RUBBER COMPOSITION AND TIRE USING THE SAME AS WELL AS MODIFIED CONJUGATED DIENE-BASED POLYMER AND METHOD FOR PRODUCING THE SAME

摘要

This invention relates to a rubber composition being excellent in the low heat buildup and fracture properties (resistance to crack growth). and more particularly to a rubber composition, characterized by compounding 10-100 parts by mass of an inorganic filler and/or carbon black based on 100 parts by mass of a rubber component including not less than 10 mass % of a modified conjugated diene-based polymer having a cis-1,4 bond content of not less than 90% and a vinyl bond content of not more than 1.2% and a primary amino group. In this case, the modified conjugated diene-based polymer is obtained by (1) reacting the predetermined conjugated diene-based polymer having an active terminal with a compound having two or more predetermined functional groups and (2) further reacting the resulting product with a compound having a primary amino group.

主权项

1. A method of producing a modified conjugated diene-based polymer, characterized by comprising:
(1) a step of reacting a conjugated diene-based polymer having a cis-1,4 bond content of not less than 90% and a vinyl bond content of not more than 1.2% and an active terminal with a compound X having a functional group A indicating a reactivity to the active terminal and at least one reactive functional group B (provided that the functional group A and the functional group B may be same) to obtain a primary modified conjugated diene-based polymer; and (2) a step of reacting the primary modified conjugated diene-based polymer with a compound Y having a functional group C indicating a reactivity to the reactive functional group B and at least one primary amino group or protected primary amino group (provided that the functional group C may be the primary amino group or the protected primary amino group) to obtain a secondary modified conjugated diene-based polymer.