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Hydrogenated block copolymer and composition containing same

A technology of block copolymers and hydrogenated blocks, which is applied in the field of thermoplastic elastomer compositions and hydrogenated block copolymers to achieve excellent weather resistance

Active Publication Date: 2011-07-27
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the block copolymer disclosed in Patent Document 5 or 6 still has room for improvement in compression set when it is mixed with a paraffin-based process oil or the like to form a composition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] The present invention will be further specifically described below through examples, and the present invention is not limited by these examples. In the following examples and comparative examples, the physical properties of the hydrogenated block copolymer and the thermoplastic elastomer composition were evaluated by the following methods.

[0072] (1) Hydrogenation rate, styrene content, vinyl bond amount

[0073] Depend on 1 H-NMR spectrum calculation.

[0074] Device: JNM-Lambda 500 (manufactured by JEOL Ltd.)

[0075] Solvent: deuterated chloroform

[0076] Measurement temperature: 50°C.

[0077] (2) Weight average molecular weight (Mw), molecular weight distribution (Mw / Mn)

[0078] The weight-average molecular weight (Mw) and the number-average Molecular weight (Mn) and molecular weight distribution (Mw / Mn). The weight-average molecular weight (Mw) and the number-average molecular weight (Mn) of the polymer produced by the coupling reaction and the uncoupli...

reference example 1

[0101] (1) Add 3400 ml of cyclohexane as a solvent and 5.9 ml of 10.5%wt sec-butyllithium as an initiator in a pressure vessel that has been replaced with nitrogen and dried, heat up to 50°C, and then add 126 ml A mixture of isoprene and butadiene with a mass ratio of 50 / 50, polymerized for 2 hours. Then add 206 ml of styrene, carry out polymerization for 1 hour, further add 306 ml of a mixture of isoprene and butadiene mass ratio = 50 / 50, carry out polymerization for 2 hours, then raise the temperature to 70 ° C, and then add 6.12 g of ortho-benzene A 5%wt tetrahydrofuran (THF) solution of dimethyl diformate was used for a coupling reaction for 3 hours, and then 0.25 ml of methanol was added to terminate the polymerization to obtain a polymerization reaction solution containing a block copolymer. Polymer segment B of the resulting block copolymer 1 mass relative to B 1 and B 2 The ratio of the total mass (B 1 Diene mass ratio, hereinafter marked as B 1 / (B 1 +B 2 )) is...

reference example 2

[0104] (1) Add 3400 ml of cyclohexane as a solvent and 7.9 ml of 10.5%wt sec-butyllithium as an initiator in a pressure vessel that has been replaced with nitrogen and dried, heat up to 50°C, and then add 136 ml A mixture of isoprene and butadiene with a mass ratio of 50 / 50, polymerized for 2 hours. Then add 223 ml of styrene, carry out polymerization for 1 hour, further add 330 ml of a mixture of isoprene and butadiene mass ratio = 50 / 50, carry out polymerization for 2 hours, then raise the temperature to 70 ° C, and then add 8.52 g of ortho-benzene A 5%wt THF solution of dimethyl diformate was used for a coupling reaction for 3 hours, and then 0.35 ml of methanol was added to terminate the polymerization to obtain a polymerization reaction solution containing a block copolymer. B of the resulting block copolymer 1 / (B 1 +B 2 )) is 0.29.

[0105] (2) 25.3 g of palladium-on-carbon (palladium loading: 5% by mass) was added as a hydrogenation catalyst to the reaction mixture...

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PUM

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Abstract

The present invention provides a thermoplastic elastomer composition having excellent fluidity, compression set and flexibility, and a block copolymer which provides the thermoplastic elastomer composition. Specifically disclosed is a hydrogenated block copolymer obtained by hydrogenating a block copolymer which is obtained by reacting a living polymer represented by formula (1): B1-A-B2-X (wherein B1 and B2 each represents a polymer block mainly composed of a structural unit derived from a conjugated diene compound; A represents a polymer block mainly composed of a structural unit derived from a vinyl aromatic compound; and X represents an active end of the living anionic polymer) with a coupling agent. The mass of the polymer block B1 before the hydrogenation reaction relative to the total mass of the polymer blocks B1 and B2 is within the range of 0.10-0.45, and the contained amount of the structural unit derived from a vinyl aromatic compound relative to the mass of the hydrogenated block copolymer is within the range of 25-50% by mass.

Description

technical field [0001] The present invention relates to a hydrogenated block copolymer and a thermoplastic elastomer composition containing the hydrogenated block copolymer. According to the present invention, a thermoplastic elastomer composition excellent in fluidity, compression set, flexibility, and weather resistance is provided. Background technique [0002] Styrene-based thermoplastic elastomers have excellent mechanical strength, flexibility, weather resistance, ozone resistance, thermal stability, and transparency when made into compositions, so they can be molded into various cushioning materials, shock-absorbing materials, and sealing materials , handles, adhesives, toys, etc. Among the above-mentioned thermoplastic elastomer compositions, especially in applications where the pads of beds or chairs or insoles come into direct or indirect contact with the human body, it is required to have high flexibility due to cushioning and productivity in practical use. And ...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08L53/02
CPCC08F8/04C08L53/025C08L91/00C08F297/044C08L2666/24
Inventor 城后洋祐西川崇明森口信弘
Owner KURARAY CO LTD
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