Patents by Inventor Naofumi Kosaka
Naofumi Kosaka 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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Publication number: 20230144464Abstract: Provided is a PSA sheet that can combine bonding reliability and peeling removability, and further can be peeled off without causing deformation or damage to the adherend in various peeling modes. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a water-peel strength of 2 N/10 mm or less. The PSA sheet further has a stress at 100 % elongation of less than 30 MPa as well as a multiplication product (?f-?f) of fracture stress ?f (MPa) and fracture strain ?f (%) of 250 or greater.Type: ApplicationFiled: February 24, 2021Publication date: May 11, 2023Inventors: Yosuke SHIMIZU, Naofumi KOSAKA, Ryoko ASAI, Kenta KUMAKURA
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Publication number: 20230102613Abstract: An adhesive layer (20a) has a creep deformation rate when a stress of 10000 Pa is applied at 50° C. for 1 second is 10% or less, and a creep deformation rate when a stress of 10000 Pa is applied at 50° C. for 30 minutes is 16% or less, in a creep test using a rotational rheometer, and has a 180° peel adhesive strength of 10 mN/20 mm or more with respect to a PMMA film.Type: ApplicationFiled: February 19, 2021Publication date: March 30, 2023Applicant: NITTO DENKO CORPORATIONInventors: Mizuho MIZUNO, Akiko TANAKA, Naofumi KOSAKA, Kozo NAKAMURA
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Publication number: 20220282129Abstract: Provided is an optical pressure-sensitive adhesive composition that gives a pressure-sensitive adhesive layer having such heating reworkability as to be easily removed from a component such as cover glass at a temperature higher than the service temperature of an image display device. The optical pressure-sensitive adhesive composition of the present invention gives a release force X of 4.0 N/20 mm or less, where the release force X is a release force determined by applying a film to a glass plate through a pressure-sensitive adhesive layer made from the optical pressure-sensitive adhesive composition, and puling the film at a temperature of 100° C., a peel angle of 180 degrees, and a tensile speed of 50 mm/min.Type: ApplicationFiled: March 7, 2022Publication date: September 8, 2022Applicant: NITTO DENKO CORPORATIONInventors: Shinya YAMAMOTO, Sho TAKARADA, Naofumi KOSAKA, Takahiro NONAKA
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Publication number: 20220275250Abstract: Provided is a photo-crosslinkable PSA comprising a polymer having side-chain benzophenone structures. The photo-crosslinkable PSA is a cured product of a PSA composition comprising an ethylenically unsaturated compound and a benzophenone structure-containing component. The photo-crosslinkable PSA has VOC emissions of 500 ?g/g or less. Also provided is a PSA sheet having a PSA layer formed from the photo-crosslinkable PSA.Type: ApplicationFiled: July 28, 2020Publication date: September 1, 2022Inventors: Ryoko ASAI, Naofumi KOSAKA, Yosuke SHIMIZU
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Publication number: 20220275254Abstract: Provided is a PSA sheet having a PSA layer. The PSA layer has a multilayer structure comprising a layer A forming one face of the PSA layer and a layer B placed on the backside of the layer A. The layer B is a photo-crosslinkable PSA layer comprising a photo-crosslinkable polymer.Type: ApplicationFiled: July 28, 2020Publication date: September 1, 2022Inventors: Ryoko ASAI, Naofumi KOSAKA, Yosuke SHIMIZU
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Publication number: 20220169002Abstract: The present invention relates to a laminate including a two-dimensional material and an adhesive sheet having a base material and an adhesive layer whose adhesive force decreases due to ultraviolet rays or heat, in which an adhesive force A at 25° C. of the adhesive layer before the ultraviolet rays or heat applies, to a silicon wafer is 1.0 N/20 mm to 20.0 N/20 mm when the adhesive layer is subjected to 180° peeling at a tensile speed of 300 mm/min, and a surface roughness of an adhesive surface of the adhesive layer after the ultraviolet rays or heat has been applied is 0.01 ?m to 8.00 ?m.Type: ApplicationFiled: February 14, 2020Publication date: June 2, 2022Inventors: Satoshi HONDA, Naofumi KOSAKA, Shotaro MASUDA, Atsushi YASUI, Hiroki AGO, Kenji KAWAHARA, Shun OYAMA
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Patent number: 11236254Abstract: A separator containing a substrate and a release layer formed on at least one side of the substrate wherein the separator shows a strain of not more than 7% when a load of 5N/20 mm is applied for one minute in the pulling direction, and when the substrate is cut in half in the thickness direction to divide the separator into two, an apparent elastic modulus in the pulling direction of one of the divided separators is larger than an apparent elastic modulus in the pulling direction of the other divided separator.Type: GrantFiled: October 17, 2017Date of Patent: February 1, 2022Assignee: NITTO DENKO CORPORATIONInventors: Naofumi Kosaka, Keisuke Shimokita, Hironao Ootake, Asami Doi, Mizuho Chiba, Akiko Takahashi
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Publication number: 20210348036Abstract: Provided is an optical PSA composition that can be easily peeled using an aqueous liquid such as water and has sufficient adhesive strength. An optical PSA composition comprising an acrylic polymer is provided. The PSA composition comprises at least one species of compound A selected among surfactants and compounds having polyoxyalkylene backbones. The monomers forming the acrylic polymer comprises less than 20 wt % alkoxyalkyl (meth)acrylate and less than 20 wt % alkoxypolyalkylene glycol (meth)acrylate. Alternatively, the compound A content is less than 1 part by weight to 100 parts by weight of the acrylic polymer.Type: ApplicationFiled: July 29, 2019Publication date: November 11, 2021Inventors: Masayuki OKAMOTO, Naofumi KOSAKA, Satoshi HONDA, Yosuke SHIMIZU, Ryoko ASAI
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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: 20200270483Abstract: A pressure-bonding adhesive member having a superior positional-adjustment function relative to an adherend having a surface mainly constituted of low-polarity plastic typified by polypropylene, and capable of adhering to the adherend with a sufficiently high adhesive force after positional adjustment. The pressure-bonding adhesive member containing an adhesive layer and plural convex parts formed on one surface of the adhesive layer, wherein, when the convex parts are in contact with a polypropylene plate and the adhesive layer is not in contact with the polypropylene plate, the adhesive member shows a frictional force of not more than 0.6 N/cm2 on the polypropylene plate and a shear adhesive force of not less than 50 N/cm2 to the polypropylene plate.Type: ApplicationFiled: April 14, 2017Publication date: August 27, 2020Inventors: Mizuho CHIBA, Keisuke SHIMOKITA, Asami DOI, Akiko TAKAHASHI, Hironao OOTAKE, Naofumi KOSAKA, Kensuke TANI
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Patent number: 10570320Abstract: Provided is an adhesive member to be adhesively fixed through pressure which has both position adjustability and adhesiveness and is capable of producing a sufficient adhesive strength in addition to the position adjustability. The adhesive member comprises a support, a pressure-sensitive adhesive layer provided on one surface of the support, and a plurality of protrusion elements arranged, in spaced-apart relation to each other, on a principal surface of the pressure-sensitive adhesive layer on a side opposite to the support. Each of the protrusion elements is composed of an aggregation of a plurality of cohesive particles, wherein the adhesive member has a frictional force of 0.4 N/cm2 or less, with respect to a stainless steel plate serving as an adherend, as measured when the protrusion elements are in contact with a surface of the adherend, and a shear adhesive strength of 45 N/cm2 or more.Type: GrantFiled: March 7, 2016Date of Patent: February 25, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kensuke Tani, Mizuho Nagata, Kaori Mizobata, Masatsugu Soga, Ryota Masuda, Masayuki Satake, Kenichi Okada, Naofumi Kosaka, Keisuke Shimokita
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Publication number: 20190241769Abstract: A separator containing a substrate and a release layer formed on at least one side of the substrate wherein the separator shows a strain of not more than 7% when a load of 5N/20 mm is applied for one minute in the pulling direction, and when the substrate is cut in half in the thickness direction to divide the separator into two, an apparent elastic modulus in the pulling direction of one of the divided separators is larger than an apparent elastic modulus in the pulling direction of the other divided separator.Type: ApplicationFiled: October 17, 2017Publication date: August 8, 2019Applicant: NITTO DENKO CORPORATIONInventors: Naofumi KOSAKA, Keisuke SHIMOKITA, Hironao OOTAKE, Asami DOI, Mizuho CHIBA, Akiko TAKAHASHI
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Publication number: 20190016923Abstract: Provided is an adhesive member to be adhesively fixed through pressure which has both position adjustability and adhesiveness and is capable of producing a sufficient adhesive strength in addition to the position adjustability. The adhesive member comprises a support, a pressure-sensitive adhesive layer provided on one surface of the support, and a plurality of protrusion elements arranged, in spaced-apart relation to each other, on a principal surface of the pressure-sensitive adhesive layer on a side opposite to the support. Each of the protrusion elements is composed of an aggregation of a plurality of cohesive particles, wherein the adhesive member has a frictional force of 0.4 N/cm2 or less, with respect to a stainless steel plate serving as an adherend, as measured when the protrusion elements are in contact with a surface of the adherend, and a shear adhesive strength of 45 N/cm2 or more.Type: ApplicationFiled: March 7, 2016Publication date: January 17, 2019Applicant: NITTO DENKO CORPORATIONInventors: Kensuke TANI, Mizuho NAGATA, Kaori MIZOBATA, Masatsugu SOGA, Ryota MASUDA, Masayuki SATAKE, Kenichi OKADA, Naofumi KOSAKA, Keisuke SHIMOKITA
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Patent number: 9508971Abstract: A gas-permeable filter provided with oil repellency is provided. The gas-permeable filter includes a porous membrane having a surface coated with an oil-repellent agent. The oil-repellent agent includes a linear fluorine-containing hydrocarbon group represented by —R1C5F10CH2C4F9 or —R2C6F13, and the porous membrane is a stretched polytetrafluoroethylene (PTFE) porous membrane. Here, R1 and R2 are each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. The gas-permeable filter is provided with oil repellency without significant reduction in gas permeability.Type: GrantFiled: February 24, 2012Date of Patent: November 29, 2016Assignee: NITTO DENKO CORPORATIONInventors: Yoshiki Ikeyama, Nobuaki Maruoka, Naofumi Kosaka, Asuka Onohara
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Publication number: 20140023895Abstract: A gas-permeable filter provided with oil repellency is provided. The gas-permeable filter includes a porous membrane having a surface coated with an oil-repellent agent. The oil-repellent agent includes a linear fluorine-containing hydrocarbon group represented by —R1C5F10CH2C4F9 or —R2C6F13, and the porous membrane is a stretched polytetrafluoroethylene (PTFE) porous membrane. Here, R1 and R2 are each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group. The gas-permeable filter is provided with oil repellency without significant reduction in gas permeability.Type: ApplicationFiled: February 24, 2012Publication date: January 23, 2014Applicant: NITTO DENKO CORPORATIONInventors: Yoshiki Ikeyama, Nobuaki Maruoka, Naofumi Kosaka, Asuka Onohara