POLYMER COMPOSITION AND MOLDED ARTICLE
To provide a polymer composition having more excellent transparency and moldability than conventional 4-methyl-1-pentene-based polymer compositions while possessing properties such as excellent heat resistance possessed by conventional 4-methyl-1-pentene-based polymers.SOLUTION: There is provided a...
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Zusammenfassung: | To provide a polymer composition having more excellent transparency and moldability than conventional 4-methyl-1-pentene-based polymer compositions while possessing properties such as excellent heat resistance possessed by conventional 4-methyl-1-pentene-based polymers.SOLUTION: There is provided a polymer composition which comprises a 4-methyl-1-pentene-based polymer and satisfies the following requirements (X-1) to (X-3). Requirement (X-1): There are two or more melting peaks in the endothermic curve measured by DSC in accordance with JIS K7122 using a composition in a pellet form. Requirement (X-2): The melting enthalpy ΔH1 obtained from the peak area of the melting peak having the highest peak temperature of the melting peaks in the endothermic curve is less than 20.0 J/g. Requirement (X-3): The semi-crystallization time at 215°C measured by DSC by the following measurement method using a composition in a pellet form exceeds 800 seconds or is not observed. Measurement method: Using DSC-8500 manufactured by Perkin Elmer Co., Ltd., the semi-crystallization time at 215°C was measured when the temperature is increased from 30°C to 280°C at a temperature raising rate of 500°C/minute, held at the temperature for 10 minutes and then decreased to 215°C at a temperature-dropping rate of 500°C/minute.SELECTED DRAWING: None
【課題】従来の4-メチル-1-ペンテン系重合体が有する優れた耐熱性などの物性を備えながら、従来の4-メチル-1-ペンテン系重合体組成物よりも優れた透明性と成形性とを有する重合体組成物を提供する。【解決手段】要件(X-1)~(X-3)を満たし、4-メチル-1-ペンテン系重合体を含む重合体組成物(X)。要件(X-1):ペレット形状の組成物を用いて、JIS K7122に準拠してDSCで測定した吸熱曲線に2つ以上の融解ピークがある。要件(X-2):前記吸熱曲線の融解ピークのうち、ピーク温度が最も高い融解ピークのピーク面積から得られる融解エンタルピーΔH1が20.0J/g未満である。要件(X-3):ペレット形状の組成物を用いて、DSCにより下記の測定方法で測定した215℃での半結晶化時間が800秒を超えているか、または観測されない。測定方法:(株)パーキンエルマー製のDSC8500を用いて、30℃から500℃/分の昇温速度で280℃まで昇温し、10分間温度を保持した後、500℃/分の降温速度で215℃まで降温したときの215℃状態での半結晶化時間を計測する。【選択図】なし |
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