Patent ID: 11867873
Assignee: ZEON CORPORATION
Field: Optics (Instruments)
Classification: CPC G  B  C | IPC B  C  G

Claim 9:
10. A method of using a cured product of a crosslinkable polymer and solid particles as a masking layer of a multilayer optical film, wherein the multilayer optical film includes:
an optical film layer formed of an alicyclic structure-containing polymer resin,
the masking layer disposed on at least one surface of the optical film layer to be in direct contact therewith,
the masking layer is a single layer and an outermost layer of the multilayer optical film,
the masking layer has a thickness of 10 μm or more and 25 μm or less,
the crosslinkable polymer has a glass transition temperature of 15° C. or higher and 40° C. or lower and has a particle shape having a volume-average particle diameter of 500 nm or less, and
a peeling strength between the optical film layer and the masking layer is 0.005 N/50 mm or more and 0.05 N/50 mm or less,
the method comprising:
mixing the crosslinkable polymer and the solid particles to obtain an aqueous resin composition in a liquid state,
applying the aqueous resin composition onto the at least one surface of the optical film layer, to form a layer of the aqueous resin composition; and
curing the layer of the aqueous resin composition to form the masking layer.