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Modified diene rubber and rubber composition containing the same

A diene-based rubber and modification technology, applied in tire tread/tread pattern, tire parts, transportation and packaging, etc., can solve the problems of reduced reaction efficiency, reduced import rate, high load, and improved dispersion. , Excellent heat dissipation effect

Inactive Publication Date: 2009-07-15
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such solvents have a high load on the environment
Furthermore, the reaction efficiency of the solvent system is lower than that of the non-solvent system, the introduction rate of the TEMPO site in the first-stage reaction is lowered, and the introduction rate of the functional group by the second-stage grafting reaction starting from this site is also lowered. And other issues

Method used

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  • Modified diene rubber and rubber composition containing the same
  • Modified diene rubber and rubber composition containing the same
  • Modified diene rubber and rubber composition containing the same

Examples

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Effect test

manufacture example 1

[0097] Manufacturing Example 1: Manufacturing of DHK-2F

[0098] 350 g (5.14 moles) of synthetic polyisoprene rubber (NipolIR2200 manufactured by Nippon Zeon Co., Ltd.), 8.86 g (0.0514 moles) of hydroxyl TEMPO (OH-TEMPO) (manufactured by NOF Corporation) and 0.378 g (produced by decomposition) The molecular conversion of free radicals is 5.16×10 -3 mole, the mole number and mole % of the following free radical initiators are all expressed in this way) di-tert-butyl peroxide (manufactured by NOF Co., Ltd.) パブブル D, in a 600cc airtight container with a temperature set at 60°C Mix and disperse in a type mixer for 5 minutes (pre-mix). This premixed rubber was kneaded for 10 minutes under a nitrogen atmosphere in an internal kneader set at a temperature of 100° C. and discharged. The temperature at the end of mixing was 185°C. A part of the sample was taken from the rubber, and the sample was dissolved in toluene in order to remove hydroxyl TEMPO not bonded to rubber molecules a...

manufacture example 2

[0100] Manufacturing Example 2: Manufacturing of DHK-3F

[0101] Make 350g (5.14 moles) of the above-mentioned synthetic polyisoprene rubber, 8.86g (0.0514 moles) of the above-mentioned hydroxyl TEMPO and 0.184g (2.517×10 -3 mol) the above-mentioned di-tert-butyl peroxide was mixed and dispersed for 5 minutes in a 600 cc closed mixer set at a temperature of 60° C. (pre-mixing). This premixed rubber was kneaded for 10 minutes under a nitrogen atmosphere in an internal kneader set at a temperature of 100° C. and discharged. The temperature at the end of mixing was 185°C. A part of the sample was taken from the rubber, and the sample was dissolved in toluene in order to remove hydroxyl TEMPO not bonded to rubber molecules and peroxide residues, and then dropped into methanol to solidify and recover. This operation was performed 3 times, and then 1H-NMR measurement was performed to calculate the grafted hydroxyl group TEMPO amount. The introduction rate of hydroxyl TEMPO was ...

manufacture example 3

[0103] Manufacturing Example 3: Manufacturing of DHK-4F

[0104] Make 350g (5.14 moles) of the above-mentioned synthetic polyisoprene rubber, 8.86g (0.0514 moles) of the above-mentioned hydroxyl TEMPO and 0.213g (2.517×10 -3 mol) bis(2-tert-butylperoxyisopropyl) benzene (Parbull P manufactured by NOF Co., Ltd.), was mixed and dispersed for 5 minutes in a 600cc closed mixer with a temperature setting of 60°C ( premixed). This premixed rubber was kneaded for 10 minutes under a nitrogen atmosphere in an internal kneader set at a temperature of 100° C. and discharged. The temperature at the end of mixing was 185°C. A part of the sample was taken from the rubber, and the sample was dissolved in toluene in order to remove hydroxyl TEMPO not bonded to rubber molecules and peroxide residues, and then dropped into methanol to solidify and recover. This operation was performed 3 times, and then 1H-NMR measurement was performed to calculate the grafted hydroxyl group TEMPO amount. ...

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Abstract

A diene rubber is modified for increasing the dispersibility of silica and improving wear resistance and resistance to heat generation. Specifically disclosed is a modified diene rubber which is obtained by adding a compound (B) having a nitroxide free radical, which is stable at room temperature in the presence of oxygen, in the molecule, a radical initiator (C) and a radically polymerizable monomer (D) having a functional group in the molecule to a diene rubber (A), and then reacting the resulting mixture. Also specifically disclosed are a rubber composition containing the modified diene rubber, and a pneumatic tire.

Description

technical field [0001] The present invention relates to modified diene rubber, and more specifically relates to adding a compound having a stable nitroxide free radical in the molecule at room temperature and in the presence of oxygen, a free radical initiator and a free radical polymerizable compound to the diene rubber. monomer, and react in a non-solvent system so that the diene rubber is graft-modified by a radically polymerizable monomer, and relates to a rubber composition containing the rubber, and A pneumatic tire using the rubber or rubber composition. Background technique [0002] In recent years, reduction of rolling resistance of automobile tires has been strongly demanded from the viewpoint of environmental protection. In order to reduce the rolling resistance of automobile tires, it is required to reduce the tan δ of the tread rubber material of the tire in a high temperature region (for example, tan δ at 60° C. when measured at 20 Hz). In response to such a ...

Claims

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Application Information

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IPC IPC(8): C08C19/28B60C1/00B60C11/00C08F279/02
Inventor 川面哲司芦浦诚
Owner YOKOHAMA RUBBER CO LTD
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