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Branched conjugated diene-aromatic vinyl copolymer and method for producing same

A technology of aromatic vinyl and chain-like conjugated diene, which is applied in the field of branched-chain conjugated diene-aromatic vinyl copolymer and its manufacturing, and can solve problems such as narrow molecular weight distribution, increased viscosity, and increased energy consumption. problems, to achieve the effects of excellent balance, excellent productivity, low hysteresis loss and excellent wet skid resistance

Active Publication Date: 2012-02-22
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, it also has the following disadvantages: the molecular weight distribution is narrow, the viscosity increases during mixing due to the combination of the modified group and the filler such as silica, so the processability is poor, and each batch needs to be heated and cooled during polymerization. , thus increasing energy consumption
However, solution-polymerized SBR (S-SBR) has the disadvantages of high energy consumption and poor processability in compound kneading when producing a composition, compared with emulsion-polymerized SBR (E-SBR), which produces a large number of branched chains during polymerization.

Method used

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  • Branched conjugated diene-aromatic vinyl copolymer and method for producing same
  • Branched conjugated diene-aromatic vinyl copolymer and method for producing same
  • Branched conjugated diene-aromatic vinyl copolymer and method for producing same

Examples

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Embodiment 1

[0194] Two autoclaves are connected in series, the internal volume of the autoclave is 10L, the ratio (L / D) of the height (L) to the diameter (D) of the inside is 4, the bottom has an inlet, the top has an outlet, and a stirrer and Jacket for temperature regulation, the first autoclave was used as the polymerization reactor and the second autoclave was used as the coupling reactor.

[0195] 23.8 g / min of 1,3-butadiene, 11.9 g / min of styrene, and 187.5 g / min of n-hexane from which impurities such as moisture were removed were mixed to prepare a mixed solution. With the obtained mixed solution, n-butyllithium for impurity inertization treatment (n-butyllithium treatment) was mixed at an addition rate of 0.100 mmol / min using a static mixer. The mixed solution was continuously supplied to the bottom of the first polymerization reactor, while 2,2-di(2-tetrahydrofuryl)propane as a polar substance was added at a rate of 0.014 g / min, and as a polymerization initiator The n-butyllithi...

Embodiment 2、3

[0202] Under the conditions shown in Table 1, n-butyllithium, 2,2-bis(2-tetrahydrofuryl)propane and tetraglycidyl-1,3-bisaminomethylcyclohexane were used as polymerization initiators. Other conditions were the same as in Example 1 to obtain oil-extended copolymers (sample b, c). The properties of the obtained copolymers are listed in Table 1.

Embodiment 4

[0204] As shown in Table 2, in the method of embodiment 1, do not change the amount ratio of 1,3-butadiene and styrene, change the supply rate of monomer, make the average residence time be 25 minutes, the interior of reactor outlet The temperature was 105° C., and the supply amounts of other substances were also changed as shown in Table 1 to perform polymerization and coupling reactions. Thereafter, addition of oil and solvent removal were carried out in the same manner as in Example 1 to obtain an oil-extended copolymer (sample d). The properties of the obtained copolymers are listed in Table 2.

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Abstract

A branched conjugated diene-aromatic vinyl copolymer (C) being a random copolymer, wherein the aromatic vinyl bond content in the conjugated diene-aromatic vinyl copolymer (C) is from 30 to 38 mass%, the vinyl bond content in the total bond units of the conjugated diene is from 30 to 43 mol%, the weight average molecular weight (Mw-C) in terms of polystyrene obtained by gel permeation chromatography (GPC) of the conjugated diene-aromatic vinyl copolymer (C) is from 700,000 to 1,000,000, the ratio of the weight average molecular weight (Mw-C) to the number average molecular weight (Mn-C) ((Mw-C) / (Mn-C)) is from 1.7 to 3.0, and the Mooney viscosity (ML-C) and the Mooney relaxation ratio (MSR-C) measured at 120 DEG C satisfy the relationship represented by formula (1): {214-(ML-C)} / 300 = (MSR-C) = {260-(ML-C)} / 300 (wherein 100 = (ML-C) = 140).

Description

technical field [0001] The present invention relates to a branched conjugated diene-aromatic vinyl copolymer and a method for producing the same. Background technique [0002] From the viewpoint of ensuring safety, it is very important to use materials for automobile tires that are excellent in wet skid resistance and have practically sufficient wear resistance and destructive properties. On the other hand, in recent years, environmental considerations such as the reduction of carbon dioxide emissions have been demanded by society, and the demand for lower fuel consumption of automobiles has gradually increased. Under such circumstances, development of materials with low rolling resistance has been demanded as materials for automotive tires, particularly tire treads that come into contact with the ground. [0003] In addition, from the perspective of the life cycle of tires, attention has been paid to reducing energy consumption in the manufacturing process. In particular, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/00C08F8/00C08F236/10
CPCC08C19/44C08F36/04C08C19/00C08F236/10C08K3/00C08L53/02
Inventor 吉田淳一
Owner ASAHI KASEI KK
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