Patents by Inventor Taiki Shimokuri
Taiki Shimokuri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11970644Abstract: Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.Type: GrantFiled: January 28, 2019Date of Patent: April 30, 2024Assignee: NITTO DENKO CORPORATIONInventors: Naofumi Kosaka, Yosuke Shimizu, Satoshi Honda, Taiki Shimokuri, Shou Takarada, Masayuki Satake, Kenichi Okada, Atsushi Takashima, Ginji Mizuhara
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Patent number: 11319462Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.Type: GrantFiled: January 29, 2019Date of Patent: May 3, 2022Assignee: NITTO DENKO CORPORATIONInventors: Itsuhiro Hatanaka, Masahito Niwa, Taiki Shimokuri, Shou Takarada, Takahiro Nonaka, Keisuke Hirano, Fumika Kawatake, Mika Ikemura
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Patent number: 11319470Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.Type: GrantFiled: January 29, 2019Date of Patent: May 3, 2022Assignee: NITTO DENKO CORPORATIONInventors: Masahito Niwa, Itsuhiro Hatanaka, Taiki Shimokuri, Shou Takarada, Takahiro Nonaka, Keisuke Hirano, Fumika Kawatake, Mika Ikemura
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Publication number: 20210246338Abstract: A pressure sensitive adhesive sheet (11) according to the present invention contains an acryl-based base polymer having a crosslinked structure, and an acryl-based oligomer having a glass transition temperature of 60° C. or higher. The pressure sensitive adhesive sheet has a storage elastic modulus G?25 of 5 to 75 kPa at 25° C. and 1 Hz, a loss tangent tan ?25 of 0.2 to 0.45 at 25° C. and 1 Hz, a loss tangent tan ?100 of 0.2 to 0.45 at 100° C. and 1 Hz, a difference between the tan 625 and the tan ?100 of ?0.09 to 0.09, and a glass transition temperature of ?15° C. or lower.Type: ApplicationFiled: January 20, 2020Publication date: August 12, 2021Applicant: NITTO DENKO CORPORATIONInventors: Shou TAKARADA, Taiki SHIMOKURI, Minako NODA
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Publication number: 20210230455Abstract: Provided is a method for peeling a PSA sheet adhered on a polarizing plate. The PSA sheet has a PSA layer. The PSA layer includes a layer A forming at least one surface of the PSA layer. Of the polarizing plate, the surface to which the PSA sheet is adhered is corona-treated or plasma-treated. The peeling method includes a water-peel step in which the PSA sheet is peeled from the polarizing plate, in a state where an aqueous liquid exits at the interface between the polarizing plate and the PSA sheet at the front line of peeling the PSA sheet from the polarizing plate, with the aqueous liquid allowed to further enter the interface following the movement of the peel front line.Type: ApplicationFiled: January 28, 2019Publication date: July 29, 2021Inventors: Naofumi KOSAKA, Yosuke SHIMIZU, Satoshi HONDA, Taiki SHIMOKURI, Shou TAKARADA, Masayuki SATAKE, Kenichi OKADA, Atsushi TAKASHIMA, Ginji MIZUHARA
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Publication number: 20210214587Abstract: Provided is a PSA sheet having a PSA layer. The PSA layer includes a layer A forming at least one surface thereof. The PSA sheet has an adhesive strength N0 of 2.0 N/10 mm or greater, after one day at room temperature following application of the layer A side to a surface of an alkaline float glass plate as an adherend having a contact angle of 5°-10° with distilled water; has an N1 to N0 reduction rate of 30% or lower, wherein N1 is a water-resistant adhesive strength measured after stored at room temperature for one day, immersed in water for 30 minutes, taken out from the water and then residual water is wiped off; and has an N2 to N0 reduction rate of 40% or higher, wherein N2 is a water-peel strength measured after stored at room temperature for one day, 20 ?L distilled water is dropped onto the adherend and is allowed to enter a PSA layer/adherend interfacial edge. N2 is measured at a tensile speed of 300 mm/min at a peel angle of 180°.Type: ApplicationFiled: January 28, 2019Publication date: July 15, 2021Inventors: Naofumi KOSAKA, Yosuke SHIMIZU, Satoshi HONDA, Taiki SHIMOKURI, Shou TAKARADA, Masayuki SATAKE, Kenichi OKADA, Atsushi TAKASHIMA, Ginji MIZUHARA, Masayuki OKAMOTO, Ryoko ASAI
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Publication number: 20210179901Abstract: A laminate for a flexible image display device is disclosed including a pressure-sensitive adhesive layer and an optical film including at least a polarizing membrane, wherein an amount of deviation based on the pressure-sensitive adhesive layer in an end part of the laminate when the laminate is bent with a bending radius of 3 mm is set in a specific range, whereby exposure of the pressure-sensitive adhesive layer in the end part of the laminate with bending can be suppressed. The laminate for a flexible image display device includes a pressure-sensitive adhesive layer and an optical film including at least a polarizing membrane, wherein an amount of deviation based on the pressure-sensitive adhesive layer in an end part of the laminate is 100 to 600 ?m when the laminate is bent with a bending radius of 3 mm.Type: ApplicationFiled: July 26, 2018Publication date: June 17, 2021Applicant: NITTO DENKO CORPORATIONInventors: Masakuni Fujita, Yusuke Toyama, Taiki Shimokuri
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Patent number: 10696877Abstract: A curable resin composition for forming an adhesive layer on at least one surface of a substrate (C), the curable resin composition comprising: a compound (A) represented by formula (1): wherein X represents a functional group containing a reactive group, and R1 and R2 each independently represent a hydrogen atom or an optionally substituted, aliphatic hydrocarbon, aryl, or heterocyclic group; and an adhesion aid compound (B), the curable resin composition satisfying formula (X): ?10?HSP (A)?HSP (B)?10 and formula (Y): ?10?HSP (C)?HSP (B)?10, wherein HSP (A) is an HSP value of the compound (A), HSP (B) is an HSP value of the adhesion aid compound (B), and HSP (C) is an HSP value of the substrate (C).Type: GrantFiled: April 20, 2017Date of Patent: June 30, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kayo Shimokawa, Ryoko Asai, Taiki Shimokuri, Yoshiaki Ito, Tatsuya Yamasaki
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Publication number: 20190233681Abstract: A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.Type: ApplicationFiled: January 29, 2019Publication date: August 1, 2019Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Itsuhiro HATANAKA, Taiki SHIMOKURI, Shou TAKARADA, Takahiro NONAKA, Keisuke HIRANO, Fumika KAWATAKE, Mika IKEMURA
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Publication number: 20190233683Abstract: The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.Type: ApplicationFiled: January 29, 2019Publication date: August 1, 2019Applicant: NITTO DENKO CORPORATIONInventors: Itsuhiro HATANAKA, Masahito NIWA, Taiki SHIMOKURI, Shou TAKARADA, Takahiro NONAKA, Keisuke HIRANO, Fumika KAWATAKE, Mika IKEMURA
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Patent number: 10266629Abstract: An aqueous dispersion-type pressure-sensitive adhesive composition for an optical film includes a emulsion particles of a core-shell structure, wherein the emulsion particles include a (meth)acryl-based copolymer (A) having a glass transition temperature of ?55° C. to 0° C. and a (meth)acryl-based copolymer (B) having a glass transition temperature of 0° C. to 180° C., in a single emulsion particle, one of the copolymers (A) and (B) forms a core layer, and another forms a shell layer, at least one of the copolymers (A) and (B) contains a carboxyl group-containing monomer, a difference of the glass transition temperatures between the copolymers (A) and (B) is 50° C. or more, and a ratio (A)/(B) (by weight) is in the range of 50/50 to 90/10.Type: GrantFiled: May 16, 2011Date of Patent: April 23, 2019Assignee: NITTO DENKO CORPORATIONInventors: Kunihiro Inui, Toshitsugu Hosokawa, Takaaki Ishii, Masayuki Satake, Kenichi Okada, Toshitaka Takahashi, Yousuke Makihata, Taiki Shimokuri, Shusaku Goto, Takeharu Kitagawa, Minoru Miyatake, Tomohiro Mori, Takashi Kamijo
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Publication number: 20170306197Abstract: A curable resin composition for forming an adhesive layer on at least one surface of a substrate (C), the curable resin composition comprising: a compound (A) represented by formula (1): wherein X represents a functional group containing a reactive group, and R1 and R2 each independently represent a hydrogen atom or an optionally substituted, aliphatic hydrocarbon, aryl, or heterocyclic group; and an adhesion aid compound (B), the curable resin composition satisfying formula (X): ?10?HSP (A)?HSP (B)?10 and formula (Y): ?10?HSP (C)?HSP (B)?10, wherein HSP (A) is an HSP value of the compound (A), HSP (B) is an HSP value of the adhesion aid compound (B), and HSP (C) is an HSP value of the substrate (C).Type: ApplicationFiled: April 20, 2017Publication date: October 26, 2017Inventors: Kayo SHIMOKAWA, Ryoko ASAI, Taiki SHIMOKURI, Yoshiaki ITO, Tatsuya YAMASAKI
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Publication number: 20160289516Abstract: A water-dispersible pressure-sensitive adhesive composition for an optical film includes emulsion particles each having a core-shell structure in which (A) a (meth)acryl copolymer forms a core layer and (B) a (meth)acryl copolymer forms a shell layer in a single emulsion particle, wherein the (meth)acryl copolymer (A) includes a monomer unit derived from an alkyl (meth)acrylate, the (meth)acryl copolymer (B) includes a monomer unit derived from an aromatic ring-containing (meth)acrylic monomer and a monomer unit derived from an alkyl (meth)acrylate, and a content of the monomer unit derived from the aromatic ring-containing (meth)acrylic monomer in the (meth)acryl copolymer (B) is from 1 to 28% by weight based on the total weight of monomer component used to form the (meth)acryl copolymers (A) and (B).Type: ApplicationFiled: June 10, 2014Publication date: October 6, 2016Applicant: NITTO DENKO CORPORATIONInventors: Yousuke Makihata, Kenichi Okada, Toshitaka Takahashi, Kayo Shimokawa, Taiki Shimokuri, Toshitsugu Hosokawa, Kunihiro Inui
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Patent number: 9181458Abstract: An object of the present invention is to provide a method for manufacturing an optical film-forming pressure-sensitive adhesive layer, which can reduce the problem with visibility without a reduction in productivity, such as a reduction in coating speed. A method for manufacturing an optical film-forming pressure-sensitive adhesive layer, comprising the steps of: (1) applying, to a release film, an aqueous dispersion-type pressure-sensitive adhesive including an aqueous dispersion containing a (meth)acryl-based polymer in the form of an aqueous dispersion; and (2) drying the applied aqueous dispersion-type pressure-sensitive adhesive, wherein the aqueous dispersion-type pressure-sensitive adhesive has a viscosity of 0.01 Pa·s to 0.1 Pa·s at a shear rate of 4,000 (l/s), the optical film-forming pressure-sensitive adhesive layer formed on the release film has a surface roughness (Ra) of 10 nm to 40 nm, and the optical film-forming pressure-sensitive adhesive layer has a haze of 1% or less.Type: GrantFiled: September 25, 2012Date of Patent: November 10, 2015Assignee: NITTO DENKO CORPORATIONInventors: Taiki Shimokuri, Kunihiro Inui, Toshitaka Takahashi, Yousuke Makihata, Toshitsugu Hosokawa, Takaaki Ishii
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Patent number: 9102852Abstract: A pressure-sensitive adhesive layer is obtained by applying and drying an aqueous dispersion type pressure-sensitive adhesive composition. On a surface of the pressure-sensitive adhesive layer, the number of a concave portion having a depth in a thickness direction of 0.2 to 20 ?m and a maximum length along the surface of 1 to 10 mm is 5 or less per 1 m2.Type: GrantFiled: June 20, 2011Date of Patent: August 11, 2015Assignee: NITTO DENKO CORPORATIONInventors: Kayo Shimokawa, Kenichi Okada, Toshitaka Takahashi, Yoshiaki Kitani, Taiki Shimokuri, Yousuke Makihata
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Publication number: 20150132567Abstract: It is an object of the invention to provide a pressure-sensitive adhesive layer that is designed for an optical film to be less likely to cause depolarization and to have good reworkability and good recyclability. The present invention relates to a pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition contains an emulsion particle having a core-shell structure comprising a shell layer of (A) a (meth)acryl-based copolymer and a core layer of (B) a methacryl-based copolymer in a single emulsion particle, a mixture ratio (A)/(B) (on a solid weight basis) of the (meth)acryl-based copolymer (A) and the methacryl-based copolymer (B) is in the range of 50/50 to 90/10, the emulsion particle in the aqueous dispersion-type pressure-sensitive adhesive composition has a number average particle size of 10 nm to 100 nm.Type: ApplicationFiled: April 16, 2013Publication date: May 14, 2015Applicant: NITTO DENKO CORPORATIONInventors: Taiki Shimokuri, Kunihiro Inui, Toshitaka Takahashi, Yousuke Makihata, Toshitsugu Hosokawa, Takaaki Ishii
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Patent number: 9029468Abstract: A pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition is an aqueous dispersion comprising a water-dispersible (meth)acryl-based copolymer (A) having a glass transition temperature from ?55° C. to less than 0° C.; and a water-soluble or water-dispersible component (B) having a glass transition temperature of 0° C. or more, a mixture ratio (A)/(B) is in the range of 50-97/3-50, the component (B) forms domains with maximum lengths between 1 nm and 200 nm in a resin component made of the (meth)acryl-based copolymer (A), and the pressure-sensitive adhesive layer has a haze value (H20) of 1% or less when having a thickness of 20 ?m. The pressure-sensitive adhesive layer for an optical film, which is made from an aqueous dispersion-type pressure-sensitive adhesive composition has good reworkability or recyclability, and has a sufficient level of durability.Type: GrantFiled: November 18, 2011Date of Patent: May 12, 2015Assignee: Nitto Denko CorporationInventors: Kunihiro Inui, Toshitsugu Hosokawa, Takaaki Ishii, Masayuki Satake, Kenichi Okada, Toshitaka Takahashi, Taiki Shimokuri, Yousuke Makihata
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Publication number: 20130248118Abstract: A pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition is an aqueous dispersion comprising a water-dispersible (meth)acryl-based copolymer (A) having a glass transition temperature from ?55° C. to less than 0° C.; and a water-soluble or water-dispersible component (B) having a glass transition temperature of 0° C. or more, a mixture ratio (A)/(B) is in the range of 50-97/3-50, the component (B) forms domains with maximum lengths between 1 nm and 200 nm in a resin component made of the (meth)acryl-based copolymer (A), and the pressure-sensitive adhesive layer has a haze value (H20) of 1% or less when having a thickness of 20 ?m. The pressure-sensitive adhesive layer for an optical film, which is made from an aqueous dispersion-type pressure-sensitive adhesive composition has good reworkability or recyclability, and has a sufficient level of durability.Type: ApplicationFiled: November 18, 2011Publication date: September 26, 2013Applicant: NITTO DENKO CORPORATIONInventors: Kunihiro Inui, Toshitsugu Hosokawa, Takaaki Ishii, Masayuki Satake, Kenichi Okada, Toshitaka Takahashi, Taiki Shimokuri, Yousuke Makihata
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Publication number: 20130095298Abstract: A pressure-sensitive adhesive layer is obtained by applying and drying an aqueous dispersion type pressure-sensitive adhesive composition. On a surface of the pressure-sensitive adhesive layer, the number of a concave portion having a depth in a thickness direction of 0.2 to 20 ?m and a maximum length along the surface of 1 to 10 mm is 5 or less per 1 m2.Type: ApplicationFiled: June 20, 2011Publication date: April 18, 2013Applicant: NITTO DENKO CORPORATIONInventors: Kayo Shimokawa, Kenichi Okada, Toshitaka Takahashi, Yoshiaki Kitani, Taiki Shimokuri, Yousuke Makihata
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Publication number: 20130052457Abstract: An aqueous dispersion-type pressure-sensitive adhesive composition for an optical film of the invention includes a emulsion particles of a core-shell structure, wherein the emulsion particles include a (meth)acryl-based copolymer (A) having a glass transition temperature of ?55° C. to 0° C. and a (meth)acryl-based copolymer (B) having a glass transition temperature of 0° C. to 180° C., in a single emulsion particle, one of the copolymers (A) and (B) forms a core layer, and another forms a shell layer, at least one of the copolymers (A) and (B) contains a carboxyl group-containing monomer, a difference of the glass transition temperatures between the copolymers (A) and (B) is 50° C. or more, and a ratio (A)/(B) (by weight) is in the range of 50/50 to 90/10. The above composition can form a pressure-sensitive adhesive layer which is prevented from peeling in a moist environment and also prevented from peeling over time after taken out of a high-temperature moist environment.Type: ApplicationFiled: May 16, 2011Publication date: February 28, 2013Applicant: NITTO DENKO CORPORATIONInventors: Kunihiro Inui, Toshitsugu Hosokawa, Takaaki Ishii, Masayuki Satake, Kenichi Okada, Toshitaka Takahashi, Yousuke Makihata, Taiki Shimokuri, Shusaku Goto, Takeharu Kitagawa, Minoru Miyatake, Tomohiro Mori, Takashi Kamijo