Hydrogenated diene polymer, gum, rubber composition and tire

By controlling the degree of branching and the proportion of structural units in the hydrogenated diene polymer, hydrogenated diene polymers with a branching degree of 1.5 or higher and a hydrogenation rate of 40-85% were prepared. This solved the problem of poor processability, improved the low-temperature performance, abrasion resistance, and tensile strength of the rubber composition, and enhanced the dispersibility and low oil consumption of silica-based fillers.

CN116457218BActive Publication Date: 2026-07-24ASAHI KASEI KOGYO KABUSHIKI KAISHA
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Patent Information

Application Number
CN202180075798.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-12-08
Filing Date
2021-10-26
Publication Date
2026-07-24
Estimated Expiration
2041-10-26

AI Technical Summary

Technical Problem

In the prior art, hydrogenated diene polymers used in rubber compositions have poor processability, which leads to reduced dispersibility of silica-based fillers, affecting low oil consumption and tensile strength.

Method used

By controlling the degree of branching, the ratio of structural units, and the hydrogenation rate of the hydrogenated diene polymer within a specific range, a hydrogenated diene polymer with a branching degree of 1.5 or higher and a hydrogenation rate of 40-85% is prepared. This polymer contains a specific ratio of structural units, avoids aromatic vinyl monomer units, and combines with silica-based inorganic fillers to form a rubber composition.

Benefits of technology

This study improved the low-temperature performance, abrasion resistance, and tensile strength of the rubber composition, avoided the problem of poor processability, and improved the dispersibility and low oil consumption of silica-based fillers.

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Abstract

Provided is a hydrogenated diene polymer in which the branching degree (Bn) obtained by GPC-light scattering measurement with a viscosity detector is 1.5 or greater, the composition ratio (mol%) of a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), a structural unit represented by the following formula (3), and a structural unit represented by the following formula (4) is set to a, b, c, and d in this order, respectively, the following mathematical formula (S) is satisfied, and the hydrogenation rate is 40 to 85%. Mathematical formula (S): 10 ≦ [(a+b) / (a+b+c+d)] × 100 ≦ 70
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