Multilayer heat-shrinkable styrene-based film and method for...

B - Operations – Transporting – 32 – B

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B32B 27/30 (2006.01) C08L 51/04 (2006.01) C08L 53/02 (2006.01)

Patent

CA 2658492

Disclosed is a heat-shrinkable multilayer styrene film which is excellent in lubricity and blocking resistance, and hardly causes ink scattering during printing. Specifically disclosed is a heat-shrinkable multilayer styrene film comprising a layer containing 0.8-2.5 parts by weight of a polystyrene resin and 0.02-0.15 part by weight of organic fine particles having an average particle diameter of 0.5-5 µm per 100 parts by weight of a block copolymer composed of a vinyl aromatic hydrocarbon and a conjugated diene hydrocarbon at a composition ratio within a specific range, and a layer containing a block copolymer composed of a vinyl aromatic hydrocarbon and a conjugated diene hydrocarbon at a composition ratio within a specific range or a layer containing a resin composition including a copolymer composed of a vinyl aromatic hydrocarbon and an aliphatic unsaturated carboxylic acid ester at a composition ratio within a specific range.

La présente invention concerne un film multicouche thermorétractable à base de styrène présentant une excellente onctuosité et une résistance à l'adhérence, et n'entraînant que peu de diffusion d'encre lors de son impression. De manière spécifique, l'invention concerne un film multicouche thermorétractable à base de styrène comprenant une couche contenant 0,8 à 2,5 parties en poids d'une résine polystyrène et 0,02 à 0,15 parties en poids de fines particules organiques ayant un diamètre de particules moyen de 0,5 à 5 µm par 100 parties en poids d'un copolymère bloc constitué d'hydrocarbure aromatique vinylique et d'hydrocarbure diénique conjugué à un rapport de composition compris dans une plage spécifique ou une couche contenant une composition à base de résine comprenant un copolymère constitué d'un hydrocarbure aromatique vinylique et d'un ester d'acide carboxylique insaturé aliphatique à un rapport de composition compris dans une plage spécifique.

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