THERMOPLASTIC RESIN MOLDED BODIES AND PACKAGING MATERIALS

To provide a thermoplastic resin molded body that has oxygen barrier properties required for packaging materials and can maintain delamination strength between a barrier layer and a heat seal layer that does not inhibit heat sealing properties in a packaging material configuration with a multilayer structure.SOLUTION: A thermoplastic molded body 1 of the present invention has an oxygen barrier layer 7 which contains a resin (A) having a water vapor barrier property and a resin (B) having an oxygen barrier property, in which the resin (B) exists as an island in the resin (A) to form a dispersed phase. The existence state of the aspect ratio in the dispersed phase is defined as the area average aspect (Aav=Sa/Ss) derived from the sum of the aspect ratios Sa, where Si is the area of each aspect ratio Ai of the dispersed layer in any thickness cross section in the molding direction and width direction, and Ss, the area of the total dispersed layer in the observation range, and the area average aspect ratio of the oxygen barrier layer 7 is 1 or more and 10 or less in the surface area, and is 5 or more and 40 or less in the central area, and the thickness of the oxygen barrier layer 7 is 20 μm or more.SELECTED DRAWING: Figure 1 【課題】包装材に必要な酸素バリア性を有し、多層構成を配した包装材構成においてヒートシール性を阻害しないバリア層とヒートシール層の層間剥離強度を保つ事が可能な熱可塑性樹脂成型体を提供する。【解決手段】熱可塑性樹脂成型体１は、水蒸気バリア性を有する樹脂（Ａ）及び酸素バリア性を有する樹脂（Ｂ）を含み、樹脂（Ｂ）が樹脂（Ａ）の中に島として存在して分散相を形成する酸素バリア層７を有し、分散相におけるアスペクト比の存在状態は、成形方向及び幅方向の任意の厚み断面における、分散層の各アスペクト比Ａｉの面積をＳｉとしたときのアスペクト比の合計Ｓａと、観測範囲の分散層合計の面積Ｓｓとから導かれる面積平均アスペクト（Ａav＝Ｓａ／Ｓｓ）が酸素バリア層７の表層領域では１以上１０以下、中央領域では５以上４０以下であり、酸素バリア層７の厚みは２０μｍ以上である。【選択図】図１