Patents

Thermoplastic Resin Film And Process For Producing The Same

January 23, 2007

A heat-shrinkable resin film for a label was issued a patent. The film consists of a monolayer polyester resin film or a polystyrene resin film. The film has a heat shrinkage in the maximum shrinkage direction of 40% or higher, when a 10 cm x 10 cm square sample cut out is immersed in water at 85°C for 10 seconds, pulled out, subsequently immersed in water at 25°C for 10 seconds, and then pulled out. The film has a content of nitrogen atoms in a surface of the film of 0.1% to 3.0%. A wet tension of the surface of the film is 36 mN/m or higher. Both surfaces of the film exhibit a peeling strength of 5N/15 mm wide or lower after the surfaces of the film are bonded to each other by heat sealing at 75°C.
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