Patents by Inventor Takamasa Kawashima

Takamasa Kawashima 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).

  • Process for producing polyester resins
    Patent number: 6927275
    Abstract: The process of the present invention for producing a polyester resin comprising a dicarboxylic acid constitutional unit and a diol constitutional unit having a cyclic acetal skeleton comprises a step (1) of subjecting a diol (A) having a cyclic acetal skeleton and an ester (D) to transesterification reaction and a step (2) of mainly converting the resultant oligomer into a high polymer. The step (1) simultaneously satisfies the requirements (i) to (iv) as described in the specification. In the process of the present invention, the polyester resins having excellent moldability and mechanical properties are stably produced by a transesterification method which is less detrimental to environments.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: August 9, 2005
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Takeshi Hirokane, Tsuyoshi Ikeda, Shojiro Kuwahara, Takamasa Kawashima, Tomohito Oyama
  • Vinyl-polymerizable monomer having tertiary hydroxyl group and polymer
    Publication number: 20040167309
    Abstract: The monomer of the present invention is represented by the following Formula 1: 1
    Type: Application
    Filed: March 1, 2004
    Publication date: August 26, 2004
    Inventors: Nobuya Saegusa, Akihiro Honma, Hajime Yamada, Takamasa Kawashima, Shojiro Kuwahara
  • Process for producing polyester resins
    Publication number: 20040059084
    Abstract: The process of the present invention for producing a polyester resin comprising a dicarboxylic acid constitutional unit and a diol constitutional unit having a cyclic acetal skeleton comprises a step (1) of subjecting a diol (A) having a cyclic acetal skeleton and an ester (D) to transesterification reaction and a step (2) of mainly converting the resultant oligomer into a high polymer. The step (1) simultaneously satisfies the requirements (i) to (iv) as described in the specification. In the process of the present invention, the polyester resins having excellent moldability and mechanical properties are stably produced by a transesterification method which is less detrimental to environments.
    Type: Application
    Filed: September 11, 2003
    Publication date: March 25, 2004
    Inventors: Takeshi Hirokane, Tsuyoshi Ikeda, Shojiro Kuwahara, Takamasa Kawashima, Tomohito Oyama
  • Vinyl-polymerizable monomer having tertiary hydroxyl group and polymer
    Publication number: 20030040593
    Abstract: The monomer of the present invention is represented by the following Formula 1: 1
    Type: Application
    Filed: April 16, 2002
    Publication date: February 27, 2003
    Inventors: Nobuya Saegusa, Akihiro Honma, Hajime Yamada, Takamasa Kawashima, Shojiro Kuwahara