Patents by Inventor Takamasa Hirayama
Takamasa Hirayama 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: 20230026069Abstract: A pressure-sensitive adhesive sheet capable of allowing a small electronic part to be temporarily fixed in a satisfactory manner and satisfactorily peeled. The pressure-sensitive adhesive sheet includes: a gas-generating layer; and a gas barrier layer arranged on at least one side of the gas-generating layer, wherein the gas barrier layer is a layer that is deformed through laser light irradiation of the pressure-sensitive adhesive sheet, wherein a thickness (?m) of a highly elastic portion of the gas barrier layer is equal to or smaller than a value calculated by the following expression (1), and wherein the thickness (?m) of the highly elastic portion of the gas barrier layer is equal to or larger than a value calculated by the following expression (2): 12546×EXP(?0.728×log10(Er×106)) . . . (1); 18096×EXP(?0.949×log10(Er×106)) . . . (2), where Er represents a modulus of elasticity (MPa) of the highly elastic portion of the gas barrier layer by a nanoindentation method at 25° C.Type: ApplicationFiled: November 30, 2020Publication date: January 26, 2023Applicant: NITTO DENKO CORPORATIONInventors: Shusaku UENO, Takamasa HIRAYAMA
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Publication number: 20220372349Abstract: Provided is a pressure-sensitive adhesive sheet capable of allowing a small electronic part (e.g., a chip having a size of 50 ?m/? or less) to be temporarily fixed in a satisfactory manner and satisfactorily peeled. The pressure-sensitive adhesive sheet of the present invention includes a gas-generating layer configured to generate a gas by being irradiated with laser light, wherein a modulus of elasticity Er(gas) [unit: MPa] of the gas-generating layer measured by a nanoindentation method and a thickness h(gas) [unit: ?m] thereof satisfy the following expression (1): Log(Er(gas)×106)?8.01×h(gas)?0.116??(1). In one embodiment, the pressure-sensitive adhesive sheet has a transmittance of from 0% to 35% for light having a wavelength of 360 nm. In one embodiment, the pressure-sensitive adhesive sheet has a transmittance of from 10% to 100% for light having a wavelength of 380 nm.Type: ApplicationFiled: November 30, 2020Publication date: November 24, 2022Applicant: NITTO DENKO CORPORATIONInventors: Shusaku UENO, Takamasa HIRAYAMA
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Publication number: 20220195256Abstract: Provided is a PSA sheet that can bond well with at least a prescribed bonding strength to an adherend before a curing treatment and that can greatly prevent adhesive transfer during separation from the adherend after the curing treatment even when exposed to a high temperature. Provided is a PSA sheet having a PSA layer comprising carbon-carbon double bonds. The PSA sheet satisfies a property that the PSA layer has an elastic modulus of 22 MPa or greater, determined by nanoindentation after a heating/curing treatment in which the PSA sheet is heated at 180° C. for one hour, left standing at 25° C. for 30 minutes and then irradiated with UV rays at an intensity of 60 mW/cm2.Type: ApplicationFiled: January 30, 2020Publication date: June 23, 2022Applicant: NITTO DENKO CORPORATIONInventors: Takatoshi KAWAMOTO, Junji FUKUHARA, Takamasa HIRAYAMA
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Publication number: 20220119685Abstract: Provided is a PSA sheet that can be separated well from the adherend after a curing treatment and that can prevent adhesive transfer during separation even when exposed to a high temperature. Provided is a PSA sheet having a PSA layer. The PSA layer of the PSA sheet comprises a polymer having a glass transition temperature of ?63° C. or higher. The PSA sheet has an adhesive strength reduction rate 17% or higher after a heating/curing treatment.Type: ApplicationFiled: January 30, 2020Publication date: April 21, 2022Applicant: NITTO DENKO CORPORATIONInventors: Takatoshi KAWAMOTO, Junji FUKUHARA, Takamasa HIRAYAMA
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Publication number: 20220059391Abstract: Provided is a method of manufacturing an electronic part including fixing a hard and brittle substrate to a support and separating the hard and brittle substrate from the support, the method being capable of preventing the hard and brittle substrate from being damaged during the separation of the hard and brittle substrate from the support. The method of manufacturing an electronic part of the present invention is a method of manufacturing an electronic part including processing a workpiece fixed onto a support, the method including: fixing the workpiece by arranging at least one heat-peelable layer between the support and the workpiece; processing a surface of the fixed workpiece on an opposite side to the heat-peelable layer; and separating the workpiece from the support by heating the heat-peelable layer after the processing.Type: ApplicationFiled: January 15, 2020Publication date: February 24, 2022Applicant: NITTO DENKO CORPORATIONInventors: Shusaku UENO, Takamasa HIRAYAMA, Makoto AKAI
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Publication number: 20210309890Abstract: Provided is a pressure-sensitive adhesive sheet that may be used for the grinding of a hard and brittle substrate in a backgrinding step for the hard and brittle substrate, the pressure-sensitive adhesive sheet being excellent in all of low contamination property, productivity, grinding accuracy, and peelability. The pressure-sensitive adhesive sheet of the present invention includes a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer has a thickness of from 1 ?m to 300 ?m, and wherein a microhardness H (Pa) of the pressure-sensitive adhesive layer at 25° C. and the thickness, which is represented by hA (?m), of the pressure-sensitive adhesive layer satisfy a relationship represented by the following expression (1). log H?1.9385×log hA+4.2611 . . .Type: ApplicationFiled: August 19, 2019Publication date: October 7, 2021Applicant: NITTO DENKO CORPORATIONInventors: Shusaku UENO, Takumi YUTOU, Takamasa HIRAYAMA
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Publication number: 20210309889Abstract: Provided is a pressure-sensitive adhesive sheet that may be used for the grinding of a hard and brittle substrate in a backgrinding step for the hard and brittle substrate, the pressure-sensitive adhesive sheet being excellent in all of grinding accuracy, low contamination property, productivity, and fixing property. The pressure-sensitive adhesive sheet of the present invention includes a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer contains: a pressure-sensitive adhesive containing a base polymer; and a foaming agent having a foaming temperature of 90° C. or more, and wherein the pressure-sensitive adhesive sheet has, when a pressure-sensitive adhesive surface thereof is bonded to a silicon chip, a shear adhesive strength of 1.0 MPa or more under an ambient temperature of 25° C., and a shear adhesive strength of 0.2 MPa or more under an ambient temperature of 80° C.Type: ApplicationFiled: August 19, 2019Publication date: October 7, 2021Applicant: NITTO DENKO CORPORATIONInventors: Shusaku UENO, Takumi YUTOU, Takamasa HIRAYAMA
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Publication number: 20140044957Abstract: A simplified production method for a chip-shaped electronic component such as a semiconductor chip is provided.Type: ApplicationFiled: July 6, 2012Publication date: February 13, 2014Applicant: NITTO DENKO CORPORATIONInventors: Takamasa Hirayama, Daisuke Shimokawa
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Publication number: 20130260120Abstract: There are provided a base material-less double-sided pressure-sensitive adhesive sheet without warping due to shrinkage of a base material after heat treatment, and having good peelability in heat peeling, and a method for manufacturing electronic parts or semiconductors by using the pressure-sensitive adhesive sheet. A heat-peelable pressure-sensitive adhesive sheet which is a base material-less double-sided pressure-sensitive adhesive sheet including a heat-expandable pressure-sensitive adhesive layer containing heat-expandable microspheres and a pressure-sensitive adhesive layer different from the heat-expandable pressure-sensitive adhesive layer and laminated thereon, wherein the pressure-sensitive adhesive layer has a higher elastic modulus than the heat-expandable pressure-sensitive adhesive layer.Type: ApplicationFiled: March 26, 2013Publication date: October 3, 2013Applicant: NITTO DENKO CORPORATIONInventors: Takamasa HIRAYAMA, Akihisa MURATA, Daisuke SHIMOKAWA
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Publication number: 20130240141Abstract: The present invention provides a heat-resistant pressure-sensitive adhesive tape for the production of a semiconductor device, including a base material layer and a pressure-sensitive adhesive layer formed on each side of the base material layer, in which at least the pressure-sensitive adhesive layer at a side on which a semiconductor chip is to be encapsulated with a resin contains a silicone pressure-sensitive adhesive. The heat-resistant pressure-sensitive adhesive tape is used for temporarily fixing a chip in a method for producing a substrateless semiconductor package which does not use a metal lead frame.Type: ApplicationFiled: March 13, 2012Publication date: September 19, 2013Applicant: NITTO DENKO CORPORATIONInventors: Kazuki SOEJIMA, Shinji HOSHINO, Takamasa HIRAYAMA, Kazuyuki KIUCHI
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Patent number: 8524361Abstract: The invention relates to a heat-peelable pressure-sensitive adhesive sheet for cutting a laminated ceramic sheet, which is used for temporary fixing at cutting of the laminated ceramic sheet, the heat-peelable pressure-sensitive adhesive sheet including a base material and, formed on at least one surface of the base material, a heat-expandable pressure-sensitive adhesive layer containing a pressure-sensitive adhesive and a foaming agent, in which the heat-expandable pressure-sensitive adhesive layer has a gel fraction of 50% by weight or more, and the heat-expandable pressure-sensitive adhesive layer has a glass transition temperature of ?40° C. to 30° C.Type: GrantFiled: March 3, 2010Date of Patent: September 3, 2013Assignee: Nitto Denko CorporationInventors: Kazuki Soejima, Takamasa Hirayama, Daisuke Shimokawa, Masaaki Sato, Yukio Arimitsu
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Patent number: 8409884Abstract: The process for producing an organic EL panel according to the present invention is a process for producing an organic electroluminescent panel by forming an organic electroluminescent element on an ultrathin glass plate by vacuum deposition method, including forming electrodes on the ultrathin glass plate, by temporarily fixing the ultrathin glass plate to a supporting plate via a double-sided adhesive tape having a thermal release adhesive layer formed at least on one face of the base material layer, containing heat-expandable microspheres that start expansion and/or foaming at temperature higher than the vacuum deposition temperature.Type: GrantFiled: June 30, 2009Date of Patent: April 2, 2013Assignee: Nitto Denko CorporationInventors: Takamasa Hirayama, Akihisa Murata, Yukio Arimitsu, Takashi Yamaoka, Masaaki Sato
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Publication number: 20120237764Abstract: In the production process of electronic parts, the static electricity generated when peeling a pressure-sensitive adhesive tape has interfered with the performance of the electronic parts. This problem has been solved by a pressure-sensitive adhesive tape for temporary fixing of electronic parts of the present invention including at least a supporting substrate film and a thermally expandable pressure-sensitive adhesive layer provided on one side of the substrate, wherein the thermally expandable pressure-sensitive adhesive layer contains thermally expandable microspheres and an ionic liquid; the content of the ionic liquid is 0.01 to 10 parts by weight based on 100 parts by weight of a polymer contained in the thermally expandable pressure-sensitive adhesive layer; the surface resistance of the thermally expandable pressure-sensitive adhesive layer is 1.0×1013 ?/? or less; and the ratio of the surface resistance after heating for foaming to that before the heating is 5.0 or less.Type: ApplicationFiled: March 15, 2012Publication date: September 20, 2012Applicant: NITTO DENKO CORPORATIONInventors: Kazuki SOEJIMA, Daisuke SHIMOKAWA, Takamasa HIRAYAMA
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Publication number: 20110200744Abstract: The present invention relates to an adhesive sheet including a substrate and, an adherent layer containing heat-expandable microspheres, the adherent layer being disposed on at least one side of the substrate, in which the adherent layer has a thickness of 10 to 38 ?m, and wherein the heat-expandable microspheres have a maximum particle diameter equal to or smaller than the thickness of the adherent layer and have a mode diameter of 5 to 30 ?m. The adhesive sheet of the invention enables a high-accuracy processing in the step of processing an electronic part such as a small ceramic capacitor to thereby greatly improve product characteristics and productivity.Type: ApplicationFiled: April 26, 2011Publication date: August 18, 2011Applicant: NITTO DENKO CORPORATIONInventors: Takamasa HIRAYAMA, Kazuyuki Kiuchi, Masaaki Sato, Yukio Arimitsu, Daisuke Shimokawa, Tomoko Kishimoto
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Publication number: 20110124136Abstract: Provided is a process for producing an organic EL panel by using an ultrathin glass plate, in which the ultrathin glass plate is not “fractured” or “cut” in the production process, the organic EL element is formed reliably when formed by vacuum deposition, and recovered without damage after the production process, and there is no need for installing an additional step of cleaning the rear face of the ultrathin glass plate.Type: ApplicationFiled: June 30, 2009Publication date: May 26, 2011Applicant: NITTO DENKO CORPORATIONInventors: Takamasa Hirayama, Akihisa Murata, Yukio Arimitsu, Takashi Yamaoka, Masaaki Sato
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Publication number: 20100224316Abstract: The invention relates to a heat-peelable pressure-sensitive adhesive sheet for cutting a laminated ceramic sheet, which is used for temporary fixing at cutting of the laminated ceramic sheet, the heat-peelable pressure-sensitive adhesive sheet including a base material and, formed on at least one surface of the base material, a heat-expandable pressure-sensitive adhesive layer containing a pressure-sensitive adhesive and a foaming agent, in which the heat-expandable pressure-sensitive adhesive layer has a gel fraction of 50% by weight or more, and the heat-expandable pressure-sensitive adhesive layer has a glass transition temperature of ?40° C. to 30° C.Type: ApplicationFiled: March 3, 2010Publication date: September 9, 2010Applicant: NITTO DENKO CORPORATIONInventors: Kazuki SOEJIMA, Takamasa HIRAYAMA, Daisuke SHIMOKAWA, Masaaki SATO, Yukio ARIMITSU
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Publication number: 20100028669Abstract: A re-releasable adhesive agent comprises a radiation-reactive polymer and a radiation polymerization initiator, the radiation-reactive polymer has a side chain derived from at least one monomer expressed by the formula (1): CH2?CR1COOR2 (1), where R1 is a hydrogen atom or a methyl group, and R2 is a C6 or higher alkyl group, and a side chain having one carbon-carbon double bond, and the monomer of formula (1) is contained in a ratio of less than 50 mol % with respect to the total monomer constituting the main chain of the radiation-reactive polymer.Type: ApplicationFiled: July 27, 2009Publication date: February 4, 2010Applicant: NITTO DENKO CORPORATIONInventors: Takashi HABU, Tomokazu Takahashi, Fumiteru Asai, Takamasa Hirayama
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Publication number: 20080038540Abstract: The present invention relates to an adhesive sheet including a substrate and, an adherent layer containing heat-expandable microspheres, the adherent layer being disposed on at least one side of the substrate, in which the adherent layer has a thickness of 10 to 38 ?m, and wherein the heat-expandable microspheres have a maximum particle diameter equal to or smaller than the thickness of the adherent layer and have a mode diameter of 5 to 30 ?m. The adhesive sheet of the invention enables a high-accuracy processing in the step of processing an electronic part such as a small ceramic capacitor to thereby greatly improve product characteristics and productivity.Type: ApplicationFiled: August 14, 2007Publication date: February 14, 2008Applicant: NITTO DENKO CORPORATIONInventors: Takamasa HIRAYAMA, Kazuyuki KIUCHI, Masaaki SATO, Yukio ARIMITSU, Daisuke SHIMOKAWA, Tomoko KISHIMOTO