# US 10,310,333 B2 · Double-sided pressure-sensitive-adhesive-layer-attached 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 10,310,333 B2 - Document ID: US10310333B2 - Status: Granted - Kind: B2 - Application number: 15/579,645 - Filed: 2016-06-14 - Published: 2018-06-07 - Granted: 2019-06-04 - Earliest claimed: 2015-06-15 - Assignees: Nitto Denko Corporation - Applicants: Nitto Denko Corporation - Inventors: Atsushi Yasui; Shou Takarada; Shinya Yamamoto; Ryohei Sawazaki - Web page: https://patentgrep.com/patent/US10310333B2 ## CPC - C09J 7/22: Plastics; Metallised plastics - 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} - C09J 7/385: {Acrylic polymers} - C09J 133/06: of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical - C09J 133/08: Homopolymers or copolymers of acrylic acid esters - G02B 1/16: having an anti-static effect, e.g. electrically conducting coatings - G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)} - G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid} - G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) - G02F 1/13338: {Input devices, e.g. touch panels} - G02F 1/1335: Structural association of cells with optical devices, e.g. polarisers or reflectors - G02F 1/133528: {Polarisers} - G02F 1/133711: {by organic films, e.g. polymeric films} - H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light} - C09J 2203/318: for the production of liquid crystal displays - C09J 2301/124: the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape - C09J 2433/00: Presence of (meth)acrylic polymer - G02B 1/00: Optical elements characterised by the material of which they are made; Optical coatings for optical elements - G02F 2202/28: Adhesive materials or arrangements - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A double-sided pressure-sensitive adhesive-layer-attached polarizing film has a polarizing film nearest to a viewer-side of an image display device among at least one polarizing film, a pressure-sensitive adhesive layer A located on the viewer-side, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A. The pressure-sensitive adhesive layers A and B are equipped with separators SA and SB, respectively. The polarizing film is a single-side protected polarizing film having a polarizer of 15 μm or less thickness and having a transparent protective film on only a single side of the polarizer. The pressure-sensitive adhesive layer B is located on the polarizer side of the single-side protected polarizing film. The pressure-sensitive adhesive layer A has a thickness of 25 μm or more; and the pressure-sensitive adhesive layer B has a thickness of 25 μm or less. ## Claims ### Claim 1 A double-sided pressure-sensitive adhesive-layer-attached polarizing film, comprising a polarizing film nearest to a viewer-side of an image display device among at least one polarizing film used in the device, a pressure-sensitive adhesive layer A located on the viewer-side of the polarizing film, and a pressure-sensitive adhesive layer B on a side of the polarizing film that is opposite to the pressure-sensitive adhesive layer A, the pressure-sensitive adhesive layer A being equipped with a separator SA and the pressure-sensitive adhesive layer B being equipped with a separator SB; wherein the polarizing film is a single-side protected polarizing film having a polarizer of 15 μm or less thickness and having a transparent protective film on only a single side of the polarizer, and the pressure-sensitive adhesive layer B is located on the polarizer side of the single-side protected polarizing film; the pressure-sensitive adhesive layer A has a thickness of 25 μm or more; and the pressure-sensitive adhesive layer B has a thickness of 25 μm or less. ### Claim 2 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer B is bonded directly to the polarizer of the single-side protected polarizing film. ### Claim 3 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer B is bonded to the polarizer of the single-side protected polarizing film to interpose a functional layer of 15 μm or less thickness between the layer B and the polarizer. ### Claim 4 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer A has a storage modulus of 0.05 MPa or more at 23° C. ### Claim 5 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the edge of the pressure-sensitive adhesive layer A is at least partially positioned inside an end side of the plane of the single-side protected polarizing film. ### Claim 6 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the separator SA is higher in peel strength than the separator SB. ### Claim 7 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the separator SA has a thickness of 40 μm or more, and further has a separator peel strength of 0.1 N/50-mm or more. ### Claim 8 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the transparent protective film of the single-side protected polarizing film, over this transparent protective film the pressure-sensitive adhesive layer A being laminated, is subjected to easy facilitating treatment. ### Claim 9 (depends on 1) The double-sided pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer A and the pressure-sensitive adhesive layer B each is obtained from an acrylic pressure-sensitive adhesive comprising, as a base polymer, a (meth)acryl-based polymer containing, as a monomer unit, an alkyl (meth)acrylate; the (meth)acryl-based polymer of the pressure-sensitive adhesive layer A comprises, as the monomer unit, 30% by weight or more of 2-ethylhexyl acrylate; and the (meth)acryl-based polymer of the pressure-sensitive adhesive layer B comprises, as the monomer unit, butyl acrylate in a most proportion. ### Claim 10 (depends on 1) The double-sided pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer A and the pressure-sensitive adhesive layer B each is obtained from an acrylic pressure-sensitive adhesive comprising, as a base polymer, a (meth)acryl-based polymer containing an alkyl (meth)acrylate as a monomer unit; and at least one of the (meth) acryl-based polymer of the pressure-sensitive adhesive layer A, and the (meth) acryl-based polymer of the pressure-sensitive adhesive layer B comprises, as a monomer unit, at least one of (meth)acrylic acid and a cyclic nitrogen-containing monomer. ### Claim 11 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer A is a layer irradiated with an active energy ray to be increased in storage modulus. ### Claim 12 (depends on 1) The double-sided pressure-sensitive adhesive-layer-attached polarizing film according to claim 1, wherein the pressure-sensitive adhesive layer A comprises an ultraviolet absorbent. ### Claim 13 (depends on 1) An image display device, comprising at least one double-sided pressure-sensitive-adhesive-layer-attached polarizing films; wherein the double-sided pressure-sensitive-adhesive-layer-attached polarizing film nearest to a viewer-side of an image display device among at least one polarizing film used in the device, is the double-sided-pressure-sensitive-adhesive-layer-attached polarizing film according to claim 1; and the pressure-sensitive adhesive layer A of the double-sided pressure-sensitive-adhesive-layer-attached polarizing film is positioned at the viewer-side, and the pressure-sensitive adhesive layer B of the double-sided pressure-sensitive-adhesive-layer-attached polarizing film is positioned at a display section side of the device. ### Claim 14 (depends on 13) The image display device according to claim 13, which is applied to an in-cell or on-cell touch-sensor built-in liquid crystal display device.