Continuous process for the manufacture of a purified lactide from esters of lactic acid United States Patent 05247059

05247059 is referenced by 167 patents and cites 88 patents.

A process for the continuous production of substantially purified lactide and lactide polymers from an ester of lactic acid including the steps of forming crude lactide in the presence of a catalyst means to form a condensation reaction by-product and polylactic acid and depolymerizing the polylactic acid molecules followed by subsequent purification of the crude lactide in a distillation system. A purified lactide is then polymerized.

Title
Continuous process for the manufacture of a purified lactide from esters of lactic acid
Application Number
825059
Publication Number
5247059
Application Date
August 24, 1992
Publication Date
September 21, 1993
Inventor
Ronald L Borchardt
Eden Prairie
MN, US
Richard D Benson
Long Lake
MN, US
Matthew L Iwen
Minneapolis
MN, US
Jeffrey J Kolstad
Wayzata
MN, US
Eric S Hall
Crystal
MN, US
Patrick R Gruber
St. Paul
MN, US
Agent
Merchant Gould Smith Edell Welter & Schmidt
Assignee
Cargill Incorporated
MN, US
IPC
C07D 319/12
C08G 63/08
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Citations: 167 (view full list)

  1. Ali Zakareya El Afandi, Patrick Richard Gruber, Jeffrey John Kolstad, James Lunt, Christopher M Ryan, James Zakareya Nangeroni, Nancy Uzelac Buehler, Mark Hartmann, Jed Richard Randall, Andrea Lee Brosch: Compostable multilayer structures, methods for manufacture, and articles prepared therefrom. Cargill Incorporated, Merchant Gould Smith Edell Welter & Schmidt P A, December 15, 1998: US05849401 (196 worldwide citation)
  2. Patrick R Gruber, Jeffrey J Kolstad, David R Witzke, Mark H Hartmann, Andrea L Brosch: Viscosity-modified lactide polymer composition and process for manufacture thereof. Cargill Incorporated, Merchant Gould Smith Edell Welter & Schmidt P A, January 14, 1997: US05594095 (164 worldwide citation)
  3. Philip D Nguyen, Bradley L Todd, Trinidad Munoz Jr: Compositions and methods for improving proppant pack permeability and fracture conductivity in a subterranean well. Halliburton Energy Services, Robert A Kent, Baker Botts, May 16, 2006: US07044220 (125 worldwide citation)
  4. Donald Justus, Bradley L Todd, Philip D Nguyen: Reduced-density proppants and methods of using reduced-density proppants to enhance their transport in well bores and fractures. Halliburton Energy Services, Robert A Kent, Baker Botts, June 27, 2006: US07066258 (115 worldwide citation)
  5. Matthew E Blauch, Philip D Nguyen, Thomas D Welton: Methods for improving proppant pack permeability and fracture conductivity in a subterranean well. Halliburton Energy Services, Robert A Kent, Baker Botts, February 20, 2007: US07178596 (108 worldwide citation)
  6. Craig W Roddy, Bradley L Todd: Contained micro-particles for use in well bore operations. Halliburton Energy Services, Craig W Roddy, Fletcher Yoder, January 2, 2007: US07156174 (98 worldwide citation)
  7. Loyd E East Jr, Travis W Cavender, David J Attaway: Methods of stimulating a subterranean formation comprising multiple production intervals. Halliburton Energy Services, Robert A Kent, Fletcher Yoder & Van Someren, September 25, 2007: US07273099 (96 worldwide citation)
  8. Trinidad Munoz Jr, Bradley L Todd: Methods of diverting treating fluids in subterranean zones and degradable diverting materials. Halliburton Energy Services, Robert A Kent, Baker Botts, May 2, 2006: US07036587 (95 worldwide citation)
  9. Philip D Nguyen, Thomas D Welton, Billy F Slabaugh, Matthew E Blauch, Mark A Parker, Jimmie D Weaver, Bobby K Bowles: Methods using particulates coated with treatment chemical partitioning agents. Halliburton Energy Services, Robert A Kent, Baker Botts, August 28, 2007: US07261156 (94 worldwide citation)
  10. Philip D Nguyen, Thomas D Welton, Billy F Slabaugh, Matthew E Blauch, Mark A Parker, Jimmie D Weaver, Bobby K Bowles: Methods of using partitioned, coated particulates. Halliburton Energy Services, Robert A Kent, Baker Botts, September 4, 2007: US07264051 (89 worldwide citation)

References: 88 (view full list)

  1. Tatsuya Kawai, Takashi Matsuda: Plastic molded articles with shape memory property. Japan Medical Supply, Kramer Brufsky & Cifelli, August 21, 1990: US04950258 (365 worldwide citation)
  2. Schneider Allan K: Polylactide sutures. Ethicon, January 25, 1972: US3636956 (350 worldwide citation)
  3. Jurgen Eitenmuller, Heinz Offergeld, Walter Michaeli: Device for osteosynthesis and process for producing it. Boehringer Ingelheim, Daniel Reitenbach, David E Frankhouser, Mary Ellen M Timbers, April 28, 1992: US05108399 (277 worldwide citation)
  4. Yolles Seymour: Biodegradable polymeric article for dispensing drugs. June 3, 1975: US3887699 (257 worldwide citation)
  5. Casey Donald James, Epstein Martin: Process for polymerizing a substantially pure glycolide composition. American Cyanamid Company, Dunn James T, October 14, 1975: US3912692 (222 worldwide citation)
  6. Patrick R Gruber, Eric S Hall, Jeffrey J Kolstad, Matthew L Iwen, Richard D Benson, Ronald L Borchardt: Continuous process for manufacture of lactide polymers with controlled optical purity. Cargill Incorporated, Merchant Gould Smith Edell Welter & Schmidt, August 25, 1992: US05142023 (214 worldwide citation)
  7. Kenneth St John: Medical putty for tissue augmentation. Hexcel Corporation, Oblon Fisher Spivak McClelland & Maier, June 17, 1986: US04595713 (187 worldwide citation)
  8. Kent John Scott, Sanders Lynda Mary, Lewis Danny Harvey, Tice Thomas Robert: Microencapsulation of water soluble polypeptides.. Syntex, May 26, 1982: EP0052510-A2 (168 worldwide citation)
  9. Wasserman David, Versfelt Charles Curtis: Use of stannous octoate catalyst in the manufacture of l(-)lactide-glycolide copolymer sutures. Ethicon, Kell Robert W, October 1, 1974: US3839297 (167 worldwide citation)
  10. Michel Vert, Francois Chabot, Jean Leray, Pascal Christel: New prosthesis parts, their preparation and their application. Agence Nationale de Valorisation de la Recherche, Institut National de la Sante et de la Recherche Medicale, Cushman Darby & Cushman, July 21, 1981: US04279249 (141 worldwide citation)