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US 2009/0214869 A1Published application
Method for producing retardation film
AssigneeZeon Corporation
InventorsTaku Hatano, Kohei Arakawa, Shunsuke Yamanaka
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Abstract
A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.
Claims9
A method for producing a retardation film comprising steps or:
- co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer or the thermoplastic resin B, and
- uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.
Dependencies are inferred from the claim text.