Patents by Inventor Shin To

Shin To 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: 8575302
    Abstract: A composition which comprises polylactide and has excellent heat stability, color and hydrolytic resistance. The composition comprises (i) polylactide, (ii) a metal catalyst and (iii) a hypophosphorous acid-based deactivator or a metaphosphoric acid-based deactivator.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: November 5, 2013
    Assignees: Teijin Limited, Musashino Chemical Laboratory, Ltd.
    Inventors: Hirotaka Suzuki, Kiyotsuna Toyohara, Shin To
  • Patent number: 8299148
    Abstract: An object of the present invention is to provide a fiber made of polylactic acid and having excellent strength, heat resistance and heat shrinkage resistance and a manufacturing method thereof. The present invention relates to the fiber is made of a composition which includes (i) poly(L-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component A), (ii) poly(D-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component B) and (iii) 0.01 to 5 parts by weight of a phosphate metal salt (component C) based on 100 parts by weight of the total of the components A and B and has a strength of 2.5 to 10 cN/dTex and a manufacturing method thereof.
    Type: Grant
    Filed: September 3, 2007
    Date of Patent: October 30, 2012
    Assignees: Teijin Limited, Musashino Chemical Laboratory, Ltd.
    Inventors: Midori Ikegame, Takaaki Matsuda, Shin To
  • Patent number: 8163849
    Abstract: It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, including the steps of: (i) obtaining a solid by kneading together poly(L-lactic acid) and poly(D-lactic acid) at a temperature of 160 to 225° C. and crystallizing the kneaded product; and (ii) melt kneading the obtained solid.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: April 24, 2012
    Assignee: Teijin Limited
    Inventors: Kiyotsuna Toyohara, Midori Ikegame, Hideki Yamane, Yoshiharu Kimura, Daisuke Masaki, Shin To
  • Patent number: 8030382
    Abstract: It is an object of the present invention to provide a polylactic acid composition having excellent crystallinity, wet heat stability and melt stability. It is another object of the present invention to provide a molded article which is obtained from the polylactic acid composition and excellent in appearance and color. The present invention is a composition and molded article thereof which comprises a polylactic acid (component A), a carbodiimide compound (component B) and a phosphoric acid ester metal salt (component C).
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: October 4, 2011
    Assignees: Teijin Limited, Musashino Chemical Laboratory, Ltd.
    Inventors: Kohei Endo, Hirotaka Suzuki, Takaaki Matsuda, Shin To
  • Publication number: 20100120991
    Abstract: It is an object of the present invention to provide a composition comprising polylactic acid and having improved injection moldability and an injection molded product thereof. The object of the present invention is attained by a specific polylactic acid composition which meets the following requirements (a) to (g) at the same time: (a) it must have a weight average molecular weight of 70,000 to 700,000; (b) the total content of Sn atom, Ti atom, Al atom and Ca atom must be 3 to 20 ppm; (c) it must contain a P atom in an amount of 3 to 3,000 ppm; (d) the (total number of gram-atoms of Sn, Ti, Al and Ca)/(number of gram-atoms of P) value must be 0.01 to 5; (e) the content of a compound having a molecular weight of 150 or less must be not more than 0.2 wt %; (f) the COOH terminal group concentration must be not more than 30 equivalents/ton; and (g) the melt viscosity (P) at a melting temperature of 230° C. must satisfy the following expression (1): 10 Pa·s<P<100 Pa·s??(1).
    Type: Application
    Filed: March 31, 2008
    Publication date: May 13, 2010
    Applicants: TEIJIN LIMITED, MUSASHINO CHEMICAL LABORATORY ,
    Inventors: Kiyotsuna Toyohara, Ryuji Nonokawa, Kohei Endo, Shin To
  • Publication number: 20100093888
    Abstract: It is an object of the present invention to provide a polylactic acid composition having excellent crystallinity, wet heat stability and melt stability. It is another object of the present invention to provide a molded article which is obtained from the polylactic acid composition and excellent in appearance and color. The present invention is a composition and molded article thereof which comprises a polylactic acid (component A), a carbodiimide compound (component B) and a phosphoric acid ester metal salt (component C).
    Type: Application
    Filed: February 21, 2008
    Publication date: April 15, 2010
    Applicants: TEIJIN LIMITED, MUSASHINO CHEMICAL LABORATORY, LTD.
    Inventors: Kohei Endo, Hirotaka Suzuki, Takaaki Matsuda, Shin To
  • Publication number: 20100093889
    Abstract: An object of the present invention is to provide a composition containing polylactic acid and having improved blow moldability and a blow molded product thereof. The polylactic acid composition meets the following requirements (a) to (g) at the same time: (a) the weight average molecular weight must be 70,000 to 700,000; (b) the total content (metal content) of Sn atom, Ti atom, Al atom and Ca atom must be 3 to 20 ppm; (c) the content of P atom must be 3 to 3,000 ppm; (d) the (total number of gram-atoms of Sn, Ti, Al and Ca)/(number of gram-atoms of P) value must be 0.01 to 5; (e) the content of a compound having a molecular weight of 150 or less must be not more than 0.2 wt %; (f) the COOH terminal group concentration must be not more than 30 equivalents/ton; and (g) the following expressions (1) and (2) must be satisfied: 10 Pa·s<P<100 Pa·s??(1) 10 MPa<S??(2) (P is a melt viscosity at 230° C. and S is a stress at 150° C.).
    Type: Application
    Filed: March 31, 2008
    Publication date: April 15, 2010
    Applicants: Teijin Limited, Musashino Chemical Laboratory, Ltd.
    Inventors: Kiyotsuna Toyohara, Ryuji Nonokawa, Kohei Endo, Midori Ikegame, Shin To
  • Publication number: 20100056751
    Abstract: It is an object of the present invention to produce a polylactic acid having a high molecular weight such as a weight average molecular weight (Mw) of more than 100,000 from which only a stereocomplex crystal is grown even by repeating melting and crystallization. The present invention is a process of producing a polylactic acid, including the steps of: (i) obtaining a solid by kneading together poly(L-lactic acid) and poly(D-lactic acid) at a temperature of 160 to 225° C. and crystallizing the kneaded product; and (ii) melt kneading the obtained solid.
    Type: Application
    Filed: February 6, 2008
    Publication date: March 4, 2010
    Inventors: Kiyotsuna Toyohara, Midori Ikegame, Hideki Yamane, Yoshiharu Kimura, Daisuke Masaki, Shin To
  • Publication number: 20100004362
    Abstract: An object of the present invention is to provide a fiber made of polylactic acid and having excellent strength, heat resistance and heat shrinkage resistance and a manufacturing method thereof. The present invention relates to the fiber is made of a composition which comprises (i) poly(L-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component A), (ii) poly(D-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component B) and (iii) 0.01 to 5 parts by weight of a phosphate metal salt (component C) based on 100 parts by weight of the total of the components A and B and has a strength of 2.5 to 10 cN/dTex and a manufacturing method thereof.
    Type: Application
    Filed: September 3, 2007
    Publication date: January 7, 2010
    Applicants: TEIJIN LIMITED, MUSASHINO CHEMICAL LABORATORY , LTD.
    Inventors: Midori Ikegame, Takaaki Matsuda, Shin To
  • Publication number: 20090234094
    Abstract: A composition which comprises polylactide and has excellent heat stability, color and hydrolytic resistance. The composition comprises (i) polylactide, (ii) a metal catalyst and (iii) a hypophosphorous acid-based deactivator or a metaphosphoric acid-based deactivator.
    Type: Application
    Filed: October 4, 2006
    Publication date: September 17, 2009
    Inventors: Hirotaka Suzuki, Kiyotsuna Toyohara, Shin To