Patents by Inventor Kunioki Kato

Kunioki Kato 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: 5175372
    Abstract: In a process of producing high purity bis(4-hydroxyphenyl)sulfides which comprises reacting phenols with sulfur dichloride in an organic solvent, the improvement comprising: reacting the phenols with sulfur dichloride in a nonpolar organic solvent; removing partly or wholly the nonpolar organic solvent after the reaction; adding a polar organic solvent to the reaction mixture to dissolve the reaction mixture therein at elevated temperatures; and crystallizing out the high purity bis(4-hydroxyphenyl)sulfides.There is further provided a high performance heat-sensitive recording material which comprises high purity bis(4-hydroxy-3-methylphenyl)sulfide thus prepared and having a melting point in the range of from 123.9.degree. C. to 124.9.degree. C. as a developer and a fluoran compound as a color former.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: December 29, 1992
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Akira Onoe, Masao Kawamura, Kunioki Kato, Tomiharu Amitani, Makoto Sato, Tsuyoshi Morishita
  • Patent number: 5102858
    Abstract: In a process of producing high purity bis(4-hydroxyphenyl) sulfides which comprises reacting phenols with sulfur dichloride in organic solvents, the improvement comprising: reacting the phenols with sulfur dichloride in nonpolar organic solvents; removing partly or wholly the nonpolar organic solvents after the reaction; adding polar organic solvents to the reaction mixture to dissolve the reaction mixture therein at elevated temperatures; and crystallizing out the high purity bis(4-hydroxyphenyl)sulfides.There is further provided a high performance heat-sensitive recording material which comprises high purity bis(4-hydroxy-3-methylphenyl)sulfide thus prepared and having a melting point in the range of from 123.9.degree. C. to 124.9.degree. C. as a developer and a fluoran compound as a color former.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: April 7, 1992
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Akira Onoe, Masao Kawamura, Kunioki Kato, Tomiharu Amitani, Makoto Sato, Tsuyoshi Morishita
  • Patent number: 5101049
    Abstract: Novel compounds, 2-(.alpha.-alkoxyimino)ethylthiophenes are susceptible to electrophilic substitution reactions, and the acetylation, nitration, sulfonation and halogenation of the compounds provide 5-acetyl-2-(.alpha.-alkoxyimino)ethylthiophenes, 5-nitro-2-(.alpha.-alkoxyimino)ethylthiophenes, 5-(.alpha.-alkoxyimino)ethyl-2-thiophenesulfonic acid and 5-halo-2-(.alpha.-alkoxyimino)ethylthiophenes, respectively.The hydrolysis of 5-acetyl-2-(.alpha.-alkoxyimino)ethylthiophenes readily provides a known compound, 2,5-diacetylthiophene which is an important intermediate for the production of medicines, whereas the haloform reaction provides novel compounds, 5-(.alpha.-alkoxyimino)ethyl-2-thiophenecarboxylic acids, the hydrolysis of which compounds readily provides a known compound, 5-acetyl-2-thiophenecarboxylic acids, an important intermediate for the production of medicines.The hydrolysis of 5-(.alpha.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: March 31, 1992
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Hiroshi Goda, Masao Kawamura, Kunioki Kato, Makoto Sato
  • Patent number: 4943655
    Abstract: Process for preparing 2-alkyl-5-haloacetylbenzenesulfonamide represented by the general formula (1), ##STR1## (wherein R.sup.1 is an alkyl group having 1 to 5 carbon atoms; and X is a chlorine atom, bromine atom or iodine atom), characterized by halogenating a 5-acetyl-2-alkylbenzenesulfonamide represented by the general formula (2), ##STR2## (wherein R.sup.1 is the same as defined above) in a lower alcohol represented by the general formula (3),R.sup.4 --OH(wherein R.sup.4 is an alkyl group having 1 to 5 carbon atoms).
    Type: Grant
    Filed: March 24, 1989
    Date of Patent: July 24, 1990
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Kunioki Kato, Masao Kawamura, Hiroshi Goda, Kiyoshi Sawada, Kazuhiro Hamatani
  • Patent number: 4853158
    Abstract: Process for preparing 2-alkyl-5-haloacetylbenzenesulfonamide represented by the general formula (1), ##STR1## (wherein R.sup.1 is an alkyl group having 1 to 5 carbon atoms; and X is a chlorine atom, bromine atom or iodine atom), characterized by halogenating a 5-acetyl-2-alkylbenzenesulfonamide represented by the general formula (2), ##STR2## (wherein R.sup.1 is the same as defined above) in a lower alcohol represented by the general formula (3),R.sup.4 --OH(wherein R.sup.4 is an alkyl group having 1 to 5 carbon atoms).
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: August 1, 1989
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Kunioki Kato, Masao Kawamura, Hiroshi Goda, Kiyoshi Sawada, Kazuhiro Hamatani
  • Patent number: 4849138
    Abstract: A method of producing alkali metal benzenesulfinates having the general formula of ##STR1## wherein M represents Na or K, which comprises: reacting nitrophenylphenyl sulfones having the general formula of ##STR2## wherein n is an integer of 1 or 2, with alkali metal thiophenolates having the general formula of ##STR3## in solvents. The reaction produces also nitrophenylphenyl sulfides as by-products in equimolar amounts to the alkali metal benzenesulfinates, and the oxidation of the sulfides provides the starting nitrophenylphenyl sulfones.A method of producing the nitrophenylphenyl sulfones is also provided wherein the sulfides are oxidized with hydrogen peroxide in the presence both of water-soluble tungstates or molybdates and of phase transfer catalysts in a two-phase heterogeneous solvent.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: July 18, 1989
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Akira Onoe, Masao Kawamura, Kunioki Kato, Masato Yoshikawa, Hirokazu Kagano
  • Patent number: 4835317
    Abstract: Novel compounds, 4-tert.-butyl-1,2-benzenedithiol and bis(4-tert.-butyl-1,2-dithiophenolate) metal complexes having the general formula of ##STR1## wherein M represents a trivalent transition metal, and A represents a quarternary ammonium are provided.The novel benzenedithiol is produced by reacting 4-tert.-butylbenzenethiol or di(4-tert.-butylphenyl)disulfide with sulfur monochloride in the presence of iodine or a Lewis acid in a solvent, and then reducing the resultant product with a metal selected from the group consisting of zinc, tin, iron and aluminum in the presence of an acid.The novel Cu, Co and Ni complexes are produced by reacting the benzenedithiol with a salt of the corresponding divalent transition metal in the presence of an alkoxide metal or a hydride metal and a quarternary ammonium salt in a solvent under an oxidative atmosphere.
    Type: Grant
    Filed: January 13, 1988
    Date of Patent: May 30, 1989
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Michio Suzuki, Masao Kawamura, Kunioki Kato, Masahide Takahashi, Tsuyoshi Morishita, Kazuyuki Nakayama, Akio Nakatsuka
  • Patent number: 4792612
    Abstract: Novel compounds, 2-(.alpha.-alkoxyimino)ethylthiophenes are susceptible to electrophilic substitution reactions, and the acetylation, nitration, sulfonation and halogenation of the compounds provide 5-acetyl-2-(.alpha.-alkoxyimino)ethylthiophenes, 5-nitro-2-(.alpha.-alkoxyimino)ethylthiophenes, 5-(.alpha.-alkoxyimino)ethyl-2-thiophenesulfonic acid and 5-halo-2-(.alpha.-alkoxyimino)ethylthiophenes, respectively.The hydrolysis of 5-acetyl-2-(.alpha.-alkoxyimino)ethylthiophenes readily provides a known compound, 2,5-diacetylthiophene which is an important intermediate for the production of medicines, whereas the haloform reaction provides novel compounds, 5-(.alpha.-alkoxyimino)ethyl-2-thiophenecarboxylic acids, the hydrolysis of which compounds readily provides a known compound, 5-acetyl-2-thiophenecarboxylic acids, an important intermediate for the production of medicines.The hydrolysis of 5-(.alpha.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: December 20, 1988
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Hiroshi Goda, Masao Kawamura, Kunioki Kato, Makoto Sato
  • Patent number: 4273941
    Abstract: A process for producing p-hydroxybenzaldehyde through p-aminobenzaldehyde from p-nitrotoluene, comprising reacting p-nitrotoluene with sodium polysulphide in an alcohol-alkali aqueous solution mixed solvent in the presence or absence of an aprotic polar compound to produce p-aminobenzaldehyde, diazotizing the p-aminobenzaldehyde and then hydrolyzing the diazotized p-aminobenzaldehyde to produce p-hydroxybenzaldehyde.
    Type: Grant
    Filed: July 6, 1979
    Date of Patent: June 16, 1981
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Masao Kawamura, Tadaaki Nishi, Kunioki Kato, Hiroshi Mizokami, Tadashi Kanazawa
  • Patent number: 4195041
    Abstract: A process for producing p-hydroxybenzaldehyde through p-aminobenzaldehyde from p-nitrotoluene, comprising reacting p-nitrotoluene with sodium polysulphide in an alcohol-alkali aqueous solution mixed solvent in the presence or absence of an aprotic polar compound to produce p-aminobenzaldehyde, diazotizing the p-aminobenzaldehyde and then hydrolyzing the diazotized p-aminobenzaldehyde to produce p-hydroxybenzaldehyde.
    Type: Grant
    Filed: August 30, 1978
    Date of Patent: March 25, 1980
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Masao Kawamura, Tadaaki Nishi, Kunioki Kato, Hiroshi Mizokami, Tadashi Kanazawa
  • Patent number: 4172912
    Abstract: A coating composite containing sulfochlorinated polyolefin having a sulfur content ranging from 0.2 to 2.5% by weight and a chlorine content ranging from 18 to 37% by weight is applied directly as an adhesive layer or is applied on one surface of a thermoplastic resin base to be contacted with a metal surface, which resin base is coated on the metal surface.When the coating composite is pressed thereafter under a pressure, a coating on the metal surface with excellent adhesion, water and impact resistances is provided.
    Type: Grant
    Filed: October 20, 1977
    Date of Patent: October 30, 1979
    Assignees: Sumitomo Metal Industries Limited, Seitetsu Kagaku Co., Ltd.
    Inventors: Kohji Noji, Tetsuzo Arai, Yasuhiko Okamoto, Kunioki Kato, Miyoshi Koyama, Koichi Fujiki