Thermoplastic elastomer composition, and molded article made from the composition
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KURARAY PLAST CO LTD
- Filing Date
- 2022-07-15
- Publication Date
- 2026-06-17
AI Technical Summary
【0007】 本発明によれば、制振性、復元性および耐熱性に優れ、適当な硬度を有する熱可塑性エラストマー組成物を提供することができる。
Smart Images
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Abstract
Claims
1. (a) Thermoplastic elastomer, (b) Polyphenylene ether resin, and (c) Rubber softener A thermoplastic elastomer composition comprising, Thermoplastic elastomer (a) comprises thermoplastic elastomer (a1) and thermoplastic elastomer (a2) in a mass ratio of 90:10 to 45:
55. The thermoplastic elastomer (a1) is a block copolymer consisting of a polymer block (X1) composed of structural units derived from an aromatic vinyl compound and a polymer block (Y1) composed of structural units derived from a conjugated diene compound, having a weight-average molecular weight greater than 150,000 and less than or equal to 500,000, and the content of structural units derived from the aromatic vinyl compound in the thermoplastic elastomer (a1) is 10% by mass or more based on the total structural units constituting the thermoplastic elastomer (a1). The thermoplastic elastomer (a2) is a block copolymer consisting of a polymer block (X2) composed of structural units derived from an aromatic vinyl compound and a polymer block (Y2) composed of structural units derived from a conjugated diene compound, having a weight-average molecular weight of 50,000 or more and 150,000 or less, the content of structural units derived from the aromatic vinyl compound in the thermoplastic elastomer (a2) being 2% by mass or more based on the total structural units constituting the thermoplastic elastomer (a2), the total content of 1,2-bonding units and 3,4-bonding units derived from the conjugated diene compound in the thermoplastic elastomer (a2) being 50 mol% or more based on the total structural units derived from the conjugated diene compound, and the hydrogenation rate of the polymer block (Y2) of the thermoplastic elastomer (a2) being 20% or less. In the transmission electron microscope image of the thermoplastic elastomer composition, the maximum major axis of the polyphenylene ether resin (b) dispersed in the matrix phase containing the thermoplastic elastomer (a) is 2 μm or less. A thermoplastic elastomer composition in which three 2 mm thick test pieces obtained by injection molding the aforementioned thermoplastic elastomer composition at 230°C are stacked, and the hardness obtained after 3 seconds using a Type A durometer in accordance with JIS K 6253 is 80 or less.
2. The composition according to claim 1, wherein the hydrogenation rate of the polymer block (Y2) of the thermoplastic elastomer (a2) is 0%.
3. The composition according to claim 1, wherein the thermoplastic elastomer (a2) has an order-to-disorder transition temperature of 280°C or lower.
4. The composition according to claim 1, comprising 100 parts by mass of thermoplastic elastomer (a), 5 to 100 parts by mass of polyphenylene ether resin (b), and 50 to 300 parts by mass of rubber softener (c).
5. The composition according to claim 1, further comprising polypropylene (d).
6. The composition according to claim 1, further comprising an inorganic filler (e).
7. The composition according to claim 1, wherein, in accordance with JIS K 6262:2013, the compression set after holding a 25% compression deformation at 70°C for 22 hours is 50% or less.
8. A molded article comprising the composition described in claim 1.