Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-05-11
2000-11-07
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528357, 528361, 528281, 525413, 525415, 606230, 428486, C08G 6308
Patent
active
061438634
ABSTRACT:
A lactide polymer composition combining compositional and purity limitations and catalyst optimization or addition of stabilizing agents resulting in a melt-stable polymer is disclosed. The melt-stable lactide polymer comprises a plurality of polylactide polymer chains, residual lactide in concentration of less than 2 percent and water in concentration of less than 1000 parts-per-million. A stabilizing agent in an amount sufficient to reduce depolymerization of the lactide polymer during melt-processing or alternatively, control of catalyst level at a molar ratio of monomer to catalyst greater than 3000:1 is also included in the melt-stable composition. A process for manufacture of a melt-stable lactide polymer composition includes polymerizing a lactide mixture and adding stabilizing agents sufficient to reduce depolymerization of the polylactide during melt-processing, followed by devolatilizing the polylactide to remove monomer and water.
REFERENCES:
patent: 1095205 (1914-05-01), Gruter et al.
patent: 1849107 (1932-03-01), Moss
patent: 1995970 (1935-04-01), Dorough
patent: 2396994 (1946-03-01), Filachione et al.
patent: 2703316 (1955-03-01), Schneider
patent: 2758987 (1956-08-01), Salzberg
patent: 2951828 (1960-09-01), Zeile et al.
patent: 3268487 (1966-08-01), Klootwijik
patent: 3332791 (1967-07-01), Selman
patent: 3531561 (1970-09-01), Trehu
patent: 3636956 (1972-01-01), Schneider
patent: 3772420 (1973-11-01), Glick et al.
patent: 3773919 (1973-11-01), Boswell et al.
patent: 3839297 (1974-10-01), Wassermann et al.
patent: 3887699 (1975-06-01), Yolles
patent: 4045418 (1977-08-01), Sinclair
patent: 4273920 (1981-06-01), Nevin
patent: 4279249 (1981-07-01), Vert et al.
patent: 4595713 (1986-06-01), St. John
patent: 4643734 (1987-02-01), Lin
patent: 4677191 (1987-06-01), Tanaka et al.
patent: 4683288 (1987-07-01), Tanaka et al.
patent: 4719246 (1988-01-01), Murdoch et al.
patent: 4727163 (1988-02-01), Bellis
patent: 4728721 (1988-03-01), Yamamoto et al.
patent: 4766182 (1988-08-01), Murdoch et al.
patent: 4789726 (1988-12-01), Hutchinson
patent: 4797468 (1989-01-01), DeVries
patent: 4800219 (1989-01-01), Murdoch et al.
patent: 4835293 (1989-05-01), Bhatia
patent: 4902515 (1990-02-01), Loomis et al.
patent: 4950258 (1990-08-01), Kawai et al.
patent: 4960866 (1990-10-01), Bendix et al.
patent: 4981696 (1991-01-01), Loomis et al.
patent: 4983745 (1991-01-01), Muller et al.
patent: 5023349 (1991-06-01), Bhatia
patent: 5023350 (1991-06-01), Bhatia
patent: 5041529 (1991-08-01), Shinoda et al.
patent: 5043458 (1991-08-01), Bhatia
patent: 5053485 (1991-10-01), Nieuwenhuis et al.
patent: 5053522 (1991-10-01), Muller
patent: 5076983 (1991-12-01), Loomis et al.
patent: 5108399 (1992-04-01), Eitenmuller et al.
patent: 5124023 (1992-06-01), Gruber et al.
patent: 5132397 (1992-07-01), DeGuia
patent: 5136017 (1992-08-01), Kharas et al.
patent: 5252646 (1993-10-01), Iovine et al.
patent: 5302694 (1994-04-01), Buchholz
patent: 5338822 (1994-08-01), Gruber et al.
patent: 5539081 (1996-07-01), Gruber et al.
patent: 5763564 (1998-06-01), Gruber et al.
M. Vert and F. Chabot, Stereoregular Bioresorbable Polyesters for Orthopaedic Surgery, Makromol. Chem., Supp. 5, pp. 30-41 (1981).
M. Gupta and V. Deshmukh, Thermal Oxidative Degradation of Poly-lactic Acid; Part I: Activation Energy of Thermal Degradation in Air, Colloid & Polymer Science 260:308-311 (1982).
M. Gupta and V. Deshmukh, Thermal Oxidative Degradation of Poly-lactic Acid; Part II: Molecular Weight and Electronic Spectra During Isothermal Heating, Colloid & Polymer Science 260:514-417 (1982).
H. Kricheldorf and A. Serra, Polylactones 6. Influence of Various Metal Salts on the Optical Purity of Poly(L-lactide), Polymer Bulletin 14:497-502 (1985).
A. Chawla and T. Chang, In-Vivo Degradation of Poly(lactic acid) of Different Molecular Weights, Biomat., Med. Dev., Art. Org., 13:153-162 (1985).
I. McNeill and H. Leiper, Degradation Studies of Some Polyesters and Polycarbonates--1. Polylactide: General Features of the Degradation Under Programmed Heating Conditions, Polymer Degradation and Stability 11:267-285 (1985).
I. McNeill and H. Leiper, Degradation Studies of Some Polyesters and Polycarbonates--2. Polylactide: Degradation Under Isothermal Conditions, Thermal Degradation Mechanism and Photolysis of the Polymer, Polymer Degradation and Stability 11:309-326 (1985).
Makino et al., Preparation and in Vitro Degradation Properties of Polylactide Microcapsules, Chem. Pharm. Bull. 33:1195-1201 (1985).
D. Garozzo et al., Primary Thermal Decomposition Processes in Aliphatic Polyesters Investigated by Chemical Ionization Mass Spectrometry, Macromolecules 19:1643-1649 (1986).
Irganox.RTM. 1076 Antioxidant and Thermal Stabilizier, (published on an unknown date in 1986 by Ciba-Geigy Corporation, Three Skyline Drive, Hawthorne, NY 10532).
Nakamura et al., Surgical Application of Biodegradable Films Prepared from Lactide-.epsilon.-Caprolactone Copolymers, Bio. Materials and Clinical Applications 7:759-764 (1987).
H. Kricheldorf et al., Polymerization Mechanism of Metal Alkoxide Initiated Polymerizations of Lactide and Various Lactones, Makromol. 21:286-293 (1988).
K. Jamshidi et al., Thermal Characterization of Polylactides, Polymer 29:2229-2234 (1988).
M. Vert, Bioresorbable Polymers for Temporary Therapeutic Applications, Die Angwandte Makromolekulare Chemie 166-167:155-158 (1989).
Hydrolytic Stability/Corrosivitiy of Phosphite Costabilizers, (Technical Bulletin 89-04, published on an unknown date in 1989, by Stars Laboratory, Additives Division, Ciba-Geigy Corporation, Ardsley, NY 10502).
GE Specialty Chemicals Product Guide CA-4001E, (published on an unknown date in 1989, by General Electric Company, 5th and Avery Street, Parkersburg, WV 26102).
Tinuvin.RTM. 123 Hindered Aminoether Light Stabilizer for Coatings, (published on an unknown date in 1989, by Ciba-Geigy Corporation, Three Skyline Drive, Hawthorne, NY 10523).
Irganox.RTM. B-Blends Antioxidants and Process Stabilizers for Polymers, (published on an unknown date in Mar., 1990 by Ciba-Geigy Corporation, Three Skyline Drive, Hawthorne, NY 10523).
Naugard.RTM. 445, Specialty Chemicals, (a product brochure published on or before May 1, 1990, by Uniroyal Chemical Company, Inc., Middlebury, CT 06749).
Ethanox.RTM. 398 Antioxidant, The First Fluorophosphonite Antioxidant, (published on or before an unknown date in Oct., 1990, by Ethyl Corporation, 451 Florida Blvd., Baton Rouge, LA 70801).
The Resomer.RTM. Resorbable Polyesters, (published on or before an unknown date in Feb., 1991 by Boehringer Ingelheim KG, D-6507 Ingelheim, W. Germany).
P. Klemchuk, Introduction to Polymer Degradation, lecture notes distributed at a seminar entitled Principles of Polymer Degradation and Stabilization in Orlando, Florida, Oct. 28-30, 1991, sponsored by The Institute of Materials Science, State University of New York and New Paltz.
R. Thomas, Degradation and Stabilization of Engineering Polymers, lecture notes distributed at a seminar entitled: Principles of Polymer Degradation and Stabilization in Orlando, Florida, Oct. 28-30, 1991, sponsored by the Institute of Materials Science, State University of New York at New Paltz.
W. Enlow, Process Stabilization with Phosphite Antioxidants, lecture notes distributed at a seminar entitled: Principles of Polymer Degradation and Stabilization in Orlando, Florida, Oct. 28-30, 1991, sponsored by The Institute of Materials Science, State University of New York at New Paltz.
Naugard.RTM. XL-1 Specialty Chemicals, (product brochure published on an unknown date in Feb., 1992, by Uniroyal Chemical Co., Inc., Middlebury, CT 06749).
Sir John Meurig Thomas, Solid Acid Catalysts, Scientific American, pp. 112-118 (Apr. 1992).
Argus Product Data, Argus.RTM. Dimyristyl Thiodipropionate, (published on or before an unknown date in Aug. 1992 by Argus Division, Witco Corporation, 633 Court Street, Brooklyn, NY 11231-2193).
Argus Thiochemical Product Data, Argus.RTM. Thiodipropionate, (published on or before an unknown date in Aug., 1992, by Argus Division, Witco Corporation, 633 Court Stree
Eichen Conn Robin Sue
Gruber Patrick Richard
Hall Eric Stanley
Kolstad Jeffrey John
Ryan Christopher M.
Cargill Incorporated
Truong Duc
LandOfFree
Melt-stable lactide polymer composition and process for manufact does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Melt-stable lactide polymer composition and process for manufact, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Melt-stable lactide polymer composition and process for manufact will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1642350