Patents Assigned to Mutual Corporation
  • Patent number: 8304490
    Abstract: It is an object of the present invention to provide polylactic acid containing a stereocomplex crystal and having excellent moldability, a high molecular weight, high crystallinity and a high melting point and a process for manufacturing the same. It is another object of the present invention to provide a composition comprising the polylactic acid and a molded product of the polylactic acid. The present invention is characterized from polylactic acid having a weight average molecular weight of 80,000 to 500,000 and a melting peak at 195° C. or higher which accounts for 80% or more of the total of melting peaks in the temperature elevation step when measured by a differential scanning calorimeter (DSC) and a process for manufacturing the same.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: November 6, 2012
    Assignees: Teijin Limited, Musashino Chemical Laboratory, Ltd, Mutual Corporation
    Inventors: Yoshiharu Kimura, Zhen Tang, Kazuki Fukushima, Kiyotsuna Toyohara, Ryuji Nonokawa, Yasuhito Maeda, Masayuki Takada, Yuka Komazawa, Tsuyoshi Aoki
  • Patent number: 8211986
    Abstract: It is an object of the present invention to provide a method for producing a polylactic acid block copolymer having high molecular weight, and in lower cost, wherein only a stereo-complex crystal is capable of growing, even when heat melting process is repeated. The present invention relates to a method for producing a polylactic acid block copolymer characterized in that (i) ring-opening polymerization of D-lactide (D component) is carried out in the presence of poly-L-lactic acid (L component), or (ii) ring-opening polymerization of L-lactide (L component) is carried out in the presence of poly-D-lactic acid (D component), and mass ratio of the D component and the L component is the D component/the L component=60/40 to 91/9, or the L component/the D component=60/40 to 91/9.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: July 3, 2012
    Assignees: Musashino Chemical Laboratory, Ltd., Mutual Corporation
    Inventors: Yuka Komazawa, Zhen Tang
  • Publication number: 20100324229
    Abstract: It is an object of the present invention to provide a method for producing a polylactic acid block copolymer having high molecular weight, and in lower cost, wherein only a stereo-complex crystal is capable of growing, even when heat melting process is repeated. The present invention relates to a method for producing a polylactic acid block copolymer characterized in that (i) ring-opening polymerization of D-lactide (D component) is carried out in the presence of poly-L-lactic acid (L component), or (ii) ring-opening polymerization of L-lactide (L component) is carried out in the presence of poly-D-lactic acid (D component), and mass ratio of the D component and the L component is the D component/the L component=60/40 to 91/9, or the L component/the D component=60/40 to 91/9.
    Type: Application
    Filed: August 10, 2004
    Publication date: December 23, 2010
    Applicants: Musashino Chemical Laboratory, Ltd., Mutual Corporation
    Inventors: Yuka Komazawa, Zhen Tang
  • Publication number: 20080161505
    Abstract: A method of manufacturing polylactic acid having excellent heat resistance and strength without using a harmful solvent and a method of manufacturing a film thereof. An aqueous emulsion of polylactic acid which is suitable for the manufacture of polylactic acid and does not contain a harmful solvent, and a coating agent containing the same. The method of manufacturing polylactic acid includes the steps of: (1) preparing an aqueous emulsion of poly-L-lactic acid and an aqueous emulsion of poly-D-lactic acid; (2) mixing them together to prepare a mixed emulsion; and (3) drying the mixed emulsion.
    Type: Application
    Filed: February 17, 2006
    Publication date: July 3, 2008
    Applicants: TEIJIN LIMITED, MUSASHINO CHEMICAL LABORATORY, LTD., MUTUAL CORPORATION, Yoshiharu KIMURA
    Inventor: Yoshiharu Kimura
  • Publication number: 20080039579
    Abstract: It is an object of the present invention to provide polylactic acid containing a stereocomplex crystal and having excellent moldability, a high molecular weight, high crystallinity and a high melting point and a process for manufacturing the same. It is another object of the present invention to provide a composition comprising the polylactic acid and a molded product of the polylactic acid. The present invention is characterized from polylactic acid having a weight average molecular weight of 80,000 to 500,000 and a melting peak at 195° C. or higher which accounts for 80% or more of the total of melting peaks in the temperature elevation step when measured by a differential scanning calorimeter (DSC) and a process for manufacturing the same.
    Type: Application
    Filed: July 20, 2005
    Publication date: February 14, 2008
    Applicants: Teijin Limited, Musashino Chemical Laboratory, Ltd., Mutual Corporation, Yoshiharu Kimura
    Inventors: Yoshiharu Kimura, Zhen Tang, Kazuki Fukushima, Kiyotsuna Toyohara, Ryuji Nonokawa, Yasuhito Maeda, Masayuki Takada, Yuka Komazawa, Tsuyoshi Aoki
  • Patent number: 6748721
    Abstract: The present provides a thermoforming system for film on blister packing machines that forms pockets without any extreme reduction of thickness of the sheet at the top face portion of the pocket and enables sheets to be placed one upon another without warping. The thermoforming system for film for blister packaging machines pinches and heats a film, fed intermittently in synchronization with an open/close drive of a pair of dies on a thermoforming system, between the dies of the thermoforming system, and partially extends the heated film along an inner circumferential face of the pocket holes of the forming die to form pockets. The dies of the thermoforming system are constructed with a forming die provided with pocket holes, a heating die provided with a plugs for locally heating only the pocket forming portion of the film F disposed facing the pocket holes of the forming die, and injecting mechanisms that inject compressed air disposed on the forming die side and the heating die side, respectively.
    Type: Grant
    Filed: August 30, 2002
    Date of Patent: June 15, 2004
    Assignee: Mutual Corporation
    Inventor: Takeshi Kodai