Patents by Inventor Muneaki Aminaka

Muneaki Aminaka 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: 9321884
    Abstract: A method for producing a condensation polymerization reaction polymer, comprising a guide polymerization step in which a molten prepolymer is supplied to the top edge of a wire guide to obtain the condensation polymerization reaction polymer, the wire guide comprising a vertical wire group consisting of a plurality of vertical wires extending in the vertical direction, which are mutually spaced in alignment at an arrangement pitch L1 (mm). In the guide polymerization step, the molten prepolymer aggregates so that a molten prepolymer mass is formed on the vertical wire, and a molten prepolymer mass is formed wherein, the width of the molten prepolymer mass measured in an alignment direction of the vertical wires at a position 200 mm below the top edge being represented as L2 (mm), the width L2 of at least a portion of the molten prepolymer mass satisfies the inequality (1).
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: April 26, 2016
    Assignee: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Hiroshi Hachiya, Yoko Hachiya, Muneaki Aminaka, Kazuharu Yasuda
  • Patent number: 8293162
    Abstract: A method for producing a molded product consisting of a resin polymerized by a melt polycondensation reaction, comprising continuous feeding of a prepolymer in molten state from a prepolymer feeding port to a polymerization reactor, discharging from holes of a porous plate, followed by polymerization while dropping along a supporting substrate under reduced pressure, and molding by transferring to at least one molding machine in molten state without solidification, wherein transfer pressure to said molding machine is controlled so as to maintain at an arbitrary pressure from 0.1 to 100 MPa (absolute pressure).
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: October 23, 2012
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Hiroshi Yokoyama, Hiroshige Okamoto, Muneaki Aminaka, Kouji Takeuchi, Hironobu Yamauchi, Ken Someya
  • Patent number: 8202591
    Abstract: A polyethylene terephthalate resin which is obtained by melt polymerization at a reduced pressure or in an inert gas atmosphere and has the following properties (A) to (F): (A) the intrinsic viscosity [?] is 0.4-2.5 Dl/g; (B) the content of carboxy groups present at polymer ends is 30 meq/kg or lower; (C) the acetaldehyde content is 10 ppm or lower; (D) a hexafluoroisopropanol solution of the resin, when analyzed by the transmission method, has a hue which has an L value of 99 or larger and a b value of 0.4 or smaller; (E) the Mw/Mn is 1.8-2.3; and (F) the cyclic trimer content is 5 wt. % or lower.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: June 19, 2012
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Hiroshi Yokoyama, Hiroshige Okamoto, Muneaki Aminaka
  • Publication number: 20110301304
    Abstract: A method for producing a polycondensation polymer, which comprises: introducing a prepolymer of a polycondensation polymer into a polymerization reactor through a feed opening in a molten state; discharging the introduced prepolymer through holes of a perforated plate; and then polycondensing the prepolymer under reduced pressure, while allowing the prepolymer to fall along a support, wherein the perforated plate has two or more areas and polycondensation is performed by introducing a prepolymer and/or a polymer modifier into each of the areas and discharging the introduced prepolymer and/or polymer modifier through holes of each of the areas.
    Type: Application
    Filed: May 20, 2011
    Publication date: December 8, 2011
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Hiroshi Yokoyama, Muneaki Aminaka
  • Patent number: 8013107
    Abstract: The present invention provides a method of producing polyalkylene terephthalate, which comprises: introducing a prepolymer of polyalkylene terephthalate that is in a molten state comprising 70 mol % or more of ethylene terephthalate or 1,4-butylene terephthalate repeating units and having an intrinsic viscosity [?] between 0.2 and 2 dl/g through a feed opening to a polymerization reactor; discharging the introduced prepolymer from holes of a perforated plate; and polymerizing the prepolymer under reduced pressure, while allowing the prepolymer to fall along the surface of a support that is open towards the outside at a temperature between the [crystalline melting point?10° C.] of the prepolymer or higher and the [crystalline melting point+30° C.] of the prepolymer or lower under the conditions represented by a formula S1/S2>1, wherein S1 is the surface area of falling polyalkylene terephthalate, and S2 is the area where the support is in contact with polyalkylene terephthalate.
    Type: Grant
    Filed: October 7, 2004
    Date of Patent: September 6, 2011
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Hiroshi Yokoyama, Katsuhiro Fujimoto, Muneaki Aminaka, Junichi Sugimoto, Tsutomu Katsumata
  • Patent number: 7807728
    Abstract: Disclosed is a method for recycling a recovered polycondensation polymer which comprises a process wherein a recovered polycondensation polymer is supplied in a molten state to a polymerizer having a porous plate, and then after ejecting the polycondensation polymer through pores of the porous plate, the polymerization degree of the polycondensation polymer is increased under a reduced pressure or in a reduced inert gas atmosphere while dropping the polycondensation polymer along a supporting body.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: October 5, 2010
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Hiroshi Yokoyama, Muneaki Aminaka, Ken Someya
  • Publication number: 20080274320
    Abstract: The present invention provides a method of producing polyalkylene terephthalate, which comprises: introducing a prepolymer of polyalkylene terephthalate that is in a molten state comprising 70 mol % or more of ethylene terephthalate or 1,4-butylene terephthalate repeating units and having an intrinsic viscosity [?] between 0.2 and 2 dl/g through a feed opening to a polymerization reactor; discharging the introduced prepolymer from holes of a perforated plate; and polymerizing the prepolymer under reduced pressure, while allowing the prepolymer to fall along the surface of a support that is open towards the outside at a temperature between the [crystalline melting point?10° C.] of the prepolymer or higher and the [crystalline melting point+30° C.] of the prepolymer or lower under the conditions represented by a formula S1/S2>1, wherein S1 is the surface area of falling polyalkylene terephthalate, and S2 is the area where the support is in contact with polyalkylene terephthalate.
    Type: Application
    Filed: October 7, 2004
    Publication date: November 6, 2008
    Inventors: Hiroshi Yokoyama, Katsuhiro Fujimoto, Muneaki Aminaka, Junichi Sugimoto, Tsutomu Katsumata
  • Publication number: 20080260979
    Abstract: A polyethylene terephthalate resin which is obtained by melt polymerization at a reduced pressure or in an inert gas atmosphere and has the following properties (A) to (F): (A) the intrinsic viscosity [?] is 0.4-2.5 Dl/g; (B) the content of carboxy groups present at polymer ends is 30 meq/kg or lower; (C) the acetaldehyde content is 10 ppm or lower; (D) a hexafluoroisopropanol solution of the resin, when analyzed by the transmission method, has a hue which has an L value of 99 or larger and a b value of 0.4 or smaller; (E) the Mw/Mn is 1.8-2.3; and (F) the cyclic trimer content is 5 wt. % or lower.
    Type: Application
    Filed: November 29, 2005
    Publication date: October 23, 2008
    Inventors: Hiroshi Yokoyama, Hiroshige Okamoto, Muneaki Aminaka
  • Publication number: 20080249200
    Abstract: An object of the present invention is to provide a method of producing a solution of a thermoplastic polymer such as a polyester resin and/or a solution of a depolymerization product of a thermoplastic polymer by efficiently dissolving the thermoplastic polymer and/or the depolymerization product of the thermoplastic polymer. The method of producing a solution of a thermoplastic polymer and/or a solution of a depolymerization product of a thermoplastic polymer, which includes supplying a thermoplastic polymer, in a melted state, from a raw material supply port to an interior of a reactor, discharging the polymer through holes of a perforated plate, and then bringing the polymer into contact with a solvent vapor while flowing down along the surface of a support disposed inside the reactor.
    Type: Application
    Filed: February 28, 2006
    Publication date: October 9, 2008
    Applicant: Asahi Kasei Chemicals Corporation
    Inventors: Hiroshi Yokoyama, Muneaki Aminaka
  • Publication number: 20080146685
    Abstract: Disclosed is a method for recycling a recovered polycondensation polymer which comprises a process wherein a recovered polycondensation polymer is supplied in a molten state to a polymerizer having a porous plate, and then after ejecting the polycondensation polymer through pores of the porous plate, the polymerization degree of the polycondensation polymer is increased under a reduced pressure or in a reduced inert gas atmosphere while dropping the polycondensation polymer along a supporting body.
    Type: Application
    Filed: December 19, 2005
    Publication date: June 19, 2008
    Inventors: Hiroshi Yokoyama, Muneaki Aminaka, Ken Someya
  • Publication number: 20080128949
    Abstract: A method for producing a molded product consisting of a resin polymerized by a melt polycondensation reaction, comprising continuous feeding of a prepolymer in molten state from a prepolymer feeding port to a polymerization reactor, discharging from holes of a porous plate, followed by polymerization while dropping along a supporting substrate under reduced pressure, and molding by transferring to at least one molding machine in molten state without solidification, wherein transfer pressure to said molding machine is controlled so as to maintain at an arbitrary pressure from 0.1 to 100 MPa (absolute pressure).
    Type: Application
    Filed: November 29, 2005
    Publication date: June 5, 2008
    Inventors: Hiroshi Yokoyama, Hiroshige Okamoto, Muneaki Aminaka, Kouji Takeuchi, Hironobu Yamauchi, Ken Someya
  • Publication number: 20080090975
    Abstract: A method for producing a polycondensation polymer, which comprises: introducing a prepolymer of a polycondensation polymer into a polymerization reactor through a feed opening in a molten state; discharging the introduced prepolymer through holes of a perforated plate; and then polycondensing the prepolymer under reduced pressure, while allowing the prepolymer to fall along a support, wherein the perforated plate has two or more areas and polycondensation is performed by introducing a prepolymer and/or a polymer modifier into each of the areas and discharging the introduced prepolymer and/or polymer modifier through holes of each of the areas.
    Type: Application
    Filed: November 25, 2005
    Publication date: April 17, 2008
    Inventors: Hiroshi Yokoyama, Muneaki Aminaka
  • Patent number: 6320015
    Abstract: Disclosed is a method for producing an aromatic polycarbonate, which comprises treating a molten aromatic polycarbonate prepolymer (obtained by reacting an aromatic dihydroxy compound with a diaryl carbonate) with an inert gas under a predetermined pressure to thereby cause the molten prepolymer to absorb the inert gas, and subjecting the resultant molten prepolymer having the inert gas absorbed therein to polymerization, under a pressure lower than the above-mentioned predetermined pressure employed for the inert gas absorption, to thereby polymerize the prepolymer to a predetermined degree of polymerization. By the method of the present invention, a high quality aromatic polycarbonate which is colorless and has excellent mechanical properties can be produced at high polymerization rate even without using a large amount of an inert gas.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: November 20, 2001
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kyosuke Komiya, Shinsuke Fukuoka, Muneaki Aminaka, Kazumi Hasegawa
  • Patent number: 6265526
    Abstract: Disclosed is a system for producing a polycondensation polymer comprising (A) an inert gas absorption device for causing a molten polycondensation prepolymer to absorb an inert gas to thereby obtain (&agr;) a molten prepolymer having the inert gas absorbed therein, (B) a polymerizer device for polymerizing inert gas-absorbed molten prepolymer (&agr;) under reduced pressure, and (C) a pipe for transferring inert gas-absorbed molten prepolymer (&agr;) from absorption device (A) to polymerizer device (B), wherein absorption device (A) and polymerizer device (B) are arranged in this order and connected to each other through pipe (C). Also disclosed is a method for producing a polycondensation polymer by using the above-mentioned system. By the use of the system or method of the present invention, it has become possible to produce a colorless, high quality polycondensation polymer at high polymerization rate even without using a large amount of an inert gas.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: July 24, 2001
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kyosuke Komiya, Muneaki Aminaka
  • Patent number: 5952449
    Abstract: A method for producing an aromatic polycarbonate, which comprises subjecting to a transesterification polymerization reaction at least one polymerizable material for an aromatic polycarbonate. The transesterification polymerization reaction is performed in one or more polymerizers which is or are connected through a pipeline system. The pipeline system comprises one or more pipes through which a molten aromatic polycarbonate having a number average molecular weight increased by the transesterification polymerization reaction is passed while contacting an inner wall of the pipe or pipes. The pipeline system has at least one viscous polycarbonate passage region in which a molten aromatic polycarbonate having a number average molecular weight of 4,000 or more is passed through the pipe. The pipes in the viscous polycarbonate passage region of the pipeline system have no bent portion or not more than 50 bent portions in total.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: September 14, 1999
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Muneaki Aminaka, Kyosuke Komiya, Kazumi Hasegawa
  • Patent number: 5912318
    Abstract: A method for producing an aromatic polycarbonate which comprises subjecting to a transesterification polymerization reaction at least one polymerizable material for an aromatic polycarbonate, the transesterification reaction being performed in one or more polymerizers which is or are connected through a pipeline system toward an outlet for a final aromatic polycarbonate product, wherein the pipeline system comprises one or more pipes, through which a molten aromatic polycarbonate having a number average molecular weight increased by the transesterification polymerization reaction is passed while contacting an inner wall of the pipe or pipes, the pipeline system having at least one viscous polycarbonate passage region in which a molten aromatic polycarbonate having a number average molecular weight of 6,000 or more is passed through the pipe, wherein the pipe in the at least one viscous polycarbonate passage region is heated to provide a temperature difference in the range of from -3.degree. C. to 50.degree.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: June 15, 1999
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Kazumi Hasegawa, Kyosuke Komiya, Muneaki Aminaka
  • Patent number: 4399272
    Abstract: A process for producing a polyacetal copolymer, which comprises copolymerizing formaldehyde and a compound selected from the group consisting of alkylene oxides, poly(alkylene oxides), cyclic formals and poly (cyclic formals) in the presence of a Lewis acid and an anionic polymerization catalyst with the exception of metal chelate compounds.
    Type: Grant
    Filed: November 4, 1980
    Date of Patent: August 16, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Minoru Hamada, Kazuhiko Matsuzaki, Muneaki Aminaka