Patents by Inventor Toshitsugu Hosokawa

Toshitsugu Hosokawa 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).

  • Patent number: 10266629
    Abstract: 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: Grant
    Filed: May 16, 2011
    Date of Patent: April 23, 2019
    Assignee: NITTO DENKO CORPORATION
    Inventors: 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
  • Publication number: 20160289516
    Abstract: 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: Application
    Filed: June 10, 2014
    Publication date: October 6, 2016
    Applicant: NITTO DENKO CORPORATION
    Inventors: Yousuke Makihata, Kenichi Okada, Toshitaka Takahashi, Kayo Shimokawa, Taiki Shimokuri, Toshitsugu Hosokawa, Kunihiro Inui
  • Publication number: 20160264826
    Abstract: Provided are a pressure-sensitive adhesive layer-carrying optical member having good antistatic properties, having high tackiness between an optical member and a pressure-sensitive adhesive layer made from a water-dispersible pressure-sensitive adhesive composition, and allowing the pressure-sensitive adhesive layer to have high durability; an image display device including such a pressure-sensitive adhesive layer-carrying optical member; and a method for producing such a pressure-sensitive adhesive layer-carrying optical member, in which the pressure-sensitive adhesive layer-carrying optical member includes a pressure-sensitive adhesive layer made from a water-dispersible pressure-sensitive adhesive composition, an anchor layer made from an anchor-layer-forming coating liquid, and an optical member, wherein the anchor-layer-forming coating liquid includes a polythiophene based polymer, an oxazoline group-containing polymer, and an aqueous solvent including 60% by weight or more of water, and the anchor layer
    Type: Application
    Filed: August 1, 2014
    Publication date: September 15, 2016
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kayo Shimokawa, Toshitaka Takahashi, Yousuke Makihata, Kenichi Okada, Toshitsugu Hosokawa, Masakuni Fujita
  • Patent number: 9409198
    Abstract: The invention is a method, an apparatus, and a coated product-manufacturing method each capable of applying a coating solution to a flexible backing sheet using a die coater while preventing contaminants from forming defects. A virtual line L is drawn to pass through the discharge port 74 of the die coater 7 and to extend perpendicular to the backing sheet 1, the distance D1 between a starting line P1 and a boundary line P2 is 50 mm or less, and the distance between the starting line P1 and a line on the roller P3 is 5 ?m or more.
    Type: Grant
    Filed: November 24, 2011
    Date of Patent: August 9, 2016
    Assignee: NITTO DENKO CORPORATION
    Inventors: Toshitsugu Hosokawa, Keiichi Okamoto, Satoru Yamamoto
  • Publication number: 20160215182
    Abstract: It is an object of the invention to provide a water-dispersible pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer having removability and a sufficient level of adhesion reliability and to provide a pressure-sensitive adhesive layer made from such a water-dispersible pressure-sensitive adhesive composition. It is another object of the invention to provide a pressure-sensitive adhesive optical film including an optical film and such a pressure-sensitive adhesive layer provided on at least one side of the optical film and to provide an image display device having such a pressure-sensitive adhesive optical film. The present invention relates to a water-dispersible pressure-sensitive adhesive composition, comprising emulsion particles each having a core-shell structure in which (A) a (meth)acryl copolymer forms a core layer and (B) another (meth)acryl copolymer forms a shell layer, wherein the (meth)acryl copolymer (B) has a glass transition temperature of ?10° C.
    Type: Application
    Filed: February 7, 2014
    Publication date: July 28, 2016
    Applicant: NITTO DENKO CORPORATION
    Inventors: Toshitaka Takahashi, Yousuke Makihata, Kayo Shimokawa, Mizuho Nagata, Kenichi Okada, Toshitsugu Hosokawa
  • Publication number: 20160130478
    Abstract: A pressure-sensitive adhesive composition for an optical film, includes a (meth)acryl-based polymer obtained by polymerization of a monomer component including, as a main component, an alkyl(meth)acrylate having an alkyl group of 4 to 18 carbon atoms; and a phosphate ester compound. The pressure-sensitive adhesive composition is capable of forming a pressure-sensitive adhesive layer for optical films. The pressure-sensitive adhesive layer that is for use on optical films and makes it possible to suppress an increase in the surface resistance of a transparent conductive layer even when a laminate including a transparent conductive layer and an optical film such as a polarizing plate with the pressure-sensitive adhesive layer interposed therebetween is stored under hot and humid conditions.
    Type: Application
    Filed: June 24, 2014
    Publication date: May 12, 2016
    Applicant: NITTO DENKO CORPORATION
    Inventors: Mizuho Nagata, Toshitaka Takahashi, Yousuke Makihata, Kayo Shimokawa, Kenichi Okada, Toshitsugu Hosokawa
  • Publication number: 20150353787
    Abstract: It is an object of the invention to provide a water-dispersible pressure-sensitive adhesive composition that is suitable for use on a transparent conductive layer and capable of forming a pressure-sensitive adhesive layer effective in suppressing the corrosion of various adherends such as transparent conductive thin coatings, in particular, effective in suppressing the corrosion in a high-temperature environment and a high-temperature, high-humidity environment, and capable of providing good optical properties on a transparent conductive layer.
    Type: Application
    Filed: December 20, 2013
    Publication date: December 10, 2015
    Applicant: NITTO DENKO CORPORATION
    Inventors: Mizuho Nagata, Kenichi Okada, Toshitaka Takahashi, Yousuke Makihata, Kayo Shimokawa, Toshitsugu Hosokawa
  • Patent number: 9188722
    Abstract: The present invention aims at providing an antistatic pressure-sensitive adhesive optical film exhibiting excellent antistatic effect, optical properties, and water resistance and having excellent adhesion between the antistatic layer and the pressure-sensitive adhesive layer. An antistatic pressure-sensitive adhesive optical film, the optical film having an antistatic layer laminated on at least one side of the optical film, and a pressure-sensitive adhesive layer further laminated on the antistatic layer, wherein the antistatic layer comprises a conductive polymer and a sulfonic acid compound as raw material components, and the pressure-sensitive adhesive layer is formed of an acryl-based pressure-sensitive adhesive containing nitrogen.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: November 17, 2015
    Assignee: Nitto Denko Corporation
    Inventors: Shinichi Inoue, Masayuki Satake, Toshitsugu Hosokawa, Akiko Ogasawara
  • Patent number: 9181458
    Abstract: 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: Grant
    Filed: September 25, 2012
    Date of Patent: November 10, 2015
    Assignee: NITTO DENKO CORPORATION
    Inventors: Taiki Shimokuri, Kunihiro Inui, Toshitaka Takahashi, Yousuke Makihata, Toshitsugu Hosokawa, Takaaki Ishii
  • Publication number: 20150203720
    Abstract: A pressure-sensitive adhesive optical film of the invention includes an optical film; and a pressure-sensitive adhesive layer placed on at least one side of the optical film, wherein the pressure-sensitive adhesive layer is a product formed by applying a pressure-sensitive adhesive coating liquid having a dissolved oxygen concentration of 0.02 to 3 mg/L and then drying the pressure-sensitive adhesive coating liquid. The pressure-sensitive adhesive optical film can satisfy heat durability, humidity durability, and high contrast.
    Type: Application
    Filed: March 30, 2015
    Publication date: July 23, 2015
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kunihiro Inui, Masayuki Satake, Toshitsugu Hosokawa, Takaaki Ishii, Yoshiaki Kitani, Toshitaka Takahashi, Yousuke Makihata, Yoshihiro Kitamura
  • Publication number: 20150132567
    Abstract: 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: Application
    Filed: April 16, 2013
    Publication date: May 14, 2015
    Applicant: NITTO DENKO CORPORATION
    Inventors: Taiki Shimokuri, Kunihiro Inui, Toshitaka Takahashi, Yousuke Makihata, Toshitsugu Hosokawa, Takaaki Ishii
  • Patent number: 9029468
    Abstract: 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: Grant
    Filed: November 18, 2011
    Date of Patent: May 12, 2015
    Assignee: Nitto Denko Corporation
    Inventors: Kunihiro Inui, Toshitsugu Hosokawa, Takaaki Ishii, Masayuki Satake, Kenichi Okada, Toshitaka Takahashi, Taiki Shimokuri, Yousuke Makihata
  • Patent number: 8980436
    Abstract: A pressure-sensitive adhesive optical film of the present invention comprises an optical film; and a pressure-sensitive adhesive layer laminated on at least one side of the optical film, wherein the pressure-sensitive adhesive layer is formed from an acrylic pressure-sensitive adhesive comprising a (meth)acrylic polymer comprising 30 to 99.99% by weight of an alkyl(meth)acrylate monomer unit and 0.01 to 15% by weight of a functional group-containing monomer unit, and the (meth)acrylic polymer in the acrylic pressure-sensitive adhesive is crosslinked by electron beam irradiation. The pressure-sensitive adhesive optical film has a high level of reworkability, durability and workability.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: March 17, 2015
    Assignee: Nitto Denko Corporation
    Inventors: Yuusuke Toyama, Shinichi Inoue, Mizue Nagata, Toshitsugu Hosokawa
  • Patent number: 8962135
    Abstract: A pressure-sensitive adhesive composition for an optical film of the present invention comprises 100 parts by weight of a (meth)acrylic polymer comprising 45 to 99.99% by weight of an alkyl (meth)acrylate monomer unit and 0.01 to 2% by weight of a tertiary amino group-containing monomer unit; and 0.01 to 2 parts by weight of a peroxide as a crosslinking agent. The pressure-sensitive adhesive composition can form an pressure-sensitive adhesive layer that has satisfactory reworkability such that optical films can be easily peeled from liquid crystal panels with no adhesive residue and also has satisfactory processability such that it can be worked without pressure-sensitive adhesive fouling or dropout.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: February 24, 2015
    Assignee: Nitto Denko Corporation
    Inventors: Shinichi Inoue, Yuusuke Toyama, Mizue Nagata, Toshitsugu Hosokawa, Yutaka Moroishi, Fumiko Nakano
  • Publication number: 20140347727
    Abstract: A pressure-sensitive adhesive layer-attached optical film of the present invention comprises an optical film; and a pressure-sensitive adhesive layer and made from an ammonia-containing water-dispersible pressure-sensitive adhesive, wherein the pressure-sensitive adhesive layer has an ammonia content of 10 to 500 ?g per 1 g of the pressure-sensitive adhesive layer, and shows a difference of 0 to 500 ?g per 1 g of the pressure-sensitive adhesive layer in ammonia content before and after a heat durability test and humidity durability test, and the optical film includes a polarizing film with a degree of polarization of 99.99% or more. The pressure-sensitive adhesive layer-attached optical film has optical properties which are less changeable even in a high-temperature and/or high-humidity environment.
    Type: Application
    Filed: January 8, 2013
    Publication date: November 27, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kunihiro Inui, Takaaki Ishii, Kazuki Murayama, Toshitsugu Hosokawa, Masayuki Satake
  • Patent number: 8883251
    Abstract: An antistatic optical film comprising an antistatic layer laminated on at least one side of an optical film, wherein the antistatic layer comprises a water soluble or a water dispersible conductive polymer, has excellent antistatic effect, optical characteristics and appearance.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: November 11, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Masayuki Satake, Akiko Ogasawara, Fumiaki Shirafuji, Toshitsugu Hosokawa, Shinichi Inoue
  • Patent number: 8784987
    Abstract: A pressure-sensitive adhesive layer for optical films. The pressure-sensitive adhesive layer can prevent light leakage caused by stress associated with dimensional change of a component such as an optical film, that has reworkability, and that has satisfactory processability. A pressure-sensitive adhesive optical film produced using the layer is also provided. The pressure-sensitive adhesive layer is prepared with the use of a composition which includes a (meth)acrylic polymer including (a) 34 to 94% by weight of an alkyl (meth)acrylate monomer unit, (b) 5 to 50% by weight of an aromatic ring-containing (meth)acrylate monomer unit, and (c) 0.01 to 0.5% by weight of an amino group-containing (meth)acrylate monomer unit; 0.01 to 2 parts by weight of a peroxide as a crosslinking agent; and 0.01 to 2 parts by weight of a silane coupling agent based on 100 parts by weight of the (meth)acrylic polymer.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: July 22, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Yuusuke Toyama, Shinichi Inoue, Mizue Nagata, Toshitsugu Hosokawa
  • Patent number: 8709597
    Abstract: There is provided a pressure-sensitive adhesive composition for optical films. The composition can form a pressure-sensitive adhesive layer that can prevent light leakage caused by stress associated with dimensional change of a component such as an optical film, which include the pressure-sensitive adhesive layer that has reworkability such that it can be easily peeled from a component, and that has satisfactory processability such that it can be processed without pressure-sensitive adhesive stain or dropout, after it is formed on an optical film. A pressure-sensitive adhesive optical film produced using the composition is also provided. The pressure-sensitive adhesive composition includes a (meth)acrylic polymer including (a) 34 to 94% by weight of an alkyl (meth)acrylate monomer unit, (b) 5 to 35% by weight of an aromatic ring-containing (meth)acrylate monomer unit, and (c) 0.01 to 0.5% by weight of an amino group-containing (meth)acrylate monomer unit and further including (d) 0.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: April 29, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Yuusuke Toyama, Shinichi Inoue, Mizue Nagata, Toshitsugu Hosokawa
  • Patent number: 8703297
    Abstract: The present invention aims at providing an antistatic optical film having excellent antistatic effect and high light transmittance, wherein an antistatic layer laminated on at least one side of the optical film. An antistatic optical film having an antistatic layer laminated on at least one side of the optical film, wherein rubbing treatment is performed on a surface of the optical film on which the antistatic layer is laminated, and a conductive polymer in the antistatic layer is aligned.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: April 22, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Shinichi Inoue, Masayuki Satake, Toshitsugu Hosokawa, Akiko Ogasawara, Akira Ootani
  • Patent number: 8685204
    Abstract: An object of the invention is to provide a pressure-sensitive adhesive optical film-peeling method capable of easily detaching the pressure-sensitive adhesive optical film from a glass substrate with no damage to the glass substrate or no adhesive deposit on the glass substrate, and to provide a pressure-sensitive adhesive optical film suitable for use in such a peeling method. The invention is directed to a method for peeling a pressure-sensitive adhesive optical film from an optical film-carrying glass substrate including a glass substrate and the pressure-sensitive adhesive optical film bonded thereto, which includes: exposing the optical film-carrying glass substrate to an environment at a temperature of 40 to 98° C. and a relative humidity of 60 to 99% for three minutes or more; and then peeling the pressure-sensitive adhesive optical film from the glass substrate under the environment.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: April 1, 2014
    Assignee: Nitto Denko Corporation
    Inventors: Fumiko Nakano, Yutaka Moroishi, Aimi Matsuura, Toshitsugu Hosokawa, Akiko Tanaka