Heat-shrinkable film
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsShigeru Suzuki, Takeshi Oda, Norihiro Shimizu
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Abstract
A heat shrinkable film and a heat shrinkable multilayer film excellent in balance of heat resistance, high shrinkability, high shrinkability particularly at a low temperature, resistance to spontaneous shrinkage, chemical resistance and rigidity, are provided. A heat shrinkable film and a heat shrinkable multilayer film obtained from a resin composition comprising an aromatic vinyl compound/conjugated diene block copolymer having a micro phase separation structure comprising a soft phase and a hard phase and further having a specific structure and a specific dynamic viscoelasticity spectrum and a styrene polymer having a syndyotactic structure, in a specific proportion.
Claims29
A heat shrinkable film comprising a resin composition comprising the following components (A), (B) and (C), obtained by orientation at least in monoaxial direction, and having a heat shrinkage ratio at 80° C. for 10 seconds of at least 20%:
- (A) 50 to 95 mass % of a block copolymer comprising an aromatic vinyl compound and a conjugated diene in a proportion of the aromatic vinyl compound of from 50 to 90 mass %, and having a micro phase separation structure comprising a soft phase and a hard phase,
- (B) 5 to 50 mass % of a styrene type polymer having a syndyotactic structure, and
- (C) 0 to 45 mass % of a styrene type polymer different from the components (A) and (B).
Dependencies are inferred from the claim text.