Polycarbonate films prepared by coating methods
AssigneeEastman Kodak Company
InventorMarcus S. Bermel
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Abstract
A method of film fabrication is taught that uses a coating and drying apparatus to fabricate resin films suitable for optical applications. In particular, polycarbonate films are prepared by simultaneous application of multiple liquid layers to a moving carrier substrate. After solvent removal, the polycarbonate films are peeled from the sacrificial carrier substrate. Polycarbonate films prepared by the current invention exhibit good dimensional stability and low birefringence.
Claims54
A coating method for forming a polycarbonate film comprising the steps of:
- (a) applying a liquid polycarbonate/solvent mixture onto a moving, discontinuous carrier substrate;
- and
- (b) drying the liquid polycarbonate/solvent mixture to substantially remove the solvent yielding a composite of a polycarbonate film adhered to the discontinuous carrier substrate, the polycarbonate film being releasably adhered to the discontinuous carrier substrate thereby allowing the polycarbonate film to be peeled from the discontinuous carrier substrate.
A composite film comprising:
- a polycarbonate film coated on a discontinuous carrier substrate, the polycarbonate film having a thickness in the range of from about 1 to about 500 μm, the polycarbonate film having an in-plane retardation that is less than 20 nm, the polycarbonate film being adhered to the carrier substrate with an adhesive strength of less than about 250 N/m.
A polycarbonate film comprising:
- a layer of polycarbonate formed by a coating operation, the polycarbonate film having a thickness in the range of from about 1 to about 500 μm, the polycarbonate film having an in-plane retardation that is less than 20 nm.
A polycarbonate film comprising:
- a layer of polycarbonate formed by a coating operation, the polycarbonate film having an in-plane retardation that is less than about 20 nm.
An electronic display device having view screen comprising:
- a polycarbonate film having an in-plane retardation that is less than about 10 nm.
An polycarbonate film comprising:
- a coated layer of polycarbonate having an in-plane retardation that is less than about 20 nm.
Dependencies are inferred from the claim text.