Process for producing modified polymer, modified polymer obtained by the process, and rubber composition thereof
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United States of America Patent
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Apr 20, 2010
Grant Date -
Aug 7, 2008
app pub date -
Mar 17, 2006
filing date -
Mar 18, 2005
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Abstract
A process for producing a modified polymer which increases low heat buildup and reinforcing capability of a rubber composition and which has excellent abrasion resistance, mechanical characteristics, and processability; a modified polymer obtained by the process; and a rubber composition using the modified polymer are provided. The process comprises a step of carrying out a modification reaction on the active end of a conjugated diene polymer having a vinyl content of below 10%, a cis-1,4 bond content of 75% or higher, and an active end, using an alkoxysilane compound, and a step of carrying out a condensation reaction in the presence of a condensation accelerator comprising a compound of an element belonging to at least one of the groups 4A (excluding Ti), 2B, 3B, and 5B of the periodic table.
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