Patents Assigned to Hirofusa Shirai
  • Phthalaocyanine compound as a layer in optical recording medium
    Patent number: 5776576
    Abstract: A novel phthalocyanine compound having improved solubility and high purity and containing a polymerizable vinyl group within its molecule is provided. Intermediates to this phthalocyanine compound also have improved solubility and high purity. Further, with the novel phthalocyanine compound used as a starting monomer, a novel polymer is obtained which has a high content of (metal) phthalocyanine and is easy to control the orientation of phthalocyanine rings. The polymer having improved solubility and high purity is expected of use as functional material such as catalysts and recording material.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: July 7, 1998
    Assignees: Hirofusa Shirai, TDK Corporation
    Inventors: Mutsumi Kimura, Hirofusa Shirai, Toshiki Koyama, Kenji Hanabusa, Yuichi Kubota
  • Naphthalocyanine compounds, naphthalocyanine polymers and method for making
    Patent number: 5763601
    Abstract: Novel naphthalocyanine compounds are provided including nitro- and amino-substituted naphthalocyanine compounds, and vinyl-containing naphthalocyanine compounds. The compounds have improved solubility and high purity and are expected to find use as photo-functional materials such as dyes. Polymers are obtained using the vinyl-containing naphthalocyanine compounds. The polymers also have improved solubility, high purity, a high naphthalocyanine content and ease of control of the orientation of naphthalocyanine rings and are expected of use as various functional materials.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: June 9, 1998
    Assignees: Hirofusa Shirai, TDK Corporation
    Inventors: Hirofusa Shirai, Mutsumi Kimura, Yuichi Kubota
  • Naphthalocyanine compounds, naphthalocyanine polymers and method for making
    Patent number: 5633370
    Abstract: Novel naphthalocyanine compounds are provided including nitro- and amino-substituted naphthalocyanine compounds, and vinyl-containing naphthalocyanine compounds. The compounds have improved solubility and high purity and are expected to find use as photo-functional materials such as dyes. Polymers are obtained using the vinyl-containing naphthalocyanine compounds- The polymers also have improved solubility, high purity, a high naphthalocyanine content and ease of control of the orientation of naphthalocyanine rings and are expected of use as various functional materials.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: May 27, 1997
    Assignees: Hirofusa Shirai, TDK Corporation
    Inventors: Hirofusa Shirai, Mutsumi Kimura, Yuichi Kubota
  • Phthalocyanine compound and method for making, nitro-substituted phthalocyanine compound, amino-substituted phthalocyanine compound, phthalocyanine-containing polymer and method for making, catalyst, and optical recording medium
    Patent number: 5618930
    Abstract: A novel phthalocyanine compound having improved solubility and high purity and containing a polymerizable vinyl group within its molecule is provided. Intermediates to this phthalocyanine compound also have improved solubility and high purity. Further, with the novel phthalocyanine compound used as a starting monomer, a novel polymer is obtained which has a high content of (metal) phthalocyanine and is easy to control the orientation of phthalocyanine rings. The polymer having improved solubility and high purity is expected of use as functional material such as catalysts and recording material.
    Type: Grant
    Filed: March 1, 1996
    Date of Patent: April 8, 1997
    Assignees: Hirofusa Shirai, TDK Corporation
    Inventors: Mutsumi Kimura, Hirofusa Shirai, Toshiki Koyama, Kenji Hanabusa, Yuichi Kubota
  • Phthalocyanine compounds containing either a polymerizable vinyl group, a nitro group, or an amino group
    Patent number: 5516900
    Abstract: A novel phthalocyanine compound having improved solubility and high purity and containing a polymerizable vinyl group within its molecule is provided. Intermediates to this phthalocyanine compound also have improved solubility and high purity. Further, with the novel phthalocyanine compound used as a starting monomer, a novel polymer is obtained which has a high content of (metal) phthalocyanine and is easy to control the orientation of phthalocyanine rings. The polymer having improved solubility and high purity is expected of use as functional material such as catalysts and recording material.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: May 14, 1996
    Assignees: Hirofusa Shirai, TDK Corporation
    Inventors: Mutsumi Kimura, Hirofusa Shirai, Toshiki Koyama, Kenji Hanabusa, Yuichi Kubota
  • Polyurethane containing metal phthalocyanine in the main chain
    Patent number: 5053464
    Abstract: A polyurethane containing a metal phthalocyanine in the main chain is a novel compound and can be divided into two groups; one of which is a linear polymer and the other of which is a cross-linked polymer. This substance is useful as a redox catalyst due to the peculiar properties of the metal phthalocyanine. The polyurethane can be prepared by reacting a metal phthalocyanine polycarboxylic acid with thionyl chloride to obtain a metal phthalocyanine polycarboxylic acid polychloride; synthesizing a metal phthalocyanine polyhydroxy ester from the metal phthalocyanine polycarboxylic acid polychloride and a diol: HO--R.sup.1 --OH through a dehydrochlorination; and then addition-condensation-polymerizing the resulting metal phthalocyanine polyhydroxy ester, a diol: HO--R.sup.2 --OH and a diisocyanate.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: October 1, 1991
    Assignee: Hirofusa Shirai & Nisshinbo Industries, Inc.
    Inventors: Hirofusa Shirai, Naomi Masuda, Tatsuya Hongu, Nobuhisa Tsutsumi