Patents by Inventor Yasutomo Mori
Yasutomo Mori 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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Patent number: 6846619Abstract: There is provided a leuco dye dispersion liquid for a thermosensitive recording material wherein the leuco dye is being dispersed with an anionic surfactant and an nonionic surfactant, while average particle diameter of the leuco dye ranges from 0.10 ?m to 0.30 ?m and content of particles less than or equal to 0.07 ?m in diameter of the dye is not greater than 1.0%. The leuco dye dispersion liquid shows no fogging, and can cause a high optical density of image on thermosensitive member with excellent brightness in background area, and a high durability for storage at elevated temperature.Type: GrantFiled: March 22, 2002Date of Patent: January 25, 2005Assignee: Ricoh Company, Ltd.Inventors: Yoshikazu Kaneko, Yasutomo Mori, Kunio Hayakawa, Mitsunobu Morita, Takeshi Kajikawa, Shuuji Miyamoto, Yuuichi Kawaguchi
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Patent number: 6710015Abstract: A thermosensitive recording material having a support, a thermosensitive recording layer containing a leuco dye and a color developer, and an intermediate layer interposed therebetween. The intermediate layer contains hollow particles having a hollowness of 60 to 98%, a maximum particle diameter (D100) of 5.0 to 10.0 &mgr;m and a ratio D100/D50 of the maximum particle diameter (D100) to the median volume equivalent particle diameter (D50) in the range of 1.5 to 3.0. The hollow particles may be composed of a crosslinked polymer of a chlorine-free vinyl monomer.Type: GrantFiled: June 25, 2002Date of Patent: March 23, 2004Assignee: Ricoh Company, Ltd.Inventors: Yoshikazu Kaneko, Yasutomo Mori, Mitsuru Naruse, Kunio Hayakawa, Mitsunobu Morita
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Publication number: 20030125205Abstract: A thermosensitive recording material having a support, a thermosensitive recording layer containing a leuco dye and a color developer, and an intermediate layer interposed therebetween. The intermediate layer contains hollow particles having a hollowness of 60 to 98%, a maximum particle diameter (D100) of 5.0 to 10.0 &mgr;m and a ratio D100/D50 of the maximum particle diameter (D100) to the median volume equivalent particle diameter (050) in the range of 1.5 to 3.0. The hollow particles may be composed of a crosslinked polymer of a chlorine-free vinyl monomer.Type: ApplicationFiled: June 25, 2002Publication date: July 3, 2003Inventors: Yoshikazu Kaneko, Yasutomo Mori, Mitsuru Naruse, Kunio Hayakawa, Mitsunobu Morita
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Publication number: 20030060366Abstract: There is provided a leuco dye dispersion liquid for a thermosensitive recording material wherein the leuco dye is being dispersed with an anionic surfactant and an nonionic surfactant, while average particle diameter of the leuco dye ranges from 0.10 &mgr;m to 0.30 &mgr;m and content of particles less than or equal to 0.07 &mgr;m in diameter of the dye is not greater than 1.0%. The leuco dye dispersion liquid shows no fogging, and can cause a high optical density of image on thermosensitive member with excellent brightness in background area, and a high durability for storage at elevated temperature.Type: ApplicationFiled: March 22, 2002Publication date: March 27, 2003Applicant: Ricoh Company, Ltd.Inventors: Yoshikazu Kaneko, Yasutomo Mori, Kunio Hayakawa, Mitsunobu Morita, Takeshi Kajikawa, Shuuji Miyamoto, Yuuichi kawaguchi
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Patent number: 6060427Abstract: A thermosensitive recording material including a substrate, a thermosensitive coloring layer which is formed overlying the substrate and which induces color formation upon application of heat, and a protective layer which is formed overlying the thermosensitive coloring layer and which includes a resin, wherein the protective layer is formed by coating with a liquid including a core-shell type emulsion of the resin, and wherein the core-shell type emulsion of the resin is prepared by polymerizing monomers including (d) acrylamide and/or methacrylamide and (e) a vinyl monomer having a hydroxy group in the presence of a seed emulsion which is prepared by polymerizing monomers including (a) acrylamide and/or methacrylamide, (b) acrylonitrile and (c) a vinyl monomer having a hydroxy group.Type: GrantFiled: August 14, 1998Date of Patent: May 9, 2000Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Mitsuru Naruse, Takeshi Akimoto
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Patent number: 5972836Abstract: A thermosensitive recording medium having a support, a thermosensitive layer provided on the support, and a protecting layer provided on the thermosensitive layer and containing montan wax particles having an average particle diameter AD of not greater than 1.5 .mu.m and such a particle size distribution that at least 99% of the montan wax particles have a particle diameter of not greater than (AD+0.5 .mu.m). The protecting layer is obtained by drying a layer of an aqueous dispersion containing an aqueous emulsion of the montan wax particles.Type: GrantFiled: July 18, 1997Date of Patent: October 26, 1999Assignee: Ricoh Company, Ltd.Inventors: Mitsunobu Morita, Yasutomo Mori, Takeshi Kajikawa
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Patent number: 5919729Abstract: A thermosensitive recording medium having a support, a thermosensitive layer provided on the support and capable of forming a color image when heated imagewise, and a protecting layer provided on the thermosensitive layer and containing a pigment and a core-shell resin obtained by polymerizing a vinyl monomer in an emulsion containing acrylonitrile-containing polymer seeds such that a polymer of the vinyl monomer is copolymerized on each of the seeds to form a shell surrounding a core of the seed, wherein the core-shell resin meets with at least one of the following criteria (a) and (b):(a) the glass transition point Tg of the core is at least 15.degree. C.; and(b) the glass transition point Tg of the shell is at least 150.degree. C. The vinyl monomer contains acrylamide and/or methacrylamide.Type: GrantFiled: December 16, 1996Date of Patent: July 6, 1999Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Takeshi Kajikawa, Mitsunobu Morita, Mitsuru Naruse
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Patent number: 5721190Abstract: A thermosensitive recording medium including a support, and at least one layer provided on the support, wherein one of the at least one layer is a thermosensitive layer capable of forming a color image when heated imagewise, and one of the at least one layer contains a zinc dithiocarbamate of the formula: ##STR1## wherein R.sup.1 and R.sup.2 stand independently from each other for an alkyl group having 1-4 carbon atoms or a phenyl group. The zinc dithiocarbamate is contained in the thermosensitive layer or an intermediate layer interposed between the thermosensitive layer and the support.Type: GrantFiled: July 2, 1996Date of Patent: February 24, 1998Assignee: Ricoh Company, Ltd.Inventors: Shuji Miyamoto, Yasutomo Mori, Takeshi Akimoto
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Patent number: 5703006Abstract: A thermosensitive recording medium is disclosed which includes a support, and a thermosensitive color-developing layer formed on the support and containing a leuco dye having a melting point of at least 200.degree. C. and a color developer having a melting point of at least 180.degree..Type: GrantFiled: January 11, 1996Date of Patent: December 30, 1997Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Motoi Orihara, Kunihiko Hada, Shuji Miyamoto
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Patent number: 5646088Abstract: A thermosensitive recording material having a high degree of background whiteness, superior light resistance without coloring of the background when exposed to the light, and a method of producing a stable coating liquid or forming a thermosensitive coloring layer and a protective layer are provided.Type: GrantFiled: February 15, 1996Date of Patent: July 8, 1997Assignee: Ricoh Co., Ltd.Inventors: Kunihiko Hada, Yasutomo Mori, Motoi Orihara, Shuji Miyamoto
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Patent number: 5622909Abstract: A thermosensitive recording material of this invention has a support, on which a thermosensitive color developing layer mainly composed of a leuco dye and a color developer which is contacted with the leuco dye while heating to develop a color and a protective layer mainly composed of polyvinyl alcohol together with either aziridine compound or dimethylolurea are successively provided, the color developer being at least one of phthalic acid derivatives represented by the following general formula (I): ##STR1## wherein R.sub.1, X, Y and 1 are as defined in above. The thermosensitive recording material of this invention is excellent in sensitivity and density of the color development and has the high storage stability of the recorded images. Accordingly, the thermosensitive recording material of this invention is very useful.The selected inorganic filler may be incorporated in the thermosensitive color developing layer and/or the protective layer.Type: GrantFiled: May 15, 1995Date of Patent: April 22, 1997Assignee: Ricoh Company, Ltd.Inventors: Hiromi Furuya, Yasutomo Mori, Keishi Taniguchi, Takeshi Yuyama
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Patent number: 5409881Abstract: A thermosensitive recording material composed of a support, a thermosensitive recording layer formed on the support, capable of producing colored images by heating, and a protective layer formed on the thermosensitive recording layer, which contains as a resin component a copolymer resin obtained by copolymerization of arylamide or methacrylamide, acrylonitrile, and a vinyl monomer having a carboxyl group, or a copolymer resin of a core-shell emulsion type obtained by copolymerization of acrylamide and/or methacrylamide in the presence of a seed emulsion of an acryl-based copolymer or methacryl-based copolymer, and as a crosslinking agent a compound having two or more alkyleneimino groups, a carbodiimide compound, a methyl ethyl ketoxime compound, or bis(.beta.-hydroxyethyl)sulfone.Type: GrantFiled: December 23, 1992Date of Patent: April 25, 1995Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Mitsuru Naruse, Kunihiko Hada, Motoo Tasaka
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Patent number: 5043313Abstract: A thermosensitive recording material comprising (a) a support, and (b) a thermosensitive recording layer formed on the support, comprising a leuco dye and a color developing agent comprising a metal salt or metal complex of a compound having formula (I), which is capable of inducing color formation in the leuco dye upon application of heat thereto: ##STR1## wherein X represents a halogen, an alkyl group having 1 to 10 carbon atoms, or an alkoxyl group having 1 to 10 carbon atoms; R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represent hydrogen, a halogen, a hydroxyl group, an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an aralkyloxyl group having 7 to 20 carbon atoms, an aryloxyl group having 6 to 20 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, an aralkylthio group having 6 to 20 carbon atoms or an arylthio group having 6 to 20 carbon atoms, R.sup.1 and R.sup.2, or R.sup.2 and R.sup.Type: GrantFiled: March 23, 1990Date of Patent: August 27, 1991Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Norio Kurisu, Toshinobu Iwata, Mikio Goto
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Patent number: 4985394Abstract: A thermosensitive recording material is disclosed, which comprises a substrate, a thermosensitive coloring layer comprising a leuco dye and a color developer capable of inducing color formation in the leuco dye, formed on the substrate, and a protective layer comprising at least one inorganic pigment selected from the group consisting of silica and calcium carbonate, each having an average particle diameter of 0.1 .mu.m or less, and a water-soluble binder, formed on the thermosensitive coloring layer.Type: GrantFiled: December 13, 1989Date of Patent: January 15, 1991Assignee: Ricoh Company, Ltd.Inventors: Yasutomo Mori, Norio Kurisu
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Patent number: 4912079Abstract: A thermosensitive recording material is disclosed, which comprises a support, an intermediate layer having a voidage ranging from 50% to 95% and a thickness of 3 .mu.m to 100 .mu.m, and a thermosensitive coloring layer, which layers are successively formed on the intermediate layer.Type: GrantFiled: May 27, 1988Date of Patent: March 27, 1990Assignee: Ricoh Company, Ltd.Inventors: Kanjirou Kawasaki, Hiroaki Inoue, Tomohisa Kakuda, Yasutomo Mori