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Modified conjugated diene polymer composition, method for producing modified conjugated diene polymer composition, and tire

A conjugated diene, manufacturing method technology, applied in special tires, tire parts, transportation and packaging, etc., can solve problems such as insufficient reactivity, and achieve the effect of excellent wear resistance and excellent balance height

Active Publication Date: 2022-04-01
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, the rubber composition described in Patent Document 1 has the following problems: the reactivity between the modified group of the terminal-modified styrene-butadiene rubber and silica is insufficient, and the above-mentioned snow performance and wet road surface There is room for further improvement in terms of both performance improvements

Method used

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  • Modified conjugated diene polymer composition, method for producing modified conjugated diene polymer composition, and tire
  • Modified conjugated diene polymer composition, method for producing modified conjugated diene polymer composition, and tire
  • Modified conjugated diene polymer composition, method for producing modified conjugated diene polymer composition, and tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～20

[0524] [Modified Conjugated Diene Polymer Compositions (Examples 1-20, Comparative Examples 1-9)]

[0525] Modified conjugated diene polymers (samples 1 to 16), SBR·A, SBR·B, natural rubber (NR) and polybutadiene (BR) shown in Table 1 and Table 2 above were used as raw materials Rubber was kneaded by the following method using the materials shown below, and an unvulcanized rubber composition and a vulcanized rubber composition were produced.

[0526] Each formula is listed in Table 3~Table 5.

[0527] It should be noted that in Tables 3 to 5, the values ​​in parentheses indicate the amount of operating oil contained in the samples.

[0528] ・Modified conjugated diene polymer: samples 1 to 16

[0529] ・SBR・A (manufactured by Asahi Kasei Co., Ltd., Tufdene 4850, glass transition temperature: -12°C)

[0530] ・SBR・B (manufactured by Asahi Kasei Co., Ltd., Tufdene 1834, glass transition temperature: -70° C.)

[0531] NR (natural rubber, glass transition temperature: -70°C)

[...

Embodiment 1～13、15～20

[0544] (Examples 1-13, 15-20, Comparative Examples 1-9)

[0545] According to the formulations shown in Tables 3 to 5, kneading was carried out by the following method to obtain an unvulcanized rubber composition and a vulcanized rubber composition.

[0546] Using a kneader (inner volume 0.5 L) equipped with a temperature control device, as the first stage of kneading, according to the conditions of a filling rate of 65% and a rotor speed of 50 rpm, raw rubber, silica, silane coupling agent, and carbon black were used. , zinc white, stearic acid, wax and anti-aging agent, knead for 4 minutes. At this time, the discharge temperature was adjusted to 155 to 160° C. by temperature control of the kneader to obtain a compounded product.

[0547] Next, as the second stage of kneading, the compound obtained above was cooled to room temperature, and then kneaded for 3.5 minutes by the above-mentioned kneader. Also in this case, the discharge temperature was adjusted to 155 to 160° C....

Embodiment 14

[0553] In the first stage of kneading, after kneading sample 9 as a raw material rubber and silica at a rotor speed of 50 rpm for 1 minute, use sample 7 as a raw material rubber, silica, and a silane coupling agent , carbon black, zinc white, stearic acid, wax and anti-aging agent, knead for 4 minutes. At this time, the discharge temperature was adjusted to 155 to 160° C. by temperature control of the kneader to obtain a compounded product.

[0554] Next, as the second stage of kneading, the compound obtained above was cooled to room temperature, and then kneaded for 3.5 minutes by the above-mentioned kneader. Also in this case, the discharge temperature was adjusted to 155 to 160° C. by temperature control of the kneader. In addition, discharge temperature is controlled by measuring the temperature of each compound discharged from a kneader after kneading.

[0555] Furthermore, after cooling the compound obtained above to room temperature, the unvulcanized rubber compositio...

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Abstract

The present invention provides a modified conjugated diene polymer composition capable of obtaining a rubber composition having a high balance between snow performance and wet performance and excellent wear resistance. The modified conjugated diene polymer composition contains a rubber component A which is a modified conjugated diene polymer having a glass transition temperature of -35°C or higher, and a rubber component having a glass transition temperature of -55°C or lower B and the filler, with respect to the total amount of the above-mentioned rubber component A and the above-mentioned rubber component B, the above-mentioned rubber component A is not less than 50% by mass and not more than 95% by mass, and the weight average molecular weight of the above-mentioned rubber component A is 20×10 4 Above 300×10 4 Hereinafter, the molecular weight distribution Mw / Mn is not less than 1.6 and not more than 4.0, and the modification rate of the rubber component A is not less than 50% by mass.

Description

technical field [0001] The present invention relates to a modified conjugated diene polymer composition, a method for producing the modified conjugated diene polymer composition, and a tire. Background technique [0002] In recent years, winter tires have been required to improve the running performance on wet roads (wet performance) in addition to the running performance on snowy roads (snow performance). [0003] Furthermore, due to the social demand for reduction of the load on the global environment, there is an increasing demand for longer life of tires, and there is a strong demand for improvement in wear resistance of tire performance. [0004] Conventionally, in order to improve the performance on snow, methods such as reducing the amount of fillers added and increasing the amount of oil added have been proposed for the purpose of reducing the modulus of elasticity at low temperatures and ensuring high followability of tread rubber on snowy roads. [0005] However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L15/00C08L7/00C08L9/00C08L9/06C08L91/00C08L91/06C08K13/02C08K3/36C08K3/04C08K5/09C08K5/18C08K5/47B60C1/00
CPCC08L15/00B60C1/0016C08L2205/025C08L2205/035C08L91/00C08L91/06C08K13/02C08K3/36C08K3/04C08K5/09C08K5/18C08K5/47C08L7/00C08L9/00C08L9/06B60C1/00C08L101/12C08L2207/322
Inventor 角谷省吾
Owner ASAHI KASEI KK
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