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Process for producing polybutadiene rubber and rubber composition

A kind of polybutadiene rubber, polybutadiene technology, applied in tire sidewall, rubber composition using said rubber, rubber composition of tread base, passenger car tire, tread cap rubber, tire Internal components, in the field of high-hardness compound rubber compositions, can solve the problems of reduced durability and fatigue resistance, and increased heat generation.

Inactive Publication Date: 2011-03-23
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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  • Process for producing polybutadiene rubber and rubber composition
  • Process for producing polybutadiene rubber and rubber composition
  • Process for producing polybutadiene rubber and rubber composition

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 with an internal volume of 1.5 L equipped with a stirrer and purged with nitrogen, 1.0 L of a polymerization solution (butadiene: 31.5 wt %, 2-butene: 28.8 wt %, cyclohexyl alkane: 39.7wt%), then 1.7 mmol of water, 2.9 mmol of diethylaluminum chloride, 0.3 mmol of carbon disulfide, 13.0 mmol of cyclooctadiene and 0.005 mmol of cobalt octoate were added thereto, And the mixture was stirred at 40°C for 20 minutes, thereby performing 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 minutes...

Embodiment 2-1

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

[0213] In a reaction tank made of stainless steel with an internal volume of 1.5 L equipped with a stirrer and purged with nitrogen, 1.0 L of a polymerization solution (butadiene: 31.5 wt%, 2-butene: 28.8 wt%, cyclohexane: 39.7 wt%) was added. wt%), then add 1.7 mmoles of water, 2.9 mmoles of diethylaluminum chloride, 0.3 mmoles of carbon disulfide, 13.0 mmoles of cyclooctadiene and 0.005 mmoles of cobalt octanoate, and stir the mixture at 40° C. for 20 minutes, 1,4-cis-polymerization thus proceeds. 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 undergo 1,2-syndiotactic polymerization. An ethanol solution of an antioxidant was added thereto. Thereafter, unreacted butadiene and 2-butene were removed by evaporation to obtain vinyl-cis-polybutadiene with HI of 40.5% in a yield of 66 g....

Embodiment 2-2

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

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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 flex crack growth resistance , the rubber is suitable for automobile tire components, especially tire sidewalls, and 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 swell and excellent extrusion processability, and which can improve its vulcanization. low fuel consumption. [0003] The present invention also relates to a silica-complexed rubber composition suitable for tire cap treads, which has low die swell and excellent extrusion processability while maintaining excellent wet braking performance, heat release Performance and wear resistance, such as the required tire pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L53/00C08L9/00
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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