Modified conjugated diene polymer and method for producing the same

A conjugated diene and a manufacturing method technology, applied in the field of modified conjugated diene-based polymers, can solve the problems of poor processability and the like

Active Publication Date: 2009-07-29
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the compositions composed of these modified polymers blended with carbon black and silica improve hysteresis loss and abrasion resistance without impairing wet skid performance, their processability tends to deteriorate.

Method used

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  • Modified conjugated diene polymer and method for producing the same
  • Modified conjugated diene polymer and method for producing the same
  • Modified conjugated diene polymer and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0211] An autoclave having a stirrer and a jacket and capable of temperature control with an inner volume of 10 liters was used as a reactor. 625g of butadiene, 225g of styrene, 5500g of cyclohexane, and 0.82g of 2,2-bis(2-tetrahydrofuryl)propane as polar substances were added to the above-mentioned reactor, and the reactor was filled with The temperature was kept at 30°C. A cyclohexane solution containing 6.75 mmol of n-butyl lithium was supplied as a polymerization initiator into the reactor. After the reaction started, the exothermic heat generated by the polymerization started to raise the temperature in the reactor. 7 minutes to 12 minutes after the addition of the polymerization initiator, 50 g of butadiene was additionally supplied at a rate of 10 g / min. As a result, the temperature in the final reactor reached 77°C. After the polymerization reaction was terminated, 13.5 mmol of 1-[3-(triethoxysilyl)-propyl]-4-methylpiperazine was added to the reactor, and stirred at...

Embodiment 2

[0214] Use N-[2-(trimethoxysilyl)-ethyl]-N,N',N'-trimethylethane-1,2-diamine instead of 1-[3-(triethoxy A styrene-butadiene copolymer (sample B) having a modified component was obtained in the same manner as in Example 1 except that silyl)-propyl]-4-methylpiperazine.

[0215] (Sample B) was analyzed, and the results were as follows: the amount of bound styrene was 25% by weight, the amount of bound butadiene was 75% by weight, and the Mooney viscosity of the polymer was 54. The 1,2-bonding amount in the microstructure of the butadiene part is 60%, the polystyrene-equivalent molecular weight has a weight average molecular weight (Mw) of 390,000, a number average molecular weight (Mn) of 280,000, and a molecular weight distribution (Mw / Mn) was 1.39. In addition, the modification rate was 78%.

Embodiment 3

[0217] Using 2-(trimethoxysilyl)-1,3-dimethylimidazolidine instead of 1-[3-(triethoxysilyl)-propyl]-4-methylpiperazine, except Except for this, a styrene-butadiene copolymer (sample C) having a modified component was obtained in the same manner as in Example 1.

[0218] (Sample C) was analyzed, and the results were as follows: the amount of bound styrene was 25% by weight, the amount of bound butadiene was 75% by weight, and the Mooney viscosity of the polymer was 52. The 1,2-bonding amount in the microstructure of the butadiene part is 61%, and the polystyrene-equivalent molecular weight has a weight average molecular weight (Mw) of 370,000, a number average molecular weight (Mn) of 270,000, and a molecular weight distribution (Mw / Mn) was 1.37. In addition, the modification rate was 80%.

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Abstract

Disclosed is a modified conjugated diene polymer wherein a modifying group derived from a low molecular weight compound having two or more tertiary amino groups and one or more alkoxysilyl groups in a molecule is bonded to a conjugated diene polymer obtained by polymerizing a conjugated diene compound or to a conjugated diene polymer obtained by copolymerizing a conjugated diene compound and an aromatic vinyl compound. Also disclosed is a method for producing the modified conjugated diene polymer which is characterized in that after polymerizing a conjugated diene compound or copolymerizing a conjugated diene compound and an aromatic vinyl compound in a hydrocarbon solvent using an alkali metal initiator and/or an alkaline earth metal initiator, an active end of the thus-obtained polymer is reacted with a low molecular weight compound having two or more tertiary amino groups and one or more alkoxysilyl groups in a molecule.

Description

technical field [0001] The present invention relates to a modified conjugated diene polymer, a method for producing the polymer, and a composition using the polymer. More specifically, the present invention relates to a modified conjugated diene polymer having a modifying group in the molecule, a method for producing the modified polymer, a composition using the modified polymer, and a compound containing the modified Tires of polymer compositions. Background technique [0002] With the recent demand for reducing fuel consumption of automobiles, a conjugated diene-based polymer that has low rolling resistance, excellent wear resistance, and excellent destructive properties, as well as wet skid performance, is expected as a raw material rubber for tires. handling stability. [0003] In order to reduce the rolling resistance of the tire, the hysteresis loss of the vulcanized rubber can be reduced. The rebound performance at 50 to 80° C., tan δ at 50 to 80° C., Goodrich heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/42C08F36/04
CPCC08C19/44C08F8/42C08C19/22C08C19/25C08F236/10C08L15/00C08F36/04
Inventor 福冈亮子山田春夫石村德房
Owner ASAHI KASEI KK
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