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Modified butadiene polymer composition

A polymer and composition technology, applied in the direction of rolling resistance optimization, road transportation emission reduction, etc., can solve the problems of active end deactivation, easy reduction of active lithium end residual ratio, difficulty in modification rate, etc., to achieve gripping performance and Excellent wear resistance and good workability

Inactive Publication Date: 2008-04-02
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anionic polymerization using organolithium catalysts has the problem that trace impurities in the raw material monomers, especially water, acetylenes, allenes, etc., react with the active lithium end of the polymer to deactivate the active end.
Therefore, there is a problem that when the molecular weight becomes higher, the residual ratio of active lithium terminals at the completion of polymerization tends to decrease
However, no effective countermeasures have been taken to solve the problem that the active lithium end causes a self-decomposition reaction to generate lithium hydride and eliminate the end.
At present, it is still difficult to achieve both molecular weight increase and high modification rate

Method used

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  • Modified butadiene polymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Two polymerization reactors each having an internal volume of 10 liters, having a bottom inlet and a top outlet and equipped with a stirrer and a jacket for temperature regulation were connected, and a static mixer was connected downstream of the second reactor outlet . After mixing 16.38 g / min of butadiene (B1), 8.82 g / min of styrene (S1) and 132.3 g / min of n-hexane shown in Table 1, the resulting mixed solution was passed through a dehydration tower filled with activated alumina, It was further mixed with n-butyllithium at a rate of 0.00378 g / min (0.0591 mmol) in a static mixer immediately before entering the reactor to remove impurities and fed continuously to the bottom of the first reactor. In addition, 2,2-bis(2-oxolanyl)propane as a polar substance was added at a rate of 0.015 g / min and n-butyllithium as a polymerization initiator at a rate of 0.00504 g / min (0.0788 mmol). The rate is added to the bottom of the reactor. The internal temperature of the reactor wa...

Embodiment 2-12

[0120] Polymerization and modification are carried out in the same manner as in Example 1, except that the amount of 2,2-bis(2-oxolanyl)propane, the amount of n-butyllithium as a polymerization initiator, The amount of tetraglycidyl-1,3-bisaminomethylcyclohexane, the kind of butadiene, the polymerization temperature and the modification temperature were changed to the conditions shown in Table 2. The analytical values ​​of the obtained modified copolymer (B-K) are shown in Table 2. The molecular weight distribution is unimodal.

[0121] In Example 4, instead of the aromatic oil (X-140), a mixed product of RAE and paraffin oil (Process NC-140, trade name) manufactured by Japan Enaji Co., Ltd. was used.

Embodiment 13-19 and comparative example 15-20

[0135] Rubber compounds using the samples shown in Tables 2 and 3 as raw rubber were obtained by the following kneading method according to the formulation shown in Table 4.

[0136] [kneading method]

[0137] In a Banbury-type closed kneader (inner volume: 1.7 liters) equipped with a temperature control device using external circulating water, the raw material rubber, fillers (silica and carbon black), organosilane coupling agent, and Aromatic oil, zinc white, and stearic acid were kneaded as the first-stage kneading under the conditions of a filling rate of 65% and a rotor speed of 66 / 77 rpm. After the resulting compound was cooled to room temperature, an antiaging agent was added thereto, and the compound was kneaded again as a second-stage kneading to improve dispersion of silica. Also, in this case, the discharge temperature is regulated by the temperature of the mixer.

[0138]After cooling, the sulfur and the vulcanization accelerator were kneaded in an open roll set ...

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Abstract

An object of the present invention is to improve, in the raw material rubber compound particularly using a silica-based filler, which is used for tire tread, the balance between the rolling resistance and the skid resistance on a wet road surface and at the same time, improve the wear resistance is enhanced. The present invention provides an oil-extended polymer composition comprising 100 parts by weight of (A) a polymer having a number average molecular weight Mn of 500,000 to 700,000 and a content of a functional group-containing polymer component to be adsorbed to silica of 50 wt% or more, and from 20 to 60 parts by weight of (B) an extender oil.

Description

technical field [0001] The present invention relates to an oil-extended rubber composition comprising a specific modified butadiene-based polymer. More specifically, the present invention relates to an oil-extended rubber composition comprising a modified butadiene-based polymer having a high molecular weight and a high percentage of a butadiene-based polymer, the butadiene-based polymer Has a modifying component effective for silica-based fillers. [0002] The modified butadiene polymer composition of the present invention is suitable for common applications of butadiene polymer rubber, mainly tires, or other industrial products. Background technique [0003] In recent years, with increasing attention to environmental issues, there has been an increasing demand to reduce the amount of carbon dioxide gas emitted from automobiles. In order to meet such demands, it is also required to reduce rolling resistance in terms of tire performance. In terms of tire performance, roll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08F2/06C08F4/48C08F8/00
CPCC08K5/01C08K3/36C08C19/44Y02T10/86C08L15/00C08L19/006C08F2/06C08F4/48C08F8/00
Inventor 山田春夫松田孝昭北川裕一
Owner ASAHI KASEI CHEM CORP
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