Patents by Inventor Hirokazu Tsukahara
Hirokazu Tsukahara 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: 5252393Abstract: The present invention is concerned with a thermal delayed tack composition which is non-adhesive at ordinary temperatures but can be activated and tackified when heated and can maintain its tackiness for a long period of time even after separated from a heat source, and thermal delayed tack sheets prepared by coating basic sheets with this thermal delayed tack composition and then drying the same. The thermal delayed tack sheets have the features that even when they are wound into a roll or superimposed upon each other, no blocking or sticking occurs, and that the tackiness thereof can be maintained for a long period of time even upon a plastic material such as for example polyethylene having low polarity.Type: GrantFiled: May 5, 1992Date of Patent: October 12, 1993Assignee: Mitsubishi Paper Mills Ltd.Inventors: Nobuhiro Kagota, Hirokazu Tsukahara
-
Patent number: 5112797Abstract: A donor sheet for pressure-sensitive image recording which comprises a support, an undercoating layer applied onto said support, and an overcoating layer applied onto said undercoating layer, said undercoating layer comprising microcapsules containing a solid wax, and said overcoating layer comprising microcapsules containing an image-forming component. By using said donor sheet, record images having a sufficiently high color density and a high resolution degree can be formed on a receptor sheet.Type: GrantFiled: September 28, 1990Date of Patent: May 12, 1992Assignee: Mitsubishi Paper Mills LimitedInventors: Shunsuke Takahashi, Hirokazu Tsukahara
-
Patent number: 4833023Abstract: Thermal delayed tack sheets prepared by coating base sheets with a thermal delayed tack composition basically containing an adhesive polymer (A) and a solid plasticizer (B), and preferably further containing a tackifier (C), the thermal delayed tack sheets being characterized in that the solid plasticizer comprises fine particles of one or more selected from the compounds represented by the following general formula (I):R.sub.1 --O--.PHI.--R.sub.2 general formula (I)wherein .PHI. is a benzene ring or a naphthalene ring which may have a substituent, R.sub.1 is a hydrogen atom, an acyl radical, an alkylsulfonyl radical or a benzenesulfonyl radical which may have a substituent on the benzene ring thereof, R.sub.2 is a radical of --O--CO--R.sub.3 or --CO--CO--R.sub.3, and R.sub.3 is a radical selected from the group consisting of an alkyl radical, an alkenyl radical, an aralkyl radical, an aralkenyl radical and an aryl radical, and when R.sub.Type: GrantFiled: March 28, 1988Date of Patent: May 23, 1989Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Nobuhiro Kagota, Masashi Yoda
-
Patent number: 4775417Abstract: A compound of the formula: ##STR1## wherein R is a hydrocarbon group, is effective as a color developer in recording materials and particularly excellent in the image stability.Type: GrantFiled: July 21, 1987Date of Patent: October 4, 1988Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Shigetoshi Hiraishi
-
Patent number: 4745026Abstract: Thermal delayed tack sheet prepared by coating a base sheet with a thermal delayed tack composition containing an adhesive polymer, a solid plasticizer, and preferably a tackifier, which plasticizers are fine particle solid compound(s) at room temperature.Type: GrantFiled: March 3, 1987Date of Patent: May 17, 1988Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Nobuhiro Kagota, Masashi Yoda
-
Patent number: 4737587Abstract: Disclosed is a colorless dye for use in recording materials comprising a compound represented by the general formula: ##STR1## Said recording materials are of the types which utilize a color developing reaction between an electron-donating colorless dye and an electron-accepting color developer, such as, carbonless pressure-sensitive recording materials, thermosensitive recording materials, etc.Type: GrantFiled: November 20, 1986Date of Patent: April 12, 1988Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Fumio Okumura, Hirokazu Tsukahara, Haruhiko Ikeda
-
Patent number: 4711749Abstract: A stable emulsion of microcapsules is obtained by polymerizing at least one water-soluble vinyl monomer in an aqueous solution of an oil-soluble vinyl monomer-maleic anhydride-maleic ester multipolymer to prepare a water-soluble resin, dispersing or emulsifying discrete fine particles of a hydrophobic material in an acidic aqueous solution of the water-soluble resin, adding an amino resin precursor separately prepared to the dispersion or emulsion, and heating the mixture.Type: GrantFiled: November 7, 1985Date of Patent: December 8, 1987Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Takao Kosaka, Fumio Okumura, Hirokazu Tsukahara
-
Patent number: 4550328Abstract: Disclosed is an image-receiving color-forming sheet for transfer-type electrophotography which comprises a support, a color forming layer containing an electron accepting material provided thereon and a high resistivity layer, wherein a self-emulsifiable resin mainly composed of acrylate ester and/or methacrylate ester is used as a dielectric substance contained in said high resistivity layer.Type: GrantFiled: August 11, 1983Date of Patent: October 29, 1985Assignee: Mitsubishi Paper Mills, LimitedInventors: Takao Kosaka, Hirokazu Tsukahara
-
Patent number: 4327148Abstract: A self-contained color forming pressure sensitive record paper of the single coating type which has on one side of a support a coating layer of a mixture of color former-containing microcapsules and color developer-containing microcapsules, as well as a powdered polyolefin. The powdered polyolefin acts as capsule protecting agent and prevents the smudging due to unintentional color development caused by the rapture of the capsules.Type: GrantFiled: November 28, 1979Date of Patent: April 27, 1982Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Kohji Toyama, Mitsuru Fuchigami, Isao Nagayasu, Hirokazu Tsukahara
-
Patent number: 4296948Abstract: A color-developing sheet for use in no-carbon copying system, which contains a layer of a combination of a solid acid with an acidic polymer is improved in preventing yellowing during the preservation thereof, in giving high color intensity and stability to image formed, by incorporating titanium dioxide into the layer.Type: GrantFiled: November 28, 1979Date of Patent: October 27, 1981Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Tsutomu Satoh, Hideo Ohye, Hirokazu Tsukahara, Hideaki Senoh, Takahiro Torii
-
Patent number: 4291102Abstract: There is provided a desensitizer used in a quick-drying desensitizing ink for no-carbon copy paper, which is a compound represented by the formula ##STR1## wherein R.sup.1 represents hydrogen atom or methyl group; R.sup.2 represents hydrogen atom, a methyl group, a phenyl group which may have as substituent an alkyl group having 1 to 12 carbon atoms, CH.sub.2 .dbd.CHCO--, ##STR2## R.sup.3 represents CH.sub.2 .dbd.CHCO--, ##STR3## and l and m are integers of 1 or greater than 1, l+m being not greater than 46, and p is zero or an integer of 1, provided that when p is 1 zero R.sup.Type: GrantFiled: December 13, 1979Date of Patent: September 22, 1981Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Mitsuru Fuchigami, Nobuhiro Kagota
-
Patent number: 4268634Abstract: There is provided a desensitizer used in a quick-drying desensitizing ink for no-carbon copy paper, which is a compound represented by the formula ##STR1## wherein R.sup.1 represents hydrogen atom or methyl group; R.sup.2 represents hydrogen atom, a methyl group, a phenyl group which may have as substituent an alkyl group having 1 to 12 carbon atoms, ##STR2## and l and m are integers of 1 or greater than 1, l+m being not greater than 46, and p is zero or an integer of 1, provided that when p is zero R.sup.Type: GrantFiled: December 23, 1977Date of Patent: May 19, 1981Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Mitsuru Fuchigami, Nobuhiro Kagota
-
Patent number: 3963779Abstract: A novel organic photoconductive compound having the general formula, ##SPC1##Wherein R.sub.1 is an alkyl group having 1-11 carbon atoms, R.sub.2 is hydrogen, methyl, nitro or a halogen and n and m are integers of 1 or 2 and may be the same or different, can provide extremely highly sensitive and inexpensive elecrophotographic material.Type: GrantFiled: September 5, 1972Date of Patent: June 15, 1976Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hirokazu Tsukahara, Kazuhiro Emoto
-
Patent number: 3932182Abstract: An organic photoconductive composition, useful as an electrophotosensitizing material consisting of an organic photoconductive compound and a compound having an active methylene, as chemical sensitizer, represented by the formula,R--COCH.sub.2 --Xor ##EQU1## wherein R is a substituted or unsubstituted phenyl, alkyl, arylamino, alkylamino, aryloxy or alkoxy; X is acyl, carbamoyl, phenyl-substituted carbamoyl or cyano; Y is carbonyl, oxygen, sulfur, ##EQU2## (wherein L is hydrogen or alkyl); Z is a residue necessary to form a 5- or 6-membered ring, and method for making the same.Type: GrantFiled: January 17, 1974Date of Patent: January 13, 1976Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Kiyoshi Futaki, Hirokazu Tsukahara, Kazuhiro Emoto