# US 2019/0168482 A1 · Peelable laminated film and method for producing polarizing plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168482 A1 - Document ID: US20190168482A1 - Status: Published application - Kind: A1 - Application number: 16/267,846 - Filed: 2019-02-05 - Published: 2019-06-06 - Earliest claimed: 2016-09-09 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Shuhei OKUDA; Daiki WAKIZAKA - Web page: https://patentgrep.com/patent/US20190168482A1 ## CPC - B32B 27/08: of synthetic resin - B29D 11/00644: {polarizing} - B32B 7/06: permitting easy separation - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - 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} - B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers} - B32B 27/36: comprising polyesters - B29D 11/0073: {Optical laminates} - B32B 2307/42: Polarizing, birefringent, filtering - B32B 2307/732: Dimensional properties - B32B 2307/748: Releasability - G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)} - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A peelable laminated film in which a substrate film containing a polyester resin and a light transmitting film containing a resin having a glass transition temperature of higher than 80° C. and an aromatic ester compound are laminated, and a method for producing a polarizing plate which contains bonding a surface of the light transmitting film of the peelable laminated film to a polarizer through an adhesive, the surface being opposite to an interface of the light transmitting film to the substrate film, and then peeling off the substrate film to obtain a polarizing plate having the polarizer and the light transmitting film are provided. ## Claims ### Claim 1 A peelable laminated film in which a substrate film containing a polyester resin and a light transmitting film containing a resin having a glass transition temperature of higher than 80° C. and an aromatic ester compound are laminated. ### Claim 2 (depends on 1) The peelable laminated film according to claim 1, wherein a stress in a case where the substrate film is peeled off from the light transmitting film is 0.05 N/25 mm or more and 2.00 N/25 mm or less. ### Claim 3 (depends on 1) The peelable laminated film according to claim 1, wherein a value obtained by subtracting a solubility parameter value of the light transmitting film from a solubility parameter value of the substrate film is 2 to 5 (J/cm3)0.5. ### Claim 4 (depends on 2) The peelable laminated film according to claim 2, wherein a value obtained by subtracting a solubility parameter value of the light transmitting film from a solubility parameter value of the substrate film is 2 to 5 (J/cm3)0.5. ### Claim 5 (depends on 1) The peelable laminated film according to claim 1, wherein a thickness of the light transmitting film is 0.1 to 10 μm. ### Claim 6 (depends on 2) The peelable laminated film according to claim 2, wherein a thickness of the light transmitting film is 0.1 to 10 μm. ### Claim 7 (depends on 3) The peelable laminated film according to claim 3, wherein a thickness of the light transmitting film is 0.1 to 10 μm. ### Claim 8 (depends on 4) The peelable laminated film according to claim 4, wherein a thickness of the light transmitting film is 0.1 to 10 μm. ### Claim 9 (depends on 1) The peelable laminated film according to claim 1, wherein an in-plane retardation value of the light transmitting film at a wavelength of 590 nm is 0 to 20 nm, and a thickness-direction retardation value of the light transmitting film at a wavelength of 590 nm is −25 to 25 nm. ### Claim 10 (depends on 2) The peelable laminated film according to claim 2, wherein an in-plane retardation value of the light transmitting film at a wavelength of 590 nm is 0 to 20 nm, and a thickness-direction retardation value of the light transmitting film at a wavelength of 590 nm is −25 to 25 nm. ### Claim 11 (depends on 3) The peelable laminated film according to claim 3, wherein an in-plane retardation value of the light transmitting film at a wavelength of 590 nm is 0 to 20 nm, and a thickness-direction retardation value of the light transmitting film at a wavelength of 590 nm is −25 to 25 nm. ### Claim 12 (depends on 1) The peelable laminated film according to claim 1, wherein the resin having a glass transition temperature of higher than 80° C. contained in the light transmitting film is a polystyrene-based resin. ### Claim 13 (depends on 2) The peelable laminated film according to claim 2, wherein the resin having a glass transition temperature of higher than 80° C. contained in the light transmitting film is a polystyrene-based resin. ### Claim 14 (depends on 3) The peelable laminated film according to claim 3, wherein the resin having a glass transition temperature of higher than 80° C. contained in the light transmitting film is a polystyrene-based resin. ### Claim 15 (depends on 1) The peelable laminated film according to claim 1, wherein the aromatic ester compound is a compound obtained by condensing at least one selected from phthalic acid, isophthalic acid, or terephthalic acid and an aliphatic diol. ### Claim 16 (depends on 2) The peelable laminated film according to claim 2, wherein the aromatic ester compound is a compound obtained by condensing at least one selected from phthalic acid, isophthalic acid, or terephthalic acid and an aliphatic diol. ### Claim 17 (depends on 3) The peelable laminated film according to claim 3, wherein the aromatic ester compound is a compound obtained by condensing at least one selected from phthalic acid, isophthalic acid, or terephthalic acid and an aliphatic diol. ### Claim 18 (depends on 1) The peelable laminated film according to claim 1, wherein a weight-average molecular weight of the aromatic ester compound is 500 to 50,000. ### Claim 19 (depends on 2) The peelable laminated film according to claim 2, wherein a weight-average molecular weight of the aromatic ester compound is 500 to 50,000. ### Claim 20 (depends on 1) A method for producing a polarizing plate comprising: bonding a surface of the light transmitting film of the peelable laminated film according to claim 1 to a polarizer through an adhesive, the surface being opposite to an interface of the light transmitting film to the substrate film, and then peeling off the substrate film to obtain a polarizing plate having the polarizer and the light transmitting film.