight, (b) the content of vinyl bonds in the butadiene portion is from 10 to 90% by weight, (c) the molecular weight distribution curve obtained by a high performance liquid chromatography has at least three peaks, and 5 to 60% by weight of all the polymer chains have a molecular weight which is at least 5 times the molecular weight in terms of standard polystyrene corresponding to the peak appearing on the lowest molecular weight side of the high performance liquid chromatogram, and (d) the Mooney viscosity (ML.sub.1+4, 100.degree. C.) is from 30 to 200. The butadiene copolymer has an improved processability with excellent resilience, wet grip property, abrasion resistance and mechanical properties, and is suitable for tire use.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SUMITOMO CHEMICAL COMPANY, LIMITEDOSAKA2328

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Saito, Yuichi Kobe, JP 127 1279
Tsuji, Mitsuji Ichihara, JP 26 326
Wakatsuki, Kizuku Ichihara, JP 22 162
Yamamoto, Keisaku Ichihara, JP 34 274

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SUMITOMO RUBBER INDUSTRIES, LTD. (1)
* 4,482,678 Diene rubber composition and tire using it in tread 15 1983
 
JAPAN SYNTHETIC RUBBER CO., LTD. (1)
* 4,742,124 Rubber composition for use in tire 14 1987
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (2)
* 2010/0324,167 ONE-POT SYNTHESIS OF NANOPARTICLES AND LIQUID POLYMER FOR RUBBER APPLICATIONS 11 2008
* 2011/0172,364 Charged Nanoparticles And Method Of Controlling Charge 2 2010
 
KURARAY CO., LTD. (1)
9,102,766 Method for producing a hydrogenated block copolymer, hydrogenated block copolymer obtained by said production method and composition thereof 0 2010
 
SUMITOMO RUBBER INDUSTRIES, LTD. (1)
* 5,430,086 Rubber composition for tire treads 6 1993
 
NITTO DENKO CORPORATION (2)
7,390,759 Steel plate reinforcing sheet 0 2006
* 2007/0110,978 Steel plate reinforcing sheet 2 2006
 
BRIDGESTONE AMERICAS HOLDING, INC. (3)
7,205,370 Polymeric nano-particles of flower-like structure and applications 32 2004
* 2005/0154,117 Polymeric nano-particles of flower-like structure and applications 0 2004
7,238,751 Multi-layer nano-particle preparation and applications 46 2005
 
BRIDGESTONE CORPORATION (59)
7,576,155 Method for clay exfoliation, compositions therefore, and modified rubber containing same 4 2003
* 2006/0235,128 Method for clay exfoliation, compositions therefore, and modified rubber containing same 43 2003
8,063,142 Method of making nano-particles of selected size distribution 8 2004
7,718,737 Rubber composition containing functionalized polymer nanoparticles 8 2004
* 2009/0156,757 RUBBER COMPOSITION CONTAINING FUNCTIONALIZED POLYMER NANOPARTICLES 1 2004
7,112,369 Nano-sized polymer-metal composites 67 2004
* 2005/0282,956 Reversible polymer/metal nano-composites and method for manufacturing same 33 2004
7,998,554 Hydrophobic surfaces with nanoparticles 1 2004
* 2006/0008,618 Hydrophobic surfaces with nanoparticles 1 2004
7,572,855 Nano-composite and compositions manufactured thereof 4 2005
7,659,342 Polymer nano-particle with polar core and method for manufacturing same 8 2005
* 2006/0173,130 Polymer nano-particle with polar core and method for manufacturing same 29 2005
7,544,740 Multi-layer nano-particle preparation and applications 11 2005
* 2005/0197,462 Multi-layer nano-particle preparation and applications 34 2005
7,179,864 Polymer nano-strings 46 2005
* 2005/0215,693 Clay modified rubber composition and a method for manufacturing same 37 2005
8,057,899 Nano-particle preparation and applications 0 2005
* 2005/0192,408 Nano-particle preparation and applications 31 2005
7,718,738 Self assembly of molecules to form nano-particles 11 2005
* 2006/0084,722 Self assembly of molecules to form nano-particles 33 2005
9,061,900 Combined use of liquid polymer and polymeric nanoparticles for rubber applications 0 2005
7,538,159 Nanoparticles with controlled architecture and method thereof 11 2005
* 2007/0142,550 Combined use of liquid polymer and polymeric nanoparticles for rubber applications 30 2005
7,579,398 Nano-composite and compositions therefrom 2 2006
* 2009/0182,087 NANO-COMPOSITE AND COMPOSITIONS THEREFROM 1 2006
7,935,184 Method of preparing imidazolium surfactants 0 2006
7,884,160 Non-spherical nanoparticles made from living triblock polymer chains 8 2006
7,597,959 Core-shell fluorescent nanoparticles 7 2006
* 2008/0145,660 Fluorescent Nanoparticles 31 2006
8,877,250 Hollow nano-particles and method thereof 0 2006
8,697,775 Vulcanizable nanoparticles having a core with a high glass transition temperature 0 2006
7,649,049 Rubber composition containing a polymer nanoparticle 8 2006
7,601,772 Nano-composite and method thereof 2 2006
7,560,510 Nano-sized inorganic metal particles, preparation thereof, and application thereof in improving rubber properties 13 2006
* 2008/0286,374 Hollow nano-particles and method thereof 26 2006
* 2008/0149,238 Rubber composition containing a polymer nanoparticle 31 2006
* 2007/0161,734 Nano-composite and method thereof 6 2006
7,786,236 Polymeric nano-particles of flower-like structure and applications 7 2007
* 2007/0185,273 Polymeric Nano-Particles Of Flower-Like Structure And Applications 33 2007
* 2008/0160,305 Amphiphilic polymer micelles and use thereof 33 2007
7,553,909 Multi-layer nano-particle preparation and applications 11 2007
7,829,624 One-pot synthesis of nanoparticles and liquid polymer for rubber applications 10 2007
* 2009/0005,491 One-Pot Synthesis Of Nanoparticles And Liquid Polymer For Rubber Applications 25 2007
8,541,503 Polymeric core-shell nanoparticles with interphase region 1 2007
7,795,344 Nano-particle preparation and applications 7 2007
* 2009/0048,390 Nano-Particle Preparation And Applications 26 2007
8,349,964 Reversible polymer/metal nano-composites and method for manufacturing same 0 2008
* 2008/0305,336 Reversible Polymer/Metal Nano-Composites And Method For Manufacturing Same 26 2008
8,288,473 Disk-like nanoparticles 1 2008
* 2009/0054,554 Disk-like Nanoparticles 22 2008
7,897,690 Rubber composition containing functionalized polymer nanoparticles 8 2009
* 2010/0016,472 Rubber Composition Containing Functionalized Polymer Nanoparticles 19 2009
8,410,225 Fluorescent nanoparticles 0 2009
8,846,819 Core-first nanoparticle formation process, nanoparticle, and composition 0 2009
9,062,144 Hairy polymeric nanoparticles with first and second shell block polymer arms 0 2010
* 2011/0213,066 Hairy Polymeric Nanoparticles With First And Second Shell Block Polymer Arms 8 2010
9,115,222 Well defined, highly crosslinked nanoparticles and method for making same 0 2010
* 2011/0236,686 Well Defined, Highly Crosslinked Nanoparticles And Method For Making Same 8 2010
8,957,154 Disk-like nanoparticles 0 2012
 
CHI MEI CORPORATION (2)
* 9,056,526 Modified copolymer of conjugated diene and vinyl aromatic hydrocarbon and polymerization method thereof 0 2013
* 2014/0187,720 MODIFIED COPOLYMER OF CONJUGATED DIENE AND VINYL AROMATIC HYDROCARBON AND POLYMERIZATION METHOD THEREOF 0 2013
* Cited By Examiner