Patents by Inventor Katsunori Yabuta
Katsunori Yabuta 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).
-
Publication number: 20150118472Abstract: A process includes the steps of: casting or coating a polyamic acid organic solvent solution on a support and drying the polyamic acid organic solvent solution thereon, so as to form a partially cured and/or partially dried polyamic acid film; dipping the polyamic acid film in tertiary amine or a solution of tertiary amine, or coating tertiary amine or a solution of tertiary amine on the polyamic acid film; and drying the film while imidizing the polyamic acid. In another process, a chemical converting agent and a catalyst are mixed in an organic solvent solution of polyamic acid. After casting and heating the mixture on a support, a partially cured and/or partially dried polyamic acid film is detached from the support. The film contains, with respect to the remaining volatile component, not less than 50 parts of catalyst, not more than 30 parts of solvent, and not more than 20 parts of chemical converting agent and/or a chemical converting agent derived component.Type: ApplicationFiled: December 24, 2014Publication date: April 30, 2015Applicant: KANEKA CORPORATIONInventors: Hisayasu Kaneshiro, Toshihisa Itoh, Katsunori Yabuta, Kiyokazu Akahori
-
Patent number: 8962790Abstract: A process includes the steps of: casting or coating a polyamic acid organic solvent solution on a support and drying the polyamic acid organic solvent solution thereon, so as to form a partially cured and/or partially dried polyamic acid film; dipping the polyamic acid film in tertiary amine or a solution of tertiary amine, or coating tertiary amine or a solution of tertiary amine on the polyamic acid film; and drying the film while imidizing the polyamic acid. In another process, a chemical converting agent and a catalyst are mixed in an organic solvent solution of polyamic acid. After casting and heating the mixture on a support, a partially cured and/or partially dried polyamic acid film is detached from the support. The film contains, with respect to the remaining volatile component, not less than 50 parts of catalyst, not more than 30 parts of solvent, and not more than 20 parts of chemical converting agent and/or a chemical converting agent derived component.Type: GrantFiled: February 13, 2007Date of Patent: February 24, 2015Assignee: Kaneka CorporationInventors: Hisayasu Kaneshiro, Toshihisa Itoh, Katsunori Yabuta, Kiyokazu Akahori
-
Patent number: 8273851Abstract: A method for producing a polyimide film comprises the steps of: preparing a polar organic solvent solution of a polyimide precursor obtained by mixing a tetracarboxylic acid dianhydride compound and a diamine compound; adding a dehydrating agent and an imidization catalyst to the polar organic solvent solution so as to prepare a resin solution composition; and drying the resin solution composition by heating so as to imidize the resin solution composition after flowing the resin solution composition onto a support in a casting manner, wherein diethyl pyridine is used as the imidization catalyst. According to the production method, it is possible to obtain a polyimide film which is highly productive and is excellent in the film quality such as the mechanical property, the adhesive strength, and the like.Type: GrantFiled: August 17, 2011Date of Patent: September 25, 2012Assignee: Kaneka CorporationInventor: Katsunori Yabuta
-
Publication number: 20120001367Abstract: A method for producing a polyimide film comprises the steps of: preparing a polar organic solvent solution of a polyimide precursor obtained by mixing a tetracarboxylic acid dianhydride compound and a diamine compound; adding a dehydrating agent and an imidization catalyst to the polar organic solvent solution so as to prepare a resin solution composition; and drying the resin solution composition by heating so as to imidize the resin solution composition after flowing the resin solution composition onto a support in a casting manner, wherein diethyl pyridine is used as the imidization catalyst. According to the production method, it is possible to obtain a polyimide film which is highly productive and is excellent in the film quality such as the mechanical property, the adhesive strength, and the like.Type: ApplicationFiled: August 17, 2011Publication date: January 5, 2012Applicant: Kaneka CorporationInventor: Katsunori Yabuta
-
Patent number: 8026338Abstract: A method for producing a polyimide film comprises the steps of: preparing a polar organic solvent solution of a polyimide precursor obtained by mixing a tetracarboxylic acid dianhydride compound and a diamine compound; adding a dehydrating agent and an imidization catalyst to the polar organic solvent solution so as to prepare a resin solution composition; and drying the resin solution composition by heating so as to imidize the resin solution composition after flowing the resin solution composition onto a support in a casting manner, wherein diethyl pyridine is used as the imidization catalyst. According to the production method, it is possible to obtain a polyimide film which is highly productive and is excellent in the film quality such as the mechanical property, the adhesive strength, and the like.Type: GrantFiled: February 23, 2006Date of Patent: September 27, 2011Assignee: Kaneka CorporationInventor: Katsunori Yabuta
-
Publication number: 20080004422Abstract: A method for producing a polyimide film comprises the steps of: preparing a polar organic solvent solution of a polyimide precursor obtained by mixing a tetracarboxylic acid dianhydride compound and a diamine compound; adding a dehydrating agent and an imidization catalyst to the polar organic solvent solution so as to prepare a resin solution composition; and drying the resin solution composition by heating so as to imidize the resin solution composition after flowing the resin solution composition onto a support in a casting manner, wherein diethyl pyridine is used as the imidization catalyst. According to the production method, it is possible to obtain a polyimide film which is highly productive and is excellent in the film quality such as the mechanical property, the adhesive strength, and the like.Type: ApplicationFiled: February 23, 2006Publication date: January 3, 2008Applicant: KANEKA CORPORATIONInventor: Katsunori Yabuta
-
Publication number: 20070129533Abstract: A process includes the steps of: casting or coating a polyamic acid organic solvent solution on a support and drying the polyamic acid organic solvent solution thereon, so as to form a partially cured and/or partially dried polyamic acid film; dipping the polyamic acid film in tertiary amine or a solution of tertiary amine, or coating tertiary amine or a solution of tertiary amine on the polyamic acid film; and drying the film while imidizing the polyamic acid. In another process, a chemical converting agent and a catalyst are mixed in an organic solvent solution of polyamic acid. After casting and heating the mixture on a support, a partially cured and/or partially dried polyamic acid film is detached from the support. The film contains, with respect to the remaining volatile component, not less than 50 parts of catalyst, not more than 30 parts of solvent, and not more than 20 parts of chemical converting agent and/or a chemical converting agent derived component.Type: ApplicationFiled: February 13, 2007Publication date: June 7, 2007Applicant: KANEKA CORPORATIONInventors: Hisayasu KANESHIRO, Toshihisa ITOH, Katsunori YABUTA, Kiyokazu AKAHORI
-
Patent number: 6746639Abstract: There is provided a process for preparing a polyimide film by a method of casting a film, wherein bubble inclusion and unevenness in thickness are prevented without decrease in mechanical strength at the same time. It is an object of the present invention to provided a process for preparing a polyimide film characterized by extruding, casting and forming into a film a composition of a resin solution obtained by adding, to low viscosity varnish obtained by polymerizing a tetracarboxylic dianhydride component with a diamine component in a molar ratio of 1:1.01 to 1:1.05, or 1:0.95 to 1:0.99, a dehydrating agent in a molar ratio of at least one time and a chemically-imidizing catalyst in a molar ratio of at least half time based on 1 mole of the amic acid of the poly(amic acid) varnish.Type: GrantFiled: September 11, 2001Date of Patent: June 8, 2004Assignee: Kaneka CorporationInventors: Katsunori Yabuta, Kiyokazu Akahori
-
Publication number: 20040063900Abstract: A process includes the steps of: casting or coating a polyamic acid organic solvent solution on a support and drying the polyamic acid organic solvent solution thereon, so as to form a partially cured and/or partially dried polyamic acid film; dipping the polyamic acid film in tertiary amine or a solution of tertiary amine, or coating tertiary amine or a solution of tertiary amine on the polyamic acid film; and drying the film while imidizing the polyamic acid. In another process, a chemical converting agent and a catalyst are mixed in an organic solvent solution of polyamic acid. After casting and heating the mixture on a support, a partially cured and/or partially dried polyamic acid film is detached from the support. The film contains, with respect to the remaining volatile component, not less than 50 parts of catalyst, not more than 30 parts of solvent, and not more than 20 parts of chemical converting agent and/or a chemical converting agent derived component.Type: ApplicationFiled: August 18, 2003Publication date: April 1, 2004Inventors: Hisayasu Kaneshiro, Toshihisa Itoh, Katsunori Yabuta, Kiyokazu Akahori
-
Publication number: 20020074686Abstract: There is provided a process for preparing a polyimide film by a method of casting a film, wherein bubble inclusion and unevenness in thickness are prevented without decrease in mechanical strength at the same time. It is an object of the present invention to provided a process for preparing a polyimide film characterized by extruding, casting and forming into a film a composition of a resin solution obtained by adding, to low viscosity varnish obtained by polymerizing a tetracarboxylic dianhydride component with a diamine component in a molar ratio of 1:1.01 to 1:1.05, or 1:0.95 to 1:0.99, a dehydrating agent in a molar ratio of at least one time and a chemically-imidizing catalyst in a molar ratio of at least half time based on 1 mole of the amic acid of the poly(amic acid) varnish.Type: ApplicationFiled: September 11, 2001Publication date: June 20, 2002Inventors: Katsunori Yabuta, Kiyokazu Akahori
-
Patent number: 6403757Abstract: A reaction between epoxy-terminated polyamide and an acid anhydride compound can yield a modified polyamide resin, into resin skeleton of which carboxy groups to react with epoxy resin are introduced. An adhesive agent having excellent heat-resistance can be provided by the use of a composition of this modified polyamide resin and epoxy resin. Furthermore, an adhesive tape for a semiconductor device having excellent properties can be produced by laminating the adhesive agent and the protective layer on one surface of an organic insulated film.Type: GrantFiled: January 7, 2000Date of Patent: June 11, 2002Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaisahInventors: Katsunori Yabuta, Kiyokazu Akahori, Yasushi Nishikawa
-
Patent number: 5726281Abstract: An epoxy-terminated polyamide having the following structure: ##STR1## where each of R.sub.1, R.sub.2, and R.sub.3 is a divalent organic group, and each of n and m is a natural number, and an adhesive containing the above epoxy-terminated polyamide, an epoxy resin and a curing agent. The epoxy-terminate polyamide is well compatible with epoxy resins and an adhesive containing the same is excellent in adhesiveness and thermal resistance.Type: GrantFiled: September 29, 1994Date of Patent: March 10, 1998Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Hitoshi Nojiri, Katsunori Yabuta
-
Patent number: 5371175Abstract: An epoxy-terminated polyamide having the following structure: ##STR1## where each of R.sub.1, R.sub.2, and R.sub.3 is a divalent organic group, and each of n and m is a natural number, and an adhesive containing the above epoxy-terminated polyamide, an epoxy resin and a curing agent. The epoxy-terminate polyamide is well compatible with epoxy resins and an adhesive containing the same is excellent in adhesiveness and thermal resistance.Type: GrantFiled: February 23, 1993Date of Patent: December 6, 1994Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Hitoshi Nojiri, Katsunori Yabuta