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Process for producing polybutadiene rubber and rubber composition

A polybutadiene rubber, polybutadiene technology, used in tire sidewalls, passenger car tires, high-hardness composite rubber compositions, rubber compositions using the rubber, and rubber compositions for tread bases, In the field of tire internal components, it can solve problems such as increased heat generation, decreased durability and fatigue resistance

Inactive Publication Date: 2007-12-05
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in all these methods, there may be a case where heat generation becomes large when deformation is repeated, so that durability and fatigue resistance decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0196] (A) Preparation of vinyl-cis-polybutadiene:

[0197] In a reaction tank made of stainless steel equipped with a stirrer and having an internal volume of 1.5 L purged with nitrogen, 1.0 L of polymerization solution (butadiene: 31.5 wt%, 2-butene: 28.8 wt%, cyclohexane Alkane: 39.7wt%), and then add 1.7 millimoles of water, 2.9 millimoles of diethyl aluminum chloride, 0.3 millimoles of carbon disulfide, 13.0 millimoles of cyclooctadiene and 0.005 millimoles of cobalt octoate to it, The mixture was stirred at 40°C for 20 minutes to perform 1,4-cis-polymerization. At this time, a small amount of the cis-polybutadiene polymerization solution was taken out from the reaction tank and dried, and the viscosity of the obtained cis-polybutadiene rubber in the toluene solution was measured and found to be 175. Thereafter, 150 mL of butadiene, 1.1 mmol of water, 3.5 mmol of triethylaluminum chloride, and 0.04 mmol of cobalt octoate were added, and the mixture was stirred at 40°C for 20 ...

Embodiment 2-1

[0212] (A) Preparation of vinyl-cis-polybutadiene:

[0213] Into a reaction tank made of stainless steel with an internal volume of 1.5L and purged with nitrogen equipped with a stirrer, 1.0L of polymerization solution (butadiene: 31.5wt%, 2-butene: 28.8wt%, cyclohexane: 39.7 wt%), 1.7 mmoles of water, 2.9 mmoles of diethyl aluminum chloride, 0.3 mmoles of carbon disulfide, 13.0 mmoles of cyclooctadiene and 0.005 mmoles of cobalt octoate were then added, and the mixture was stirred at 40°C for 20 minutes, Thus, 1,4-cis-polymerization is performed. Thereafter, 150 mL of butadiene, 1.1 mmol of water, 3.5 mmol of triethylaluminum chloride, and 0.04 mmol of cobalt octoate were added, and the mixture was stirred at 40°C for 20 minutes to perform 1,2-syndiotacticity. polymerization. An ethanol solution of antioxidant is added to it. Thereafter, unreacted butadiene and 2-butene were removed by evaporation, thereby obtaining vinyl-cis-polybutadiene with an HI of 40.5%, and the yield was 6...

Embodiment 2-2

[0219] Except for using BR150L (manufactured by Ube Industries, Ltd.) as the cis-polybutadiene in (B), vinyl-cis-polybutadiene was obtained in the same manner as in Example 2-1. The ML of the polymer mixture was 68 and the HI was 11.9%.

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PUM

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Abstract

A process for producing a vinyl-cis-polybutadiene rubber, including mixing (A) vinyl-cis-polybutadiene obtained by (1) a step of adding a cis-1,4-polymerization catalyst obtainable from an organoaluminum compound and a soluble cobalt compound to a mixture containing 1,3-butadiene and a hydrocarbon-based organic solvent as the major components and having an adjusted water content, thereby subjecting the 1,3-butadiene to cis-1,4-polymerization and subsequently, (2) a step of making a catalyst obtainable from a soluble cobalt compound, an organoaluminum compound represented by the general formula, AlR3 (wherein R represents an alkyl group having from 1 to 6 carbon atoms, a phenyl group, or a cycloalkyl group), and carbon disulfide present in the resulting polymerization reaction mixture, thereby subjecting the 1,3-butadiene to 1,2-polymerization; and (B) cis-polybutadiene obtained by a step of adding the foregoing cis-1,4-polymerization catalyst, thereby subjecting the 1,3-butadiene to cis-1,4-polymerization and a rubber composition containing the resulting rubber.

Description

Technical field [0001] The invention relates to a method for preparing vinyl-cis-polybutadiene rubber, in particular to a method for preparing vinyl-cis-polybutadiene rubber with excellent extrusion processability, tensile stress, and resistance to flex crack growth The rubber is suitable for automobile tire components, especially tire sidewalls. The present invention also relates to a rubber composition using the rubber. [0002] The present invention also relates to a rubber composition made of vinyl-cis-polybutadiene rubber for tire sidewalls, which has small die expansion and excellent extrusion processability, and which can be improved in relation to its vulcanization The low fuel consumption. [0003] The present invention also relates to a silica-composite rubber composition suitable for tire cap treads, which has small die expansion and excellent extrusion processability, while maintaining excellent wet braking performance and exothermic Performance and wear resistance, su...

Claims

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Application Information

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IPC IPC(8): C08L9/00C08L53/00
Inventor 冈本尚美安部光春山下纯中岛哲司北村隆木村修和田隆
Owner UBE IND LTD
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