Patents Assigned to Aies Co. Ltd.
  • Patent number: 7306738
    Abstract: There is provided a method for deionizing a decomposition produced solution resulting from decomposition of a polyester by ethylene glycol. The ester interchange reaction and hydrolysis reaction along with cation removing treatment of a decomposition product resulting from decomposition of a polyester by ethylene glycol are suppressed. Thereby, a method for deionizing the decomposition produced solution with small reductions in yield and purity can be provided.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: December 11, 2007
    Assignee: Aies Co., Ltd.
    Inventors: Shuji Inada, Kikuchi Sato
  • Patent number: 7193104
    Abstract: An aromatic polyester is pre-decomposed by heating together with bis-?-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bis-?-hydroxyethyl terephthalate and/or a low condensate thereof. The thus obtained solution composition, that is, bis-?-hydroxyethyl terephthalate solution composition containing ethylene glycol, bis-?-hydroxyethyl terephthalate and cations and/or anions as impurities is brought into contact with a cation exchanger and/or an anion exchanger to remove cations and anions as impurities to produce bis-?-hydroxyethyl terephthalate having a small content of ions.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: March 20, 2007
    Assignee: Aies Co., Ltd.
    Inventors: Shuji Inada, Kikuchi Sato
  • Patent number: 7030264
    Abstract: Bis-?-hydroxyethyl terephthalate having an optical density measured in a 10 wt % methanol solution at a measurement wavelength of 380 nm and a cell optical path length of 10 mm of 0.000 to 0.006. The present invention makes it clear that purified BHET having an optical density of 0.006 or less provides high-quality PET having excellent purity, whiteness and transparency.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 18, 2006
    Assignee: Aies Co. Ltd.
    Inventors: Shuji Inada, Kikuchi Sato
  • Patent number: 6710202
    Abstract: To provide a process for producing a high-purity bis-&bgr;-hydroxyethyl terephthalate from crude terephthalic acid.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: March 23, 2004
    Assignee: Aies Co., Ltd.
    Inventors: Shuji Inada, Kikuchi Sato
  • Publication number: 20040019234
    Abstract: An aromatic polyester is pre-decomposed by heating together with bis-&bgr;-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bis-&bgr;-hydroxyethyl terephthalate and/or a low condensate thereof.
    Type: Application
    Filed: July 18, 2003
    Publication date: January 29, 2004
    Applicant: AIES CO., LTD.
    Inventors: Shuji Inada, Kikuchi Sato
  • Patent number: 6645445
    Abstract: A process for efficiently removing titanium oxide or red oxide from an ethylene glycol solvolysis product of a polyester containing titanium oxide or red oxide. The process comprises the steps of: (1) mixing at least one calcium compound selected from the group consisting of calcium oxide, calcium carbonate and calcium hydroxide with a polyester decomposition product containing titanium oxide which is an ethylene glycol solvolysis product of a polyester containing titanium oxide to agglomerate titanium oxide contained in the polyester decomposition product, or mixing titanium oxide with a polyester decomposition product containing red oxide which is an ethylene glycol solvolysis product of a polyester containing red oxide to agglomerate red oxide contained in the polyester decomposition product; and (2) subjecting the agglomerates to solid-liquid separation to remove titanium oxide or red oxide from the polyester decomposition product.
    Type: Grant
    Filed: May 3, 2001
    Date of Patent: November 11, 2003
    Assignee: Aies Co., Ltd.
    Inventors: Shuji Inada, Kikuchi Sato
  • Patent number: 6642350
    Abstract: A container made of, e.g., polyethylene terephthalate is pulverized and decomposed in the presence of a catalyst by the use of a solvent such as an alcohol or glycol to obtain crude bishydroxyalkyl terephthalate. This crude bishydroxyalkyl terephthalate is then purified by filtration, a treatment with activated carbon, and a treatment with ion-exchange resins. The bishydroxyalkyl terephthalate thus obtained is condensed to produce a container or the like made of polyethylene terephthalate.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: November 4, 2003
    Assignees: Organo Corporation, Aies Co., Ltd.
    Inventors: Yuji Asakawa, Shin Asano
  • Patent number: 6350851
    Abstract: A method of producing a polyester from high-purity bis-&bgr;-hydroxyethyl terephthalate as a raw material containing cations and anions in trace amounts. Polyester production raw materials including bis-&bgr;-hydroxyethyl terephthalate containing cations and anions in a total weight of not more than 50 ppm, ethylene glycol and antimony trioxide and/or germanium dioxide as a polymerization catalyst are heated without substantially distilling off ethylene glycol and then heated under reduced pressure to be polycondensed while ethylene glycol is distilled off.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: February 26, 2002
    Assignee: AIES Co., Ltd.
    Inventors: Shuji Inada, Kikuchi Sato