Butadiene copolymer and process for preparing same

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5290878
SERIAL NO

08072488

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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, LIMITEDOSAKA2392

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Saito, Yuichi Kobe, JP 127 1329
Tsuji, Mitsuji Ichihara, JP 26 335
Wakatsuki, Kizuku Ichihara, JP 22 165
Yamamoto, Keisaku Ichihara, JP 34 281

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SUMITOMO RUBBER INDUSTRIES, LTD. (1)
* 4482678 Diene rubber composition and tire using it in tread 15 1983
 
JAPAN SYNTHETIC RUBBER CO., LTD. (1)
* 4742124 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 13 2008
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KURARAY CO., LTD. (1)
9102766 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)
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CHI MEI CORPORATION (2)
* 9056526 Modified copolymer of conjugated diene and vinyl aromatic hydrocarbon and polymerization method thereof 0 2013
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* Cited By Examiner