Optical films and process for making them
AssigneeEastman Kodak Company
InventorsJehuda Greener, Charles Anderson, Marcus 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, resin films are prepared by simultaneous application of multiple liquid layers to a moving carrier substrate having low surface energy. After solvent removal, the resin films are peeled from the sacrificial carrier substrate. Films prepared by the current invention exhibit good dimensional stability and low out-of-plane retardation.
Claims55
A process for forming an optical resin film, having an out-of-plane retardation (OPR) of less than 100 nm, comprising the steps of:
- (a) applying a liquid optical resin /solvent mixture onto the surface of a moving discontinuous carrier substrate having a surface energy level less than 35 erg/cm2;
- (b) drying the liquid resin/solvent mixture to substantially remove the solvent yielding a composite of a resin film weakly adhered to the carrier substrate, the resin film being releasably adhered to the carrier substrate thereby allowing the resin film to be peeled from the carrier substrate, and
- (c) removing the film from the substrate, with the formed film exhibiting OPR of less than 100 nm, and in plane retardation of less than 20 nm.
A composite element comprising:
- a resin film coated on a discontinuous carrier substrate, the resin film having a thickness in the range of from 1 to 100 μm, the resin film having an in-plane retardation that is less than 20 nm and an OPR less than 20 nm, the resin film being adhered to the carrier substrate with an adhesive strength of less than about 250 N/m.
A composite element comprising:
- a polycarbonate resin film at least 10 meters in length coated on a discontinuous carrier substrate, the resin film having a thickness in the range of from 1 to 100 μm, the resin film having an in-plane retardation that is less than 20 nm and an out of plane retardation less than 100 nm, the resin film being adhered to the carrier substrate with an adhesive strength of less than about 250 N/m.
A resin film comprising:
- a layer of resin formed by a coating operation, the resin film having a thickness in the range of from 1 to 100 μm, the resin film having an in-plane retardation that is less than 20 nm and an out-of-plane retardation of less than 20 nm.
A liquid crystal display comprising a resin film comprising:
- a layer of resin formed by a coating operation, the resin film having a thickness in the range of from 1 to 100 μm, the resin film having an in-plane retardation that is less than 20 nm and an out-of-plane retardation of less than 20 nm.
A liquid crystal display comprising a resin film comprising:
- a layer of polycarbonate resin formed by a coating operation, the resin film having a thickness in the range of from 5 to 100 μm, the resin film having an in-plane retardation that is less than 20 nm and an out-of-plane retardation of less than 100 nm.
Dependencies are inferred from the claim text.