Patents by Inventor Masahito Niwa
Masahito Niwa 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: 20200339842Abstract: Provided is a PSA sheet that shows excellent adhesive strength to both high-polar and low-polar adherends with reduced dependence on fossil-resource-based materials. The PSA sheet has a PSA layer formed from a natural rubber-based PSA. At least 20% by weight of all repeat units forming the base polymer of the PSA are derived from an acrylic monomer. Biomass-derived carbons account for at least 50% of the total carbon content of the PSA layer. The PSA sheet has an adhesive strength of 18 N/20 mm or greater to a stainless steel plate (after left at 50° C. for 2 h) and an adhesive strength of 15 N/20 mm or greater to a polypropylene plate (after left at 50° C. for 2 h).Type: ApplicationFiled: April 22, 2020Publication date: October 29, 2020Applicant: NITTO DENKO CORPORATIONInventors: Shigeki WATANABE, Masahito NIWA
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Publication number: 20200255701Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express both of excellent impact resistance and excellent oil resistance. The double-sided pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer laminate obtained by laminating “n” or more pressure-sensitive adhesive layers, wherein “n” represents an integer of 2 or more, wherein each of the pressure-sensitive adhesive layers is formed from a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition contains at least one kind selected from the group consisting of a monomer component (m) and a polymer component (P) obtained by polymerizing the monomer component (m), and wherein the monomer component (m) contains 50 wt % or more of butyl acrylate.Type: ApplicationFiled: January 30, 2020Publication date: August 13, 2020Applicant: NITTO DENKO CORPORATIONInventors: Naohiro KATO, Masahito Niwa, Yasushi Buzojima, Naoaki Higuchi, Masataka Nishiwaki
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Publication number: 20200254734Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express excellent impact resistance. The double-sided pressure-sensitive adhesive tape of the present invention includes a pressure-sensitive adhesive layer laminate obtained by laminating “n” or more pressure-sensitive adhesive layers, wherein “n” represents an integer of 2 or more, wherein each of the pressure-sensitive adhesive layers is formed from a pressure-sensitive adhesive composition, and wherein the pressure-sensitive adhesive composition contains a low-polarity filler.Type: ApplicationFiled: January 3, 2020Publication date: August 13, 2020Applicant: Nitto Denko CorporationInventors: Takuya Fujita, Naohiro Kato, Masahito Niwa, Yasushi Buzojima
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Publication number: 20200208026Abstract: Provided is a PSA composition with greatly reduced dependence on fossil-resource-based materials while comprising an acrylic PSA. The PSA composition provided includes a PSA. The PSA is an acrylic PSA including an acrylic polymer. The acrylic polymer is formed from monomers including more than 50% (by weight) acrylic monomer. At least 50% of all carbons in the PSA are biomass-based carbons.Type: ApplicationFiled: December 20, 2019Publication date: July 2, 2020Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Shigeki WATANABE, Masataka NISHIWAKI, Kazuki MINOURA
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Publication number: 20200208022Abstract: Provided is a PSA sheet with reduced dependence on fossil-resource-based materials while having an acrylic PSA. The PSA sheet provided includes a PSA layer. The PSA layer is formed from a PSA composition including an acrylic polymer. The acrylic polymer is a polymer of monomers that include more than 50% (by weight) acrylic monomer. At least 50% of all carbons in the PSA layer are biomass-derived carbons. The PSA sheet has a peel strength of less than 3 N/20 mm to a stainless steel plate.Type: ApplicationFiled: December 20, 2019Publication date: July 2, 2020Applicant: NITTO DENKO CORPORATIONInventors: Masahito Niwa, Shigeki Watanabe, Masataka Nishiwaki, Kazuki Minoura
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Publication number: 20200095473Abstract: Provided is a PSA sheet for use in electronic devices. The PSA sheet has a PSA layer formed from a natural rubber-based PSA. The base polymer of the PSA comprises a methyl methacrylate-modified natural rubber and at least 50% of all carbons in the PSA layer comes from biomass-derived carbons. The PSA sheet shows a displaced length of 1.0 mm/60 min or less in a heat-resistant holding power test carried out at 80° C.Type: ApplicationFiled: September 20, 2019Publication date: March 26, 2020Applicant: NITTO DENKO CORPORATIONInventors: Shigeki Watanabe, Masahito Niwa, Masataka Nishiwaki, Kazuki Minoura
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Publication number: 20200095474Abstract: Provided is a PSA sheet for electronic devices with reduced dependence on fossil-resource-based materials and is also suited for use in electronic devices. The PSA sheet for use in electronic devices provided has a PSA layer formed from a natural rubber-based PSA. At least 20% by weight of all repeat units forming the base polymer of the PSA comes from an acrylic monomer and at least 50% of the total carbon content of the PSA layer is attributed to biomass-derived carbons. The PSA sheet has a shear bonding strength of 1.8 MPa or greater.Type: ApplicationFiled: September 20, 2019Publication date: March 26, 2020Applicant: NITTO DENKO CORPORATIONInventors: Shigeki WATANABE, Masahito NIWA, Masataka NISHIWAKI, Kazuki MINOURA
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Publication number: 20190264067Abstract: Provided is a novel double-sided pressure-sensitive adhesive tape that has excellent impact resistance and preferably further has excellent oil resistance. The double-sided pressure-sensitive adhesive tape has a local maximum value of a loss tangent tan ? of 1.5 or more, and a temperature at which the local maximum value is obtained, of from ?30° C. to 0° C.Type: ApplicationFiled: January 15, 2019Publication date: August 29, 2019Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Hiroki KIGAMI
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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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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: 20180267450Abstract: An image forming apparatus includes a first outlet portion that allows sheet to be discharged therethrough toward a side surface of the apparatus, a holding portion that holds sheets that are to be reversed, a second outlet portion that is disposed at an upper portion of the apparatus and that allows sheets to be discharged therethrough toward an upper side of the apparatus, a first switching member that changes a destination of a sheet transported thereto between the holding portion and the first outlet portion, and a second switching member that changes a destination of a sheet transported thereto between the second outlet portion and the holding portion or the first outlet portion to which the first switching member has changed the destination.Type: ApplicationFiled: September 8, 2017Publication date: September 20, 2018Applicant: FUJI XEROX CO., LTD.Inventors: Tomoya KOSUGE, Keita YANO, Masahito NIWA, Yuki KAWAZOE, Yoshinori SHUIN
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Publication number: 20170218232Abstract: Provided is a double-faced PSA sheet having excellent detergent resistance. The PSA sheet according to this invention comprises a PSA layer and is adhesive on both faces. The PSA sheet shows a push-peel strength of 30 N/cm2 or greater after a detergent immersion test involving immersion in a standard detergent at 40° C. for 24 hours. It also has an adhesive strength retention rate of 50% or higher, determined as the ratio of push-peel strength P2 after the detergent immersion test to push-peel strength P1 before the detergent immersion test.Type: ApplicationFiled: January 27, 2017Publication date: August 3, 2017Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Masataka NISHIWAKI, Noboru YOSHIDA, Naoaki HIGUCHI, Yutaka TOSAKI, Huairui ZHU, Junyi DING
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Publication number: 20160053140Abstract: A double-sided pressure-sensitive adhesive sheet includes a pressure-sensitive adhesive layer containing an acrylic polymer formed of a component comprising, as an essential monomer component, an alkyl (meth)acrylate having an alkyl group having 9 or less carbon atoms. A shear storage elastic modulus at 23° C. of the pressure-sensitive adhesive layer, which is measured by dynamic viscoelasticity measurement, is 5.0×105 Pa or less, and a shear storage elastic modulus at ?50° C. of the pressure-sensitive adhesive layer, which is measured by dynamic viscoelasticity measurement, is 1.0×108 Pa or more.Type: ApplicationFiled: August 31, 2015Publication date: February 25, 2016Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Kaori MIKI, Masato FUJITA, Takahiro NONAKA
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Publication number: 20150368516Abstract: A double-sided pressure-sensitive adhesive sheet includes a pressure-sensitive adhesive layer containing an acrylic polymer formed of a component comprising, as an essential monomer component, an alkyl (meth)acrylate having an alkyl group having 9 or less carbon atoms. A shear storage elastic modulus at 23° C. of the pressure-sensitive adhesive layer, which is measured by dynamic viscoelasticity measurement, is 5.0×105 Pa or less, and a shear storage elastic modulus at ?50° C. of the pressure-sensitive adhesive layer, which is measured by dynamic viscoelasticity measurement, is 1.0×108 Pa or more.Type: ApplicationFiled: August 31, 2015Publication date: December 24, 2015Applicant: NITTO DENKO CORPORATIONInventors: Masahito NIWA, Kaori MIKI, Masato FUJITA, Takahiro NONAKA
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Patent number: 8945710Abstract: Provided is an optical pressure-sensitive adhesive sheet which excels in whitening resistance and high-temperature bonding reliability and exhibits superior bump absorptivity. The optical pressure-sensitive adhesive sheet according to the present invention includes an acrylic pressure-sensitive adhesive layer and has a moisture content of 0.65 percent by weight or more after storage in an environment of 60° C. and 95 percent relative humidity for 120 hours, in which the acrylic pressure-sensitive adhesive layer contains an acrylic polymer and has a storage shear modulus at 23° C. of from 0.8×105 to 5.0×105 Pa, and the acrylic polymer is formed from, as an essential monomer component, a monomer that will form a homopolymer having a glass transition temperature of ?10° C. or higher.Type: GrantFiled: March 2, 2011Date of Patent: February 3, 2015Assignee: Nitto Denko CorporationInventors: Hiroaki Kishioka, Hiroaki Fumoto, Masayuki Okamoto, Masahito Niwa
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Patent number: 8920601Abstract: Disclosed is a method for detaching two plates bonded through a double-coated pressure-sensitive adhesive sheet without substantially applying such a force (load) to the plates as to cause large distortion (deformation) leading to fracture or breakage of the plates. The method detaches two plates bonded through a double-coated pressure-sensitive adhesive sheet by applying a force to at least one of the two plates at least in a direction normal to the plate at such a temperature that the double-coated pressure-sensitive adhesive sheet has a storage elastic modulus of 1.0×107 Pa or more as measured by dynamic viscoelastic measurement.Type: GrantFiled: November 9, 2012Date of Patent: December 30, 2014Assignee: Nitto Denko CorporationInventors: Kaori Miki, Masahito Niwa, Takahiro Nonaka, Masato Fujita
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Patent number: 8883926Abstract: An acrylic pressure-sensitive adhesive composition for optical use includes: an acrylic polymer (A) that contains, as a monomer unit, a vinyl monomer having a nitrogen atom in its backbone and that does not substantially contain a carboxyl group-containing monomer; and a (meth)acrylic polymer (B) having a weight average molecular weight of 1000 or more and less than 30000.Type: GrantFiled: September 13, 2012Date of Patent: November 11, 2014Assignee: Nitto Denko CorporationInventors: Masayuki Okamoto, Jun Akiyama, Kiyoe Shigetomi, Masahito Niwa, Masato Yamagata
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Publication number: 20140256877Abstract: A pressure-sensitive adhesive sheet containing a pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer has a melting point of ?60° C. to 0° C. The melting point can be measured by using the pressure-sensitive adhesive layer as a measurement sample according to differential scanning calorimetry (DSC) in conformity with JIS K 7121.Type: ApplicationFiled: March 7, 2014Publication date: September 11, 2014Applicant: NITTO DENKO CORPORATIONInventors: Kaori MIKI, Masahito NIWA, Masato FUJITA, Takahiro NONAKA
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Patent number: 8801881Abstract: A method of producing a flat panel display including step 1-step 4, or step 1-step 5, where at least one of the optical elements after step 4 or step 5 can be reused as an optical element in step 1: step 1: adhering two optical elements to each other via an adhesive sheet or a curable resin layer, and applying an autoclave treatment to give an optical laminate step 2: checking the appearance of the optical laminate obtained in step 1 step 3: assembling a flat panel display using the optical laminate that passed the check in step 2 step 4: separating the two optical elements in an optical laminate that was rejected by the check in step 2 by relatively rotating them with a vertical line penetrating the opposing faces thereof as a rotation axis step 5: washing the optical element resulting from step 4.Type: GrantFiled: March 11, 2013Date of Patent: August 12, 2014Assignee: Nitto Denko CorporationInventors: Takahiro Nonaka, Masato Fujita, Masahito Niwa, Kaori Miki
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Patent number: 8722185Abstract: The present invention provides a pressure-sensitive adhesive sheet large in adhesive force when used for a surface of a glass member and capable of reducing the adhesive force to a degree allowing the occurrence of the cracking or breakage of the glass member to be suppressed when the sheet is peeled from the surface of the glass member. The pressure-sensitive adhesive sheet for glass plates of the present invention includes a pressure-sensitive adhesive layer including an acrylic polymer, wherein the content of the acrylic polymer in the pressure-sensitive adhesive layer is 30% by weight or more in relation to the total amount (100% by weight) of the pressure-sensitive adhesive layer; the acrylic polymer substantially includes no acidic functional group; the solvent-insoluble fraction of the pressure-sensitive adhesive layer is 50% or more; and the adhesive force to glass as determined by a specific method is 12.0 N or less.Type: GrantFiled: December 27, 2012Date of Patent: May 13, 2014Assignee: Nitto Denko CorporationInventors: Masahito Niwa, Kaori Miki