LAMINATE, PACKAGING MATERIAL AND PACKAGE

• Main Authors: MATSUHISA KENJI, EJIMA YUKI
• Format: Patent
• Language: English; Japanese
• Published: 22.09.2023
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MEASURING; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; PHYSICS; STORING; TESTING; TRANSPORTING

To provide a laminate having excellent tearing properties and interlayer adhesion, as well as easy to be formed into a mono-material film.SOLUTION: A laminate 1 includes a substrate layer 10, a first adhesive layer 21, an intermediate layer 30, a second adhesive layer 22, and a sealant layer 50 laminated in this order. In the laminate, the substrate layer, the intermediate layer and the sealant layer include polyethylene. On a face at the substrate layer side of the laminate, a crystallinity index is 60% or more when measured within a range of diffraction angle 10° to 30° with a 2θ scanning measurement using a parallel beam method of an X-ray diffraction method incident with an X-ray incident angle fixed to be less than 1°, and calculated by a ratio of crystal peak areas of a polyethylene (110) and a polyethylene (200) to a whole peak area. On a face at the sealant layer side of the laminate, a crystallinity index is less than 60% measured with the 2θ scanning measurement and calculated in a similar manner.SELECTED DRAWING: Figure 1 【課題】引き裂き性および層間密着性が良好であり、モノマテリアル化もしやすい積層体を提供する。【解決手段】基材層１０、第一接着剤層２１、中間層３０、第二接着剤層２２、およびシーラント層５０がこの順に積層された積層体１において、基材層、中間層、およびシーラント層はポリエチレンを含む。積層体の基材層側の面において、Ｘ線の入射角を１°未満に固定して入射するＸ線回折法の平行ビーム法を用いた２θスキャン測定により回折角度１０°から３０°の範囲で測定し、全ピーク面積に対するポリエチレン（１１０）とポリエチレン（２００）の結晶ピーク面積の比により算出される結晶化度は６０％以上である。積層体のシーラント層側の面において、２θスキャン測定により測定し、同様に算出される結晶化度は６０％未満である。【選択図】図１