# US 11,999,119 B2 · Method for manufacturing polarizing plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,119 B2 - Document ID: US11999119B2 - Status: Granted - Kind: B2 - Application number: 17/053,020 - Filed: 2019-06-24 - Published: 2021-08-19 - Granted: 2024-06-04 - Earliest claimed: 2018-06-22 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Hyung Il Yang; Dong Ho Ko; Seong Jin Kim; Chul In Joung; Myeong Ho Lee; Lee Won Kim - Web page: https://patentgrep.com/patent/US11999119B2 ## CPC - B29D 11/00644: {polarizing} - B32B 27/08: of synthetic resin - B32B 37/12: characterised by using adhesives - B32B 38/0012: {Mechanical treatment, e.g. roughening, deforming, stretching} - 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} - G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)} - B32B 38/10: Removing layers, or parts of layers, mechanically or chemically - B32B 2037/1253: {curable adhesive} - B32B 2038/0028: {Stretching, elongating} - B32B 2307/42: Polarizing, birefringent, filtering - B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - 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 ## Abstract The present disclosure relates to a method for manufacturing a polarizing plate. The method includes a step of preparing a transfer type retarder laminate which has a carrier substrate, an alignment film and a retarder layer sequentially; and a step of laminating the transfer type retarder laminate on one side of a polymeric stretched film containing a dichroic substance, where a peel force at a peeling angle of 90° between the carrier substrate and the retarder layer in the transfer type retarder laminate and a peeling rate of 300 mm/min is in a range of 0.10 N/20 mm to 0.13 N/20 mm. The polarizing plate can be used as a circularly polarizing plate or an optical compensation polarizing plate in various display devices. ## Claims ### Claim 1 A method for manufacturing a polarizing plate, comprising: a step of preparing a transfer type retarder laminate including a carrier substrate, an alignment film formed on the carrier substrate and a retarder layer formed on the alignment film; and a step of laminating the transfer type retarder laminate on one side of a polymeric stretched film containing a dichroic substance, wherein the alignment film comprises a photo-orientational compound, and the alignment film is formed on the carrier substrate by irradiating ultraviolet rays to the photo-orientational compound in a range of 250 mJ/cm2 to 1300 mJ/cm2, wherein in the step of preparing the transfer type retarder laminate, no pressure-sensitive adhesive or other adhesive layer material is used during forming the retarder layer on the alignment film, and wherein a peel force at a peeling angle of 90° between the carrier substrate and the alignment film in the transfer type retarder laminate and a peeling rate of 300 mm/min is in a range of 0.10 N/20 mm to 0.13 N/20 mm. ### Claim 2 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the retarder layer has a single-layer structure, and the transfer type retarder laminate is formed by performing a process of forming the alignment film on the carrier substrate, and then coating a liquid crystal composition on the alignment film and curing the composition once to form the retarder layer. ### Claim 3 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the retarder layer has a multilayer structure, and the transfer type retarder laminate is formed by performing a process of forming the alignment film on the carrier substrate, and then coating a liquid crystal composition on the alignment film and curing the composition two or more times to form the retarder layer. ### Claim 4 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the dichroic substance comprises iodine or a dichroic dye. ### Claim 5 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the polymeric stretched film is a polyvinyl alcohol-based stretched film. ### Claim 6 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the dichroic substance exists in a state oriented in the stretching direction of the polymeric stretched film. ### Claim 7 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, wherein the retarder layer is laminated on the polymeric stretched film via an adhesive layer. ### Claim 8 (depends on 7) The method for manufacturing a polarizing plate according to claim 7, wherein the adhesive layer is an ultraviolet curing adhesive layer. ### Claim 9 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, further comprising a step of laminating a surface-treated film on the opposite side of the polymeric stretched film on which the transfer type retarder laminate is laminated. ### Claim 10 (depends on 9) The method for manufacturing a polarizing plate according to claim 9, wherein the lamination of the surface-treated film is performed simultaneously with the lamination of the transfer type retarder laminate and the polymeric stretched film. ### Claim 11 (depends on 10) The method for manufacturing a polarizing plate according to claim 10, wherein the surface-treated film comprises a base film and a surface-treated layer formed on the base film. ### Claim 12 (depends on 1) The method for manufacturing a polarizing plate according to claim 1, further comprising a step of laminating the transfer type retarder laminate to the polymeric stretched film and then removing the carrier substrate. ### Claim 13 (depends on 12) The method for manufacturing a polarizing plate according to claim 12, further comprising a step of forming a pressure-sensitive adhesive layer on one side of the alignment film from which the carrier substrate has been removed.