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AssigneesMitsubishi Gas Chemical Company, Inc., Mgc Filsheet Co., Ltd.
InventorsOsamu KAKINOKI, Masahide TAKEDA, Shotaro OHNO, Takeshi ONISHI, Masataka SUGIYAMA
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An optical sheet is formed by laminating, by co-extrusion molding, a first layer containing a polycarbonate resin, a second layer containing a polyamide resin, and a third layer, wherein the second layer is laminated between the first layer and the third layer, the first layer and second layer, and the second layer and third layer can each be peeled at the interface, and the outer surface of the first layer has a fine grooved structure. The optical sheet, which is provided with a plurality of layers in such a way, is capable of retaining, a sufficient amount of heat in a laminate in a mold since the entire sheet can be made thick during melt extrusion molding, and is able to improve the transferability of the fine grooved structure. In addition, the optical sheet can be made thinner by using only the peeled first layer as an optical sheet.
An optical sheet obtained by laminating a first layer comprising a polycarbonate resin, a second layer comprising a polyamide resin and a third layer by coextrusion molding, wherein:
A method for manufacturing an optical sheet comprising a step of making a first layer comprising a polycarbonate resin, a second layer comprising a polyamide resin and a third layer into a sheet by coextrusion molding such that the second layer is laminated between the first layer and the third layer,
A single-layer optical sheet comprising a polycarbonate resin, wherein a fine grooved shape is formed on at least one outer surface, the value of [average groove depth (μm) of optical sheet/thickness of optical sheet (μm)] is 0.0375 to 0.5, and the sheet thickness is 1-120 μm.
Dependencies are inferred from the claim text.