# US 11,079,526 B2 · Polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, method for producing polarizing film, and image display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,526 B2 - Document ID: US11079526B2 - Status: Granted - Kind: B2 - Application number: 16/086,076 - Filed: 2017-03-17 - Published: 2020-09-17 - Granted: 2021-08-03 - Earliest claimed: 2016-03-28 - Assignees: Nitto Denko Corporation - Applicants: Nitto Denko Corporation - Inventors: Satoshi Mita; Tomonori Ueno; Jingfan Xu; Atsushi Kishi - Web page: https://patentgrep.com/patent/US11079526B2 ## CPC - G02B 1/14: Protective coatings, e.g. hard coatings - B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} - B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers} - G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00) - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - G09F 9/00: Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) - H05B 33/02: Details - H10K 59/00: Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 - G02F 1/133528: {Polarisers} - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02F 2202/28: Adhesive materials or arrangements - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A polarizing film is disclosed including a polarizer having a thickness of 10 μm or less, and a transparent resin layer on at least one surface of the polarizer, wherein the polarizer includes a polyvinyl alcohol-based resin, and has a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P>−(100.929T−42.4−1)×100 (provided that T<42.3) or P≥99.9 (provided that T≥42.3), and the transparent resin layer is a formed product of a transparent resin layer forming material including a water-based emulsion resin and has a hardness of 0.01 GPa or more. The polarizing film, using a thin-polarizer, can suppress the occurrence of defects such as nano-slits and is further restrained from being lowered in optical properties in a heating and humidifying test to have a high optical reliability. ## Claims ### Claim 1 A polarizing film, comprising a polarizer having a thickness of 10 μm or less, and a transparent resin layer on at least one surface of the polarizer, wherein the polarizer comprises a polyvinyl alcohol-based resin, and is designed to have a single-body transmittance T and a polarization degree P representing optical properties satisfying the condition of the following formula: P>−(100.929T−42.4−1)×100 provided that T<42.3 or P≥99.9 provided that T≥42.3, the transparent resin layer is a formed product of a transparent resin layer forming material comprising a water-based emulsion resin and has a hardness of 0.01 GPa or more, and wherein the transparent resin layer has an indentation load of 1 to 60 μN, and the indentation load is measured by a nano-indentation method. ### Claim 2 (depends on 1) The polarizing film according to claim 1, comprising a relaxation layer in which an alignment of the polyvinyl alcohol-based resin is partially relaxed on a side of the polarizer on which the transparent resin layer is formed. ### Claim 3 (depends on 2) The polarizing film according to claim 2, wherein the relaxation layer has a thickness of ⅔ or less of the film thickness of the polarizer. ### Claim 4 (depends on 2) The polarizing film according to claim 2, wherein a thickness of the relaxation layer is 0.1 μm or more. ### Claim 5 (depends on 1) The polarizing film according to claim 1, wherein the transparent resin layer is a layer showing no pressure-sensitive adhesion properties. ### Claim 6 (depends on 1) The polarizing film according to claim 1, further comprising a protective film. ### Claim 7 (depends on 1) A process for producing the polarizing film recited in claim 1, comprising: a step of applying the transparent resin layer forming material comprising a water-based emulsion resin directly onto at least one surface of the polarizer having a thickness of 10 μm or less, and a step of drying a coating layer of the transparent resin layer forming material to form the transparent resin layer. ### Claim 8 (depends on 1) A pressure-sensitive-adhesive-layer-attached polarizing film, comprising the polarizing film recited in claim 1, and further comprising a pressure-sensitive-adhesive layer on a transparent-resin-layer-side of the polarizing film. ### Claim 9 (depends on 8) An image display device, comprising the pressure-sensitive-adhesive-layer-attached polarizing film recited in claim 8. ### Claim 10 (depends on 1) An image display device, comprising the polarizing film recited in claim 1.