CA2173616A1 - Continuous process for the manufacture of lactide and lactide polymers - Google Patents

Continuous process for the manufacture of lactide and lactide polymers

Info

Publication number
CA2173616A1
CA2173616A1 CA002173616A CA2173616A CA2173616A1 CA 2173616 A1 CA2173616 A1 CA 2173616A1 CA 002173616 A CA002173616 A CA 002173616A CA 2173616 A CA2173616 A CA 2173616A CA 2173616 A1 CA2173616 A1 CA 2173616A1
Authority
CA
Canada
Prior art keywords
lactide
polymers
crude
manufacture
lactic acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002173616A
Other languages
French (fr)
Other versions
CA2173616C (en
Inventor
Patrick Richard Gruber
Eric Stanley Hall
Jeffrey John Kolstad
Matthew Lee Iwen
Richard Douglas Benson
Ronald Leo Borchardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cargill Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2173616A1 publication Critical patent/CA2173616A1/en
Application granted granted Critical
Publication of CA2173616C publication Critical patent/CA2173616C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
    • C08G63/08—Lactones or lactides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D319/00—Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms
    • C07D319/10—1,4-Dioxanes; Hydrogenated 1,4-dioxanes
    • C07D319/12—1,4-Dioxanes; Hydrogenated 1,4-dioxanes not condensed with other rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids

Abstract

A process for the continuous production of substantially purified lactide and lactide polymers from lactic acid or an ester of lactic acid including the steps of forming crude polylactic acid, preferably in the presence of a catalyst means in the case of the ester of lactic acid, to form a condensation reaction by-product and polylactic acid, and depolymerizing the polylactic acid in a lactide reactor to form crude lactide, followed by subsequent purification of the crude lactide in a distillation system. A purified lactide is then polymerized to form lactide polymers.
CA002173616A 1993-10-07 1994-10-04 Continuous process for the manufacture of lactide and lactide polymers Expired - Lifetime CA2173616C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/133,445 1993-10-07
US08/133,445 US6326458B1 (en) 1992-01-24 1993-10-07 Continuous process for the manufacture of lactide and lactide polymers
PCT/US1994/011245 WO1995009879A1 (en) 1993-10-07 1994-10-04 Continuous process for the manufacture of lactide and lactide polymers

Publications (2)

Publication Number Publication Date
CA2173616A1 true CA2173616A1 (en) 1995-04-13
CA2173616C CA2173616C (en) 2006-08-29

Family

ID=22458660

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002173616A Expired - Lifetime CA2173616C (en) 1993-10-07 1994-10-04 Continuous process for the manufacture of lactide and lactide polymers

Country Status (5)

Country Link
US (1) US6326458B1 (en)
EP (2) EP0722469A1 (en)
AU (1) AU7965194A (en)
CA (1) CA2173616C (en)
WO (1) WO1995009879A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2023222042A1 (en) * 2022-05-18 2023-11-23 中国石油大学(华东) Manufacturing method for high-molecular-weight polylactic acid

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US6326458B1 (en) 2001-12-04
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