POLYSTYRENE RESIN SHEET HAVING EXCELLENT MOLDABILITY FOR OBTAINING MOLDING HAVING EXCELLENT SURFACE APPEARANCE

PROBLEM TO BE SOLVED: To provide a polystyrene resin sheet having excellent moldability and external appearance without bringing about a ruggedness or a contamination on a surface of a molding, when anti-fogging properties and slipperiness are imparted to the polystyrene resin sheet and its molding...

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Bibliographische Detailangaben
Hauptverfasser:	TAKAKU MASATO, SATO MASARU
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON 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 METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS STORING THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a polystyrene resin sheet having excellent moldability and external appearance without bringing about a ruggedness or a contamination on a surface of a molding, when anti-fogging properties and slipperiness are imparted to the polystyrene resin sheet and its molding and a continuous hot plate is pressure molded. SOLUTION: A biaxially stretched polystyrene resin sheet has a sucrose fatty acid ester of 5 to 50 mg/m2 coated on one side surface, a polydimethylsiloxane oil of 1 to 30 mg/m2, and a sulfosuccinic acid ester salt of 0 to 4 mg/m2 coated on one side surface. The sheet also has a difference of refractive indexes of two perpendicularly crossing lateral and longitudinal directions of 10 to 80 nm and an orienting relaxation stress of 0.2 to 1.0 Mpa.