LAMINATED FOAMED SHEET AND RESIN MOLDING

• Main Authors: KATO OSAMU, ONISHI TOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2017
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To provide a laminated foamed sheet which exhibits good moldability even at comparatively low temperature and is useful for forming a resin molding that is less likely to cause deformation even when heated, and to provide a resin molding made from a laminated foamed sheet such as a container for food storage excellent in production efficiency.SOLUTION: A polyethylene resin composition is adopted which has a relationship of a specific extrapolation glass transition initiation temperature, a specific midpoint glass transition temperature T, a specific extrapolation glass transition initiation temperature Tand a mid point glass transition temperature, as a formation material of a resin foamed layer and a resin non-foamed layer.SELECTED DRAWING: Figure 1 【課題】比較的低温でも良好な成形性を示し、しかも、加熱しても変形が生じ難い樹脂成形品の形成に有用な積層発泡シートの提供、および、製造効率に優れた食品収容用容器などの積層発泡シート製の樹脂成形品の提供。【解決手段】樹脂発泡層と樹脂非発泡層の形成材料として、特定の補外ガラス転移開始温度、特定の中間点ガラス転移温度Ｔｍｇ、特定の補外ガラス転移開始温度Ｔｉｇと中間点ガラス転移温度の関係を有するポリスチレン系樹脂組成物を採用する。【選択図】図１