Modified conjugated diene copolymer, rubber compositions and...

Details Modified conjugated diene copolymer, rubber compositions and... Modified conjugated diene copolymer, rubber compositions and...

2011-06-28

2011-06-28

Choi, Ling-Siu (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S352000, C525S379000, C525S342000, C525S383000, C525S332800, C525S333100, C525S333200

Reexamination Certificate

active

07968652

ABSTRACT:
The present invention provides a modified conjugated diene polymer that is prepared by polymerization of a conjugated diene compound using a catalyst containing a lanthanoid rare earth element compound in an organic solvent and then modifying the resulting polymer having an active organic metal site with a modifier, wherein the modification efficiency is not less than 15% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (I):in-line-formulae description="In-line Formulae" end="lead"?cis-1,4 bond content≧98.00(%)  (I),in-line-formulae description="In-line Formulae" end="tail"?or the modification efficiency is not less than 75% and the cis-1,4 bond content in the conjugated diene moiety measured by Fourier transform infrared spectroscopy satisfies the relationship (II):in-line-formulae description="In-line Formulae" end="lead"?94.00(%)≦cis-1,4 bond content<98.00(%)  (II).in-line-formulae description="In-line Formulae" end="tail"?The invention further provides a rubber composition containing the modified conjugated diene polymer and giving a tire exhibiting low heat build-up, satisfactory failure characteristics, and high abrasion resistance, and a tire composed of the rubber composition and exhibiting these characteristics.

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