Patents Assigned to Tomoegawa Paper Co.
  • Patent number: 6265042
    Abstract: An adhesive tape for electronic parts of the present invention is characterized by comprising a heat resisting film and an adhesive layer provided on at least a side of said heat resisting film, said adhesive layer contains at least a polyimide comprising 100-30% by mol of at least one of the repeating units represented by the following formulas (1a) and (1b) and 0-70% by mol of at least one of the repeating unit represented by the following formulas (2a) and (2b) and 0.1-15 parts by weight of a silane coupling agent based on 100 parts by weight of said polyimide: wherein Ar represents a specified divalent aromatic group wherein R is an alkylene group having 1 to 10 carbon atoms or —CH2OC6H4—, the methylene group of which attaches to Si, and n means an integer of 1 to 20.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: July 24, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Osamu Oka, Takeshi Nishigaya
  • Patent number: 6264357
    Abstract: A method of suspension polymerization of a monomeric composition to produce a polymer or a polymer composition is disclosed which method comprises the steps of retaining a disperse phase component composed of the monomeric composition and a continuous phase component composed of a medium in independent vessels, supplying the disperse phase component and the continuous phase component from their respective vessels into a disperser simultaneously and continuously through associated independent passageways, applying shear force in the disperser to form a dispersion having droplets of a desired size, subsequently introducing the dispersion into a polymerization vessel, and completing a polymerizating reaction to produce a polymer or a polymer composition.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: July 24, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masafumi Kamiyama, Haruhiko Yano, Minoru Tsuchida, Eiji O'Shima
  • Patent number: 6261665
    Abstract: The present invention provides an anti-reflection material and a polarizing film which can exhibit excellent anti-reflection properties and can obtain a visible image without glittering and without reducing an image contrast while exhibiting an excellent wear resistance and chemical resistance, as well as, exhibiting an excellent stain resistance. A surface-roughened layer (12) is provided on one surface or double surfaces of a transparent substrate (11) directly or via another layer, and the surface-roughened layer (12) comprises an ultraviolet-curing resin comprising at least an epoxy compound and a photo-cationic polymerization initiator.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: July 17, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Chikara Murata, Kazuya Ohishi, Yasuhiro Matsunaga, Kazuhiro Yamasaki, Yukinori Sakumoto
  • Patent number: 6261684
    Abstract: The present invention provides an infrared ray blocking transparent film which can be produced at low cost despite using indium tin oxide powder (which can inhibit metallic luster) and which can exhibit excellent electromagnetic wave transmissivity. An infrared ray blocking layer is provided on at least a surface of a base film, and the infrared ray blocking layer includes indium tin oxide powder and resin in a weight ratio of 90/10 to 60/40.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: July 17, 2001
    Assignee: Tomoegawa Paper Co., LTD
    Inventors: Shinichi Takahashi, Kazunori Ikegaya
  • Patent number: 6256187
    Abstract: An electrostatic chuck device is characterized in the provision of a ceramic layer, which serves as an adsorption surface, via an electricity insulating elastic layer, and an electrode that is formed between the ceramic layer and the electricity insulating elastic layer. The electricity insulating elastic layer consists of an adhesive that contains a rubber component and a phenol-type antioxidant. This electrostatic chuck device does not easily experience wear or deformation, and has extremely high durability. The electricity insulating elastic layer relieves stress caused by differences in coefficients of thermal expansion during heating, or by slight volume changes in the resin material. As a result, the stress applied on the ceramic layer can be reduced, making it possible to limit a reduction in the degree of flatness and the like.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: July 3, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Tadao Matsunaga, Masaharu Kobayashi
  • Patent number: 6245422
    Abstract: A recording medium which can prevent a failure of the recording medium to be fed or carried in a printer without sacrificing the glossiness is disclosed. Addition of a mixture of a spherical silica with a nonspherical silica to a gloss surface layer of a recording medium realizes good glossiness with good feedability and carriability in a printer.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: June 12, 2001
    Assignee: Seiko Epson Corporation & Tomoegawa Paper Co., Ltd.
    Inventors: Hiroyuki Onishi, Masaaki Itano, Kiyoshi Iwamoto, Senichi Yoshizawa
  • Patent number: 6228509
    Abstract: The present invention provides a thin and flexible electromagnetic wave shielding material having excellent electromagnetic wave shielding properties and mainly usable in electronic equipment. The electromagnetic wave shielding sheet according to the present invention is composed of a porous sheet containing one or plural kinds of metallic fibers, or a sintered porous sheet obtained by sintering the above porous sheet. The sheet has a thickness of 10 to 100 &mgr;m. a porosity of 70 to 95% and Gurley stiffness of 5 to 50 mg. The sheet can be made by, for example, using stainless steel fiber as the metallic fiber in accordance with a wet paper making process.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: May 8, 2001
    Assignee: Tomoegawa Paper Co., Ltd
    Inventors: Yasuharu Mizumoto, Tomoyuki Nakada, Toshiaki Suzuki
  • Patent number: 6228452
    Abstract: This invention provide an adhesive tape for electronic parts having sufficient thermal resistance and reliability. The adhesive tape comprises a metal substrate, an adhesive layer A and an adhesive layer B laminated in order, wherein said adhesive layers A and B are resin layers composed of 100-40% by mol of at least a polyimide comprising the repeating unit represented by the formula (1) and 0-60% by mol of the repeating unit represented by the formula (2), said two adhesive layers having each a different glass transition temperature: wherein X is —SO2— and/or —C(=O)—OCH2CH2O—C(=O)—, Ar is a divalent group containing aromatic rings, and R is an alkylene group having 1 to 10 carbon atoms or —CH2OC6H4—, and n means an integer of 1 to 20.
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: May 8, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Osamu Oka, Takeshi Nishigaya, Jun Tochihira, Fumiki Komagata
  • Patent number: 6207261
    Abstract: Disclosed is an electrical insulating laminated paper prepared by a process which comprises the steps of melt-extruding a polyolefin resin as a binder onto one or two sheets of a kraft insulating paper by means of a extruder to obtain a laminated paper, and calendering or supercalendering the laminated paper so that the total thickness thereof is from 30 to 200 &mgr;m and the proportion of a polymer comprising the polyolefin resin is from 40 to 90%. The laminated paper is excellent in dielectric properties, dielectric strength, and mechanical properties such as adhesive strength.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: March 27, 2001
    Assignees: Tomoegawa Paper Co., Sumitomo Electric Industries, Ltd.
    Inventors: Hidemitsu Kuwabara, Katsuhiko Katayama, Toru Tsujioka, Ryosuke Hata, Hiroshi Takigawa, Jun Yorita
  • Patent number: 6200720
    Abstract: A graft resin having a structure of the formula (1) and having a number average molecular weight of 2,000 to 50,000, has excellent low-temperature moldability and exhibits an excellent shelf life against softening when stored at high temperatures, and an electrostatic charge developing toner containing the above graft resin as a binder exhibits excellent low-temperature fixing properties, developability and transferability without impairing the shelf life.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: March 13, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventor: Toshio Tagami
  • Patent number: 6194113
    Abstract: The object of the present invention is to provide new resins having excellent compatibility with other resins, in addition to a low melting temperature, and a low viscosity, and to provide a toner which can be fixed at low temperature without losing its shelf life, and showing an offset phenomenon, and have an excellent fixing strength to a transfer paper by using the improved olefin resin as a binder resin; these objects can be achieved by an olefin resin which is a copolymer of an &agr;—olefin and at least one constituent selected from the group consisting of maleic anhydride and maleate, wherein said at least one constituent selected from the group consisting of maleic anhydride and maleate is crosslinked, and by rev toners comprising the same.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: February 27, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventor: Haruo Okutani
  • Patent number: 6191884
    Abstract: An infrared ray blocking transparent film which can be very thin and have greater transparency and higher adhesion than that of conventional films; the cost for forming the film can be lower due to the reduced amounts of forming materials used for the infrared ray blocking layer, is disclosed. An infrared ray blocking layer is provided on a surface of a base film, by coating conductive materials including indium tin oxide powder and resin; a hard coat layer is provided on a surface of the infrared ray blocking layer; an adhesive layer is provided on a rear surface of the base film. Since resin employed in the infrared ray blocking layer is UV-curing resin including photo-cationic polymerization initiator, thickness of the layer is reduced, and transparency and adhesion thereof are improved.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: February 20, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Tsuyoshi Takizawa, Shinichi Takahashi
  • Patent number: 6187874
    Abstract: The invention provides an adhesive for electronic parts, which satisfies both points of heat resistance and the ability to form an adhesive layer, and of low-temperature adhesive property, and an adhesive tape for electronic parts making use of such an adhesive. The adhesive comprises, as a resin component, two polyimide resins different in glass transition temperature by at least 20° C. from each other, and an epoxy resin.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: February 13, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Ken Yoshioka, Hitoshi Narushima, Osamu Oka
  • Patent number: 6184337
    Abstract: The present invention provide a novel polyimide which is soluble in organic solvents and excels in heat resistance, and to a process for producing the polyimide. The polyimide of the present invention comprises a repeating unit represented by the formula (1) and having a number average molecular weight of from 4,000 to 200,000. wherein X is —SO2— or —C(═O)—OCH2CH2O—C(═O)—, and R1, R2, R3 and R4 are independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
    Type: Grant
    Filed: October 26, 1998
    Date of Patent: February 6, 2001
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Osamu Oka, Takeshi Nishigaya, Fumiyoshi Yamanashi
  • Patent number: 6166897
    Abstract: The static chuck apparatus includes a metal substrate, a first adhesive layer provided on the metal substrate, a ceramic insulating plate provided on the first adhesive layer, a second adhesive layer provided on the ceramic insulating plate, an insulating film provided on the second adhesive layer, and an electrode provided between the second adhesive layer and the insulating film.
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: December 26, 2000
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventor: Tadao Matsunaga
  • Patent number: 6140394
    Abstract: A method of suspension polymerization of a monomeric composition to produce a polymer or a polymer composition is disclosed which method comprises the steps of retaining a disperse phase component composed of the monomeric composition and a continuous phase component composed of a medium in independent vessels, supplying the disperse phase component and the continuous phase component from their respective vessels into a disperser simultaneously and continuously through associated independent passageways, applying shear force in the disperser to form a dispersion having droplets of a desired size, subsequently introducing the dispersion into a polymerization vessel, and completing a polymerizating reaction to produce a polymer or a polymer composition.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: October 31, 2000
    Assignee: Tomoegawa Paper Co.
    Inventors: Masafumi Kamiyama, Haruhiko Yano, Minoru Tsuchida, Eiji O'shima
  • Patent number: 6139940
    Abstract: It is an object of the present invention to provide an inkjet recording sheet which can solve the problems of conventional inkjet printing sheets which has good ink absorbing properties, storage properties causing no blocking, clearness of printed images, and excellent fixing properties; and which can provide highly fine images without blurring in full color printing; therefore, in order to accomplish the objects, the of the present invention comprises an ink absorbing layer on at least one surface of a substrate, and an ink impermeable layer comprising a hydrophobic resin on the surface of the ink absorbing layer.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: October 31, 2000
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Kiyoshi Iwamoto, Senichi Yoshizawa
  • Patent number: 6132865
    Abstract: An adhesive tape for electronic parts which comprises a metal substrate and an adhesive layer A and an adhesive layer B laminated in order on at least one side of said metal substrate, wherein said adhesive A comprises a polyimide consisting of 100 -20% by mol of the repeating unit represented by the following formula (1a) and 0-80% by mol of the repeating unit represented by the following formula (1b), said adhesive B comprises a polyimide consisting of 100-40% by mol of the repeating unit represented by the following formula (1a) and 0-60% by mol of the repeating unit represented by the following formula (2), and the adhesive layer A and the adhesive layer B have each a different glass transition temperature: ##STR1## wherein Ar represents a divalent group selected from the specified structures containing aromatic rings, R is an alkylene group having 1 to 10 carbon atoms or --CH.sub.2 OC.sub.6 H.sub.4 --, the methylene group of which attaches to Si, and n means an integer of 1 to 20.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: October 17, 2000
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Osamu Oka, Jun Tochihira, Fumiki Komagata
  • Patent number: 6113979
    Abstract: The powder coating of the present invention was used for a method for forming coatings comprising the steps of making the powder coating adhere to an adhesive layer previously formed on the surface of a material to be coated, and then heating it, thereby forming a coating, comprising a resin particle containing a thermosetting resin, and a particle containing a curing agent.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: September 5, 2000
    Assignees: Intermetallics Co., Ltd., Tomoegawa Paper Co., Ltd.
    Inventors: Masato Sagawa, Osamu Itatani, Akira Fujiwara
  • Patent number: 6091874
    Abstract: A flexible polymer optical waveguide device which is excellent in mechanical strength and durability against environments, particularly excellent in heat and chemical resistance, with maintaining characteristics of an optical waveguide and which can be easily produced, and a process for the production thereof, the flexible optical waveguide device having a structure in which a cured resin layer is formed on at least one surface of an optical waveguide film obtained by forming a refractive index distribution in a light-permeable polymer film, the cured resin layer(s) comprising a polyamide resin and at least one of an epoxy resin and a phenolic resin as main components.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: July 18, 2000
    Assignees: Tomoegawa Paper Co., Ltd., Mitsubishi Gas Chemical Company, Inc.
    Inventors: Kensaku Higashi, Michio Ohba, Yasunari Kawabata, Kuniaki Jinnai