Patents by Inventor Kazuma Mitsui

Kazuma Mitsui 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).

  • Publication number: 20170335144
    Abstract: An optical adhesive sheet having a lamination structure includes a first adhesive layer, a second adhesive layer, and a substrate located between the first and the second adhesive layers. The first adhesive layer has a thickness of 30 ?m or more and a storage modulus of 1.0×104 Pa or more at 95° C. The second adhesive layer has a loss tangent of 0.08 or more at 95° C. A polarizing film having a lamination structure including a polarizing film and the optical adhesive sheet. A liquid crystal display device having a multilayer structure including a resin-made covering member, a liquid crystal panel, and the optical adhesive sheet. In the liquid crystal display device, the optical adhesive sheet is attached to the resin-made covering member on the side of the first adhesive layer and attached to the polarizing film of the liquid crystal panel on the side of the second adhesive layer.
    Type: Application
    Filed: August 10, 2017
    Publication date: November 23, 2017
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuma MITSUI, Masato FUJITA, Takahiro NONAKA, Masahiro EHARA
  • Patent number: 9096781
    Abstract: An aim of the prevention invention is to provide a water dispersion type acryl-based pressure-sensitive adhesive composition for re-peeling, which can prevent electrification of an adherend at the time of peeling (peeling antistatic properties) and which can form a pressure-sensitive adhesive layer excellent in adherability and re-peelable properties, and also to provide a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition. The re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of a (meth)acrylic acid alkyl ester and a carboxyl-containing unsaturated monomer as raw material monomers, a perfluoroalkyl-containing oligomer, and an ionic compound.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: August 4, 2015
    Assignee: NITTO DENKO CORPORATION
    Inventors: Yu Morimoto, Kousuke Yonezaki, Tatsumi Amano, Kazuma Mitsui, Kyoko Takashima
  • Publication number: 20150037573
    Abstract: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property-imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in appearance characteristics, etc. A surface protective film has a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer (A) obtained by polymerization of an alkyl(meth)acrylate and a carboxyl group-containing unsaturated monomer with a reactive emulsifier having a radical polymerizable functional group; and a compound (B) represented by formula (I): R1O—(PO)a-(EO)b—(PO)c—R2 (I).
    Type: Application
    Filed: July 24, 2014
    Publication date: February 5, 2015
    Inventors: Tatsumi Amano, Kenjiro Niimi, Kazuma Mitsui
  • Publication number: 20150037572
    Abstract: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in removability etc. A surface protective film having: a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer obtained by polymerization of an alkyl (meth)acrylate (A) and a carboxyl group-containing unsaturated monomer (B) with a reactive emulsifier.
    Type: Application
    Filed: July 24, 2014
    Publication date: February 5, 2015
    Inventors: Tatsumi Amano, Kenjiro Niimi, Kazuma Mitsui
  • Publication number: 20150037574
    Abstract: Provided is a surface protective film, which has a substrate having a topcoat layer containing a lubricating property imparting component and rarely whitened and an adhesive layer formed of a water dispersible acrylic adhesive composition, and which is excellent in appearance characteristics etc. A surface protective film having: a substrate; and a topcoat layer and an acrylic adhesive layer formed on respective faces of the substrate, in which the topcoat layer contains a lubricant wax composed of a higher fatty acid/higher alcohol ester and a polyester binder resin, the acrylic adhesive layer is formed of a water dispersible acrylic adhesive composition containing an acrylic emulsion polymer (A) obtained by polymerization of an alkyl (meth)acrylate and a carboxyl group-containing unsaturated monomer with a reactive emulsifier, a compound (B) represented by formula (I): RaO—(PO)l-(EO)m—(PO)n—Rb??(I) and, an acetylene diol compound (C).
    Type: Application
    Filed: July 24, 2014
    Publication date: February 5, 2015
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Kenjiro Niimi, Kazuma Mitsui
  • Publication number: 20150024199
    Abstract: There is provided a removable water-dispersible pressure-sensitive adhesive composition to form a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet capable of exhibiting good curl regulatability. There are also provided a pressure-sensitive adhesive sheet capable of exhibiting good curl regulatability, and an optical component having the pressure-sensitive adhesive sheet laminated thereon. The removable water-dispersible pressure-sensitive adhesive composition according to the present invention forms a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet having an initial curl height of not less than 20 mm as determined by a curl test, and a difference in curl height of not more than 10 mm as determined by the curl test. The pressure-sensitive adhesive sheet according to the present invention has a pressure-sensitive adhesive layer formed of the removable water-dispersible pressure-sensitive adhesive composition.
    Type: Application
    Filed: July 14, 2014
    Publication date: January 22, 2015
    Inventors: Yu Morimoto, Kazuma Mitsui, Tatsumi Amano
  • Patent number: 8906989
    Abstract: A pressure-sensitive adhesive layer contains a base polymer and has properties of (1) and (2) below: in a case where a pressure-sensitive adhesive sheet A is laminated to an adherend X surface, they are left to stand at a temperature of 23° C. and a humidity of 30% for 12 hours, and the pressure-sensitive adhesive sheet A is then separated, (1) a water contact angle A on the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is 70° or less, and (2) a pressure-sensitive adhesive strength of a pressure-sensitive adhesive tape B with respect to the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is higher than that of the pressure-sensitive adhesive tape B with respect to the adherend X surface not subjected to any treatment.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: December 9, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Natsuko Watanabe, Kazuma Mitsui, Tatsumi Amano, Kenjiro Niimi
  • Publication number: 20140342152
    Abstract: An object of the invention to provide a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that can prevent static build-up on adherends when peeled off (antistatic properties) and is superior not only in removability and the ability to prevent an increase in peel strength (adhesive strength) over time but also in less-staining properties on adherends and, especially, the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining). The invention is directed to a removable water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including units derived from raw material monomers including (i) 70 to 99.5% by weight of an alkyl(meth)acrylate and (ii) 0.5 to 10% by weight of a carboxyl group-containing unsaturated monomer; a non-water-soluble crosslinking agent; and an ionic compound.
    Type: Application
    Filed: October 12, 2012
    Publication date: November 20, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kousuke Yonezaki, Kyoko Takashima
  • Publication number: 20140308516
    Abstract: Provided is a removable water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that is superior in antistatic properties (resistance to peeling-induced static build-up), removability, adhesion (adhesive properties), and the ability to prevent an increase in peel strength (adhesive strength) over time and also superior in less-staining properties on adherends, particularly, the ability to prevent white staining on adherends in a high-humidity environment. Also provided is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer made from such a pressure-sensitive adhesive composition. The removable water-dispersible acrylic pressure-sensitive adhesive composition contains an acrylic emulsion polymer including units derived from raw material monomers including at least (A) an alkyl (meth)acrylate and (B) 0.
    Type: Application
    Filed: October 12, 2012
    Publication date: October 16, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kousuke Yonezaki, Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kyoko Takashima
  • Publication number: 20140302314
    Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition which can form a pressure-sensitive adhesive layer excellent in antistatic property, repeeling property (light peeling property), and appearance property. The repeelable water-dispersible acrylic pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of 70 to 99.5% by weight of a (meth)acrylic acid alkyl ester and 0.5 to 10% by weight of a carboxyl group-containing unsaturated monomer as monomer components, a crosslinking agent, an ionic compound, and a nonionic surfactant with an HLB value of 6 or more.
    Type: Application
    Filed: April 8, 2014
    Publication date: October 9, 2014
    Inventors: Kyoko Takashima, Yu Morimoto, Kazuma Mitsui, Kousuke Yonezaki, Tsunaki Kitahara
  • Publication number: 20140296401
    Abstract: A pressure-sensitive adhesive layer contains a base polymer and has properties of (1) and (2) below: in a case where a pressure-sensitive adhesive sheet A is laminated to an adherend X surface, they are left to stand at a temperature of 23° C. and a humidity of 30% for 12 hours, and the pressure-sensitive adhesive sheet A is then separated, (1) a water contact angle A on the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is 70° or less, and (2) a pressure-sensitive adhesive strength of a pressure-sensitive adhesive tape B with respect to the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is higher than that of the pressure-sensitive adhesive tape B with respect to the adherend X surface not subjected to any treatment.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 2, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Natsuko WATANABE, Kazuma MITSUI, Tatsumi AMANO, Kenjiro NIIMI
  • Publication number: 20140272408
    Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that can prevent static build-up at the time of peeling (antistatic properties), is superior in removability, in the ability to prevent an increase in peel strength (adhesive strength) over time among the adhesive properties, as well as in appearance properties (decrease of appearance defects due to dents or the like), and also in less-staining properties on adherends, particularly, in the ability to prevent white staining on adherends in high-humidity environments (the ability to prevent white staining).
    Type: Application
    Filed: October 12, 2012
    Publication date: September 18, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kousuke Yonezaki, Kyoko Takashima
  • Publication number: 20140255690
    Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that is superior in adhesive properties, antistatic properties, removability, the ability to prevent an increase in peel strength (adhesive strength) over time, and superior in less-staining properties on adherends, particularly, in the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining), and also superior in appearance properties. The invention is directed to a water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including 70 to 99.5% by weight of a monomer unit derived from an alkyl (meth)acrylate and 0.
    Type: Application
    Filed: October 12, 2012
    Publication date: September 11, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kousuke Yonezaki, Kyoko Takashima
  • Publication number: 20140248490
    Abstract: Provided is a removable water-dispersible acrylic pressure-sensitive adhesive composition with which it is possible to form a pressure-sensitive adhesive layer that has excellent antistatic properties, adhesive properties, removability, removal stability, and the ability to prevent an increase in adhesive strength over time, less-staining properties on adherends, especially, the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining), and appearance properties. The present invention is directed to a removable water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including 70 to 99.5% by weight of a monomer unit derived from an alkyl(meth)acrylate and 0.5 to 10% by weight of a monomer unit derived from a carboxyl group-containing unsaturated monomer; an ionic compound; and a polyether antifoamer represented by formula (I) below.
    Type: Application
    Filed: October 12, 2012
    Publication date: September 4, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Yu Morimoto, Tatsumi Amano, Kazuma Mitsui, Kousuke Yonezaki, Kyoko Takashima
  • Publication number: 20140242384
    Abstract: The present invention provides an acrylic water-dispersible pressure-sensitive adhesive composition that can prepare a removable adhesive layer having low contamination of an adherent. The acrylic water-dispersible pressure-sensitive removable adhesive composition according to the present invention comprises an acrylic emulsion polymer (A) comprising an alkyl (meth)acrylate ester and a carboxyl group-containing unsaturated monomer as essential raw material constitutive monomers and prepared by polymerization with a reactive surfactant containing no oxyalkylene group.
    Type: Application
    Filed: October 15, 2012
    Publication date: August 28, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kyoko Takashima, Kazuma Mitsui, Yu Morimoto, Tatsumi Amano, Kousuke Yonezaki
  • Publication number: 20140037911
    Abstract: Disclosed is a pressure-sensitive adhesive sheet having a transparent film substrate and, on at least one side thereof, an acrylic pressure-sensitive adhesive layer. The transparent film substrate has a top coat layer having a specific configuration with an average thickness and a thickness variation being controlled. The acrylic pressure-sensitive adhesive layer is formed from a water-dispersible acrylic pressure-sensitive adhesive composition. The composition contains, as components, an acrylic emulsion polymer derived from constitutive monomers in a specific formulation; and a polypropylene glycol (PPG)/polyethylene glycol (PEG) block copolymer having a specific structure, or a derivative of the copolymer. The pressure-sensitive adhesive sheet is found to be highly resistant to scratches and static electrification and to have superior visual quality and satisfactory resistance to adhesive strength increase.
    Type: Application
    Filed: April 6, 2012
    Publication date: February 6, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kyoko Takashima
  • Publication number: 20140037950
    Abstract: The pressure-sensitive adhesive sheet includes a transparent film substrate; and, on at least one side thereof, an acrylic pressure-sensitive adhesive layer. The transparent film substrate includes a base layer including a resinous material and a top coat layer on a first face of the base layer. The top coat layer is formed from a polythiophene, an acrylic resin, and a melamine crosslinking agent and has an average thickness Dave of 2 to 50 nm and a thickness variation ?D of 40% or less. The acrylic pressure-sensitive adhesive layer is formed from a water-dispersible removable acrylic pressure-sensitive adhesive composition including an acrylic emulsion polymer.
    Type: Application
    Filed: April 6, 2012
    Publication date: February 6, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kousuke Yonezaki, Kyoko Takashima
  • Publication number: 20140030515
    Abstract: An aim of the prevention invention is to provide a re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition, which can prevent electrification at the time of peeling off under low humidity environments (an antistatic property for peeling off in low humidity) independently of an adherend and which can form a pressure-sensitive adhesive layer excellent in adherability and re-peelable properties. The re-peelable water dispersion type acryl-based pressure-sensitive adhesive composition of the present invention contains an acrylic emulsion-based polymer composed of a (meth)acrylic acid alkyl ester in an amount of 70 to 99.5% by weight and a carboxyl-containing unsaturated monomer in an amount of 0.5 to 10% by weight as raw material monomers, a crosslinking agent, and an ionic compound, wherein the acrylic emulsion-based polymer has an average particle diameter of 130 to 550 nm.
    Type: Application
    Filed: July 26, 2013
    Publication date: January 30, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Yu MORIMOTO, Kazuma MITSUI, Tatsumi AMANO, Kousuke YONEZAKI
  • Publication number: 20140030511
    Abstract: Disclosed is a pressure-sensitive adhesive sheet that has a transparent film substrate and, on at least one side thereof, an acrylic pressure-sensitive adhesive layer. The transparent film substrate has a top coat layer having a specific configuration with an average thickness and a thickness variation being controlled. The acrylic pressure-sensitive adhesive layer is formed from a water-dispersible acrylic pressure-sensitive adhesive composition. The composition includes, as components, an acrylic emulsion polymer derived from constitutive monomers in a specific formulation; a polyether compound having a specific structure; and a specific acetylenic diol. The pressure-sensitive adhesive sheet is found to be highly resistant to scratches and static electrification, to have superior visual quality and satisfactory resistance to adhesive strength increase, and to less cause stains.
    Type: Application
    Filed: April 6, 2012
    Publication date: January 30, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Tatsumi Amano, Yu Morimoto, Kazuma Mitsui, Kyoko Takashima
  • Publication number: 20140030519
    Abstract: An aim of the present invention is to provide a pressure-sensitive adhesive sheet excellent in antistatic property, re-peelable property, and adherability (tackiness). A pressure-sensitive adhesive sheet according to the present invention includes a substrate and a pressure-sensitive adhesive layer on at least one surface of the substrate, wherein the pressure-sensitive adhesive layer is formed of a water dispersion type acryl-based pressure-sensitive adhesive composition containing an acrylic emulsion-based polymer containing at least 70 to 99.5% by weight of a (meth)acrylic acid alkyl ester (A) and 0.
    Type: Application
    Filed: July 26, 2013
    Publication date: January 30, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Yu MORIMOTO, Kousuke YONEZAKI, Tatsumi AMANO, Kazuma MITSUI