Title:
METHOD OF RECOVERING LACTIDE FROM POLYLACTIC ACID OR DERIVATIVE THEREOF
Document Type and Number:
WIPO Patent Application WO/2005/105775
Kind Code:
A1
Abstract:
For chemical recycling of polylactic acid or derivatives thereof or resin compositions containing them, there is provided a method of efficiently recovering or producing a lactide of high optical purity through depolymerization of polylactic acid or derivatives thereof. The method is characterized in that a mixture of polylactic acid or derivatives thereof and aluminum hydroxide is thermally decomposed at temperature falling within the range of melting temperature of polylactic acid or derivatives thereof to 320&ring C to thereby recover lactide.
Inventors:
NISHIDA HARUO (JP)
FAN YUJIANG (JP)
SHIRAI YOSHIHITO (JP)
FAN YUJIANG (JP)
SHIRAI YOSHIHITO (JP)
Application Number:
PCT/JP2005/007813
Publication Date:
November 10, 2005
Filing Date:
April 25, 2005
Export Citation:
Assignee:
KYUSHU INST TECHNOLOGY (JP)
KITAKYUSHU FOUNDATION (JP)
UNIV KINKI (JP)
NISHIDA HARUO (JP)
FAN YUJIANG (JP)
SHIRAI YOSHIHITO (JP)
KITAKYUSHU FOUNDATION (JP)
UNIV KINKI (JP)
NISHIDA HARUO (JP)
FAN YUJIANG (JP)
SHIRAI YOSHIHITO (JP)
International Classes:
C07D319/12; C08J11/16; (IPC1-7): C07D319/12; C08J11/16
Foreign References:
| JP2003192929A | 2003-07-09 | |||
| DE4325849A1 | 1995-02-02 | |||
| JPH10168077A | 1998-06-23 | |||
| JPH10306091A | 1998-11-17 | |||
| JP2000015107A | 2000-01-18 | |||
| JPH06279434A | 1994-10-04 | |||
| JPH093184A | 1997-01-07 |
Other References:
MIYAYU A. ET AL: "Poly Nyusan o Shuseibun to suru Plastic Seihin no Chemical Recycle ni tsuite.", THE SOCIETY OF CHEMICAL ENGINEERS., vol. 69, 2 March 2004 (2004-03-02), pages 234, XP002994466
SHIROI Y. ET AL: "Poly Nyusan no Chemical Recycle to Junkan Shankai System.", vol. 51, no. 3, 2003, pages 27 - 29, XP002994467
CAM D. ET AL: "Influence of residual monomers and metals on poly (L-lactide) thermal stability.", POLYMER., vol. 38, no. 8, 1997, pages 1879 - 1884, XP000685196
NODA M. ET AL: "Thermal catalytic depolymerization of poly (l-lactic acid) oligomer into l,l-lactide: Effects of Al, Ti, Zn, and Zr compounds as catalysis.", CHEM PHARM BULL., vol. 47, no. 4, 1999, pages 467 - 471, XP002989188
DEGEE P. ET AL: "Bulk polymerization of lactides initiated by aluminium isopropoxide, 3 a) Thermal stability and viscoelastic properties.", MACROMOL CHEM PHYS., vol. 198, no. 6, 1997, pages 1985 - 1995, XP000696488
FAN Y. ET AL: "Effect of Aluminum Compounds on Thermal Degradation of Poly Lactic Acid (IK10)", POLYMER PREPRINTS., vol. 53, no. 1, 10 May 2004 (2004-05-10), pages 2204, XP002994468
NISHIDA H. ET AL: "Nannenka Poly Nyusan Soseibutsu no Chemical Recycle. (3X03)", POLYMER PREPRINTS., vol. 53, no. 2, 1 September 2004 (2004-09-01), pages 5591, XP002994469
NISHIDA H. ET AL: "Nannenka Poly Nyusan Soseibutsu no Chemical Recycle. (2PA26)", POLYMER ZAIRYO FORUM KOEN YOKOSHU., vol. 13, 28 October 2004 (2004-10-28), pages 145, XP002994470
See also references of EP 1741707A4
SHIROI Y. ET AL: "Poly Nyusan no Chemical Recycle to Junkan Shankai System.", vol. 51, no. 3, 2003, pages 27 - 29, XP002994467
CAM D. ET AL: "Influence of residual monomers and metals on poly (L-lactide) thermal stability.", POLYMER., vol. 38, no. 8, 1997, pages 1879 - 1884, XP000685196
NODA M. ET AL: "Thermal catalytic depolymerization of poly (l-lactic acid) oligomer into l,l-lactide: Effects of Al, Ti, Zn, and Zr compounds as catalysis.", CHEM PHARM BULL., vol. 47, no. 4, 1999, pages 467 - 471, XP002989188
DEGEE P. ET AL: "Bulk polymerization of lactides initiated by aluminium isopropoxide, 3 a) Thermal stability and viscoelastic properties.", MACROMOL CHEM PHYS., vol. 198, no. 6, 1997, pages 1985 - 1995, XP000696488
FAN Y. ET AL: "Effect of Aluminum Compounds on Thermal Degradation of Poly Lactic Acid (IK10)", POLYMER PREPRINTS., vol. 53, no. 1, 10 May 2004 (2004-05-10), pages 2204, XP002994468
NISHIDA H. ET AL: "Nannenka Poly Nyusan Soseibutsu no Chemical Recycle. (3X03)", POLYMER PREPRINTS., vol. 53, no. 2, 1 September 2004 (2004-09-01), pages 5591, XP002994469
NISHIDA H. ET AL: "Nannenka Poly Nyusan Soseibutsu no Chemical Recycle. (2PA26)", POLYMER ZAIRYO FORUM KOEN YOKOSHU., vol. 13, 28 October 2004 (2004-10-28), pages 145, XP002994470
See also references of EP 1741707A4
Attorney, Agent or Firm:
Noguchi, Yasuhiro (18-1 Toranomon 1-chom, Minato-ku Tokyo, JP)
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