Patents Assigned to Tomoegawa Paper Co., Ltd.
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Publication number: 20020172810Abstract: The invention provides an optical sheet having and sufficiently exhibiting high light transparency and uniform light diffusivity. The optical sheet comprises transparent resin layers 2 and 3 and a fine particle layer 5 consisting of transparent fine particles 4 which are arranged as a monoparticle layer between the transparent resin layers 2 and 3 in an embedded state, wherein the refractive indexes of said transparent resin layers are different from that of said transparent fine particle. The optical sheet is produced by a process which comprises at least a step of forming a transparent resin layer having at least temporary stickiness on a substrate, a step of forming a fine particle layer by covering said transparent resin layer with transparent fine particles so as to form a monoparticle layer and fixing them, and a step of laminating a transparent resin layer on said fine particle layer.Type: ApplicationFiled: April 4, 2002Publication date: November 21, 2002Applicant: Tomoegawa Paper Co., Ltd.Inventors: Makoto Murata, Kensaku Higashi
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Patent number: 6455169Abstract: An inkjet recording sheet whose discoloration, which is caused with the passage of time, is prevented, the inkjet recording sheet comprising a substrate and an ink receptor layer formed on the substrate, the ink receptor layer containing a polymer obtained from a monomer component containing at least vinyl-polymerizable monomer containing a basic nitrogen atom, the ink receptor layer containing a polymerization inhibitor in an amount of 10 to 500 ppm.Type: GrantFiled: October 18, 1999Date of Patent: September 24, 2002Assignees: Tomoegawa Paper Co., Ltd., Seiko Epson CorporationInventors: Kiyoshi Iwamoto, Senichi Yoshizawa, Hiroyuki Onishi, Masaaki Itano, Akio Owatari
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Light reflecting plate, production process thereof and reflection type liquid crystal display device
Publication number: 20020113925Abstract: The invention relates to a reflecting plate for a reflection type liquid crystal display device capable of reproducing paper whiteness, a production process thereof, and a reflection type liquid crystal display device making use of the reflecting plate. The light reflecting plate comprises a substrate, a single-layer powder coating provided on the substrate by laying powder particles in a state of a monoparticle layer on the substrate to fix them, and a thin metal film laminated on the single-layer powder coating. It is produced by successively performing the steps of providing a binder layer having tackiness on a substrate, laying powder particles in a state of a monoparticle layer on the binder layer having tackiness to fix them, and laminating a thin metal film on the single-layer powder coating formed in the late step.Type: ApplicationFiled: December 17, 2001Publication date: August 22, 2002Applicant: Tomoegawa Paper Co., Ltd.Inventor: Kensaku Higashi -
Patent number: 6432600Abstract: Toner used for electrophotography includes a polylactic acid type biodegradable resin and a terpene-phenol copolymer. The molar concentration of one of the L-lactic acid units and D-lactic acid units in a lactic acid component of the polylactic acid type biodegradable resin is in the range between about 75 mol % and about 98 mol %.Type: GrantFiled: December 7, 2000Date of Patent: August 13, 2002Assignees: Tomoegawa Paper Co., Ltd., Shimadzu CorporationInventors: Yoshihito Suwa, Hisashi Okuyama, Yasumasa Horibe
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Patent number: 6426138Abstract: The present invention provides an adhesive film for electronic parts, for example, an adhesive agent in a tape BGA (Ball Grid Array) or &mgr;-BGA (trade name) package, in which embedding and adhesion to copper patterns on circuit boards are excellent, in which feeding and punching quality in the film state are superior, and which can reduce stress caused by thermal expansion difference between a circuit board and a reinforcing metal board or an IC chip. Adhesive film for electronic parts comprises a resin layer in which the dynamic modulus of elasticity at −30 to 125° C. is from 1 to 30 MPa and adhesive layers are coated on surfaces of the resin layer.Type: GrantFiled: August 13, 1999Date of Patent: July 30, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventors: Hitoshi Narushima, Toshihiro Nakajima
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Patent number: 6416232Abstract: An optical interconnection apparatus (8) comprises a two-dimensional flexible base film (1), a plurality of optical fibers (4) with end portion for optical connection (e.g., optical connectors), and a protective resin layer (2) of plastic material filled inside edge-dam (7) formed along or in the vicinity of the peripheral edges of the base film (1). The base film (1) has an opening, in which the protective resin layer (2) covers the optical fibers (4) to fix them. A plurality of such apparatus (8) can be stacked to form a laminate. Since the base film (1) has the opening where the optical fibers (4) are routed intricately, the optical interconnection apparatus (8) has improved flexibility and can be used in a narrow space.Type: GrantFiled: September 27, 2001Date of Patent: July 9, 2002Assignees: Tomoegawa Paper Co., Ltd., Nippon Telegraph and Telephone CorporationInventors: Kyoichi Sasaki, Ritsu Kawase, Ken Sukegawa, Tatsushi Kobayashi, Koichi Arishima, Mamoru Hirayama
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Patent number: 6395391Abstract: An adhesive tape for electronic parts which comprises a metal substrate and an adhesive layer A and an adhesive layer B and an adhesive layer C laminated in order 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: 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 —CH2OC6H4—, the methylene group of which attaches to Si, and n means an integer of 1 to 20.Type: GrantFiled: April 27, 2000Date of Patent: May 28, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventors: Osamu Oka, Jun Tochihira, Fumiki Komagata
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Patent number: 6391508Abstract: The present invention relates to a toner and a two-component developer which can produce high quality images with decreasing the dependence on environment and the back ground during continuous printing of a large number of sheets. The toner includes toner particles including a binder resin as a main component thereof and having particle surfaces deposited with titanium oxide particles, the surfaces of which are treated with at least isobutyl trimethoxy silane and trimethyl siloxysilicate. The two-component developer includes the toner and a carrier including core particles, the surfaces of which are coated with a resin coating agent including 5 to 20 percent by weight of carbon black, relative to the total weight of the resin coating agent.Type: GrantFiled: June 27, 2001Date of Patent: May 21, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventor: Kazuyoshi Hattori
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Patent number: 6383558Abstract: A coating method for uniformly forming a monolayer powder film on a base material, even if fine powders having a volume average particle diameter of 15 &mgr;m or less are employed is disclosed. An adhesive layer consisting of an adhesive having a weight average molecular weight of 250,000 or more is formed on a base material, powders are adhered on the adhesive layer, the powders are embedded in a surface of the adhesive layer by impacts of granular pressure media, adhered surplus powders are removed from this laminate, and a monolayer powder film consisting of a large amount of powders embedded as a monolayer, so that part thereof protrudes from the adhesive layer, is thereby formed on a surface of the adhesive layer.Type: GrantFiled: July 12, 2000Date of Patent: May 7, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventors: Akira Fujiwara, Shuji Mitani, Chikara Murata
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Patent number: 6350507Abstract: The present invention provides a superior recording sheet for ink jet printers which can completely satisfy property requirements such as light resistance of the printing images. The recording sheet for an ink jet printer includes a water-soluble divalent or greater metallic salt, so that properties such as light resistance are improved very effectively.Type: GrantFiled: March 16, 1999Date of Patent: February 26, 2002Assignees: Tomoegawa Paper Co., Ltd., Seiko Epson CorporationInventors: Kiyoshi Iwamoto, Shinitiro Kobayashi, Takeshi Yoshimoto, Takayuki Ishikawa, Nobuhiro Kubota, Jun Sugiyama, Hiroyuki Onishi, Yukari Sano
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Patent number: 6346598Abstract: A thermosetting low-dielectric resin composition which has a low dielectric constant and a low dielectric tangent for use in a printed circuit board and which has excellent adhesion to a metal and scatters almost no resin when used for forming a prepreg by punching or cutting, the composition comprising a component (a): siloxane-modified polyimide, component (b): a compound containing 2 methylallyl groups and having the following formula (1) or a compound containing 3 allyl groups or 3 methylallyl groups and having the following formula (1A), and component (c): a compound containing at least 2 maleimide groups, wherein R is a hydrogen atom or methyl group.Type: GrantFiled: November 3, 1999Date of Patent: February 12, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventors: Takeshi Hashimoto, Masaharu Kobayashi, Takeshi Sato, Daisuke Orino
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Electrically conductive adhesive composition, electrically conductive adhesive sheet and use thereof
Patent number: 6344155Abstract: An electrically conductive adhesive composition which has flexibility and folding endurance and is feasible for use as a shield against electromagnetic waves from a flexible printed circuit, comprises 100 parts by weight of (a) an acrylonitrile-butadiene copolymer, 20 to 500 parts by weight of (b) a phenolic resin and/or an epoxy resin, 1 to 100 parts by weight, per 100 parts by weight of the components (a) and (b) in total, of (c) an electrically conductive filler and 1 to 50 parts by weight, per 100 parts by weight of the components (a) and (b) in total, of (d) a bromine-containing flame retardant.Type: GrantFiled: April 3, 2000Date of Patent: February 5, 2002Assignee: Tomoegawa Paper Co., Ltd.Inventors: Hiroshi Kitahara, Kensaku Higashi -
Publication number: 20020004134Abstract: The present invention provide an adhesive sheet for electrostatic chucking device having high heat resistance and to an electrostatic chucking device which causes little curvature of the ceramic board after application of heat and is excellent in heat resistance and adsorptity. The adhesive sheet of the present invention comprises a silicone resin elastic layer 11 and thermosetting adhesive layers 12 and 13 which are each laminated on the silicone resin elastic layer, wherein said thermosetting adhesive layers are composed of epoxy resin or phenol resin. The electrostatic chucking device of the present invention is produced by laminating an electrode and a ceramic layer having an adsorptive surface on a metal base in this order via the adhesive sheet of the present invention.Type: ApplicationFiled: May 23, 2001Publication date: January 10, 2002Applicant: Tomoegawa Paper Co., Ltd.Inventors: Takeshi Shima, Tadao Matsunaga, Mitsuaki Horiike, Toshiyuki Yamamoto
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Patent number: 6329050Abstract: 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: GrantFiled: August 23, 2000Date of Patent: December 11, 2001Assignee: Tomoegawa Paper Co., Ltd.Inventors: Ken Yoshioka, Hitoshi Narushima, Osamu Oka
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Publication number: 20010033913Abstract: The invention provides an optical sheet suitable for use in displays such as LCD and EL and having good light transmission property and diffusiveness and moreover possessing excellent durability that the optical properties of the optical sheet can be retained even under high-temperature and high-humidity conditions. The optical sheet has a transparent substrate and a binder layer laminated directly or through another layer on the transparent substrate, wherein spherical fine particles having a particle diameter distribution of from 0.8 to 1.0 are embedded in a state of a monoparticle layer in the binder layer so as to partly project from the surface of the binder layer, and a distance from the top of the projected fine particles to the surface of the transparent substrate is from 100% to 110% of the volume average particle diameter of the spherical fine particles.Type: ApplicationFiled: March 20, 2001Publication date: October 25, 2001Applicant: TOMOEGAWA PAPER CO., LTDInventors: Makoto Murata, Kensaku Higashi
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Patent number: 6268033Abstract: A heat resisting adhesive composition for electronic parts and adhesive tapes of the present invention comprises a resin mixture of (A) 100 parts by weight of 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 (B) 5-150 parts by weight of a polyimide consisting of the repeating unit represented by the following formula (2a): wherein Ar represents a specified divalent group containing aromatic rings: wherein R is C1-C10 alkylene group or —CH2OC6H4—, the methylene group of which attaches to Si, and n is integer of 1-20.Type: GrantFiled: September 22, 1998Date of Patent: July 31, 2001Assignee: Tomoegawa Paper Co., Ltd.Inventors: Osamu Oka, Takeshi Sato
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Patent number: 6264357Abstract: 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: GrantFiled: December 27, 1993Date of Patent: July 24, 2001Assignee: Tomoegawa Paper Co., Ltd.Inventors: Masafumi Kamiyama, Haruhiko Yano, Minoru Tsuchida, Eiji O'Shima
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Patent number: 6265042Abstract: 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: GrantFiled: September 9, 1998Date of Patent: July 24, 2001Assignee: Tomoegawa Paper Co., Ltd.Inventors: Osamu Oka, Takeshi Nishigaya
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Patent number: 6261665Abstract: 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: GrantFiled: August 26, 1998Date of Patent: July 17, 2001Assignee: Tomoegawa Paper Co., Ltd.Inventors: Chikara Murata, Kazuya Ohishi, Yasuhiro Matsunaga, Kazuhiro Yamasaki, Yukinori Sakumoto
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Patent number: 6261684Abstract: 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: GrantFiled: December 17, 1998Date of Patent: July 17, 2001Assignee: Tomoegawa Paper Co., LTDInventors: Shinichi Takahashi, Kazunori Ikegaya