BLOCK COPOLYMER COMPOSITION, HEAT SHRINK FILM USING SAME, AND PACKAGE PROVIDED WITH HEAT SHRINK FILM

[Problem] To provide a block copolymer composition that can form a heat-shrink film in which the size change in the longitudinal direction orthogonal to the shrinkage direction is stably small in the temperature range used at the time of shrink attachment and in which whitening of the film does not...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMURA, Yuya, YOSHIDA, Jun, SAWASATO, Tadashi
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS STORING THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	[Problem] To provide a block copolymer composition that can form a heat-shrink film in which the size change in the longitudinal direction orthogonal to the shrinkage direction is stably small in the temperature range used at the time of shrink attachment and in which whitening of the film does not tend to occur as a result of chemical attacks by organic solvents at the time of printing, while maintaining rigidity, transparency and shrink performance in the shrinkage direction. [Solution] A block copolymer composition containing at least one type of block copolymer component obtained by using a vinyl aromatic hydrocarbon and a conjugated diene, wherein the block copolymer composition satisfies the conditions (1) to (3) indicated below. (1) The weight-average molecular weight is at least 100000 and at most 300000, and the conjugated diene content is at least 18 mass% and at most 35 mass%. (2) The vinyl aromatic hydrocarbon block percentage is at least 80% and at most 100% relative to the total amount of the vinyl aromatic hydrocarbon. (3) At least 30 mass% and at most 60 mass% of block copolymer components having a conjugated diene content of at least 30 mass% are included.