Claims
- 1. A process for enzymatic hydrolysis of cyclic oligomers of poly(ethylene terephthalate), which process comprises subjecting the cyclic oligomer to the action of one or more carboxylic ester hydrolases.
- 2. The process according to claim 1, which process comprises subjecting the cyclic oligomer to the action of one or more lipolytic and/or biopolyester hydrolytic enzyme(s).
- 3. The process according to claim 2, wherein the lipolytic enzyme is a lipase, an esterase, a phospholipase, and/or a lyso-phospholipase.
- 4. The process according to claim 3, wherein the lipolytic enzyme is a lipase derived from a strain of Aspergillus, a strain of Achromobacter, a strain of Bacillus, a strain of Candida, a strain of Chromobacter, a strain of Fusarium, a strain of Humicola, a strain of Hyphozyma, a strain of Pseudomonas, a strain of Rhizomucor, a strain of Rhizopus, or a strain of Thermomyces.
- 5. The process according to claim 4, wherein the lipolytic enzyme is a lipase derived from a strain of Bacillus pumilus, a strain of Bacillus stearothermophilus a strain of Candida cylindracea, a strain of Candida antarctica, a strain of Humicola insolens, a strain of Hyphozyma, a strain of Pseudomonas cepacia, or a strain of Thermomyces lanuginosus.
- 6. The process according to claim 2, wherein the lipolytic enzyme is a phospholipase or lyso-phospholipase derived from a strain of Achromobacter, in particular a Achromobacter iophagus, a strain of Candida, in particular Candida paralipolytica, a strain of Pseudomonas, in particular Pseudomonas mephitica lipolytica.
- 7. The process according to claim 2, wherein the biopolyester hydrolytic enzyme is an esterase and/or poly-hydroxyalkanoate depolymerase.
- 8. The process according to claim 7, wherein the esterase is a cutinase, or a suberinase.
- 9. The process according to claim 7, wherein the esterase is derived from a strain of Aspergillus, in particular Aspergillus oryzae, a strain of Alternaria, in particular Alternaria brassiciola, a strain of Fusarium, in particular Fusarium solani, Fusarium solani pisi, Fusarium roseum culmorum, or Fusarium roseum sambucium, a strain of Helminthosporum, in particular Helminthosporum sativum, a strain of Humicola, in particular Humicola insolens, a strain of Pseudomonas, in particular Pseudomonas mendocina, or Pseudomonas putida, a strain of Rhizoctonia, in particular Rhizoctonia solani, a strain of Streptomyces, in particular Streptomyces scabies, or a strain of Ulocladium, in particular Ulocladium consortiale.
- 10. The process according to claim 9, wherein the esterase is a cutinase derived from a strain of Humicola insolens, in particular the strain Humicola insolens DSM 1800.
- 11. The process according to claim 7, wherein the poly-hydroxyalkanoate depolymerase is derived from a strain of Alcaligenes, in particular Alcaligenes faecalis, a strain of Bacillus, in particular Bacillus megaterium, a strain of Camomonas, in particular Camomonas testosteroni, a strain of Penicillium, in particular Penicillium funiculosum, a strain of Pseudomonas, in particular Pseudomonas fluorescens, Pseudomonas lemoignei and Pseudomonas oleovorans, or a strain of Rhodospirillum, in particular Thodospirillum rubrum.
- 12. The process according to any of claims 1-11, further comprising the addition of one or more chemicals improving the enzyme-substrate interaction, in particular a surfactants, a wetting agent, and/or a dispersing agent.
- 13. The process according to any of claims 1-12, wherein the enzymatic action is followed by a rinsing step, during which step hydrolyzed cyclic oligomer is subjected to treatment with an alkaline solution.
- 14. The process according to either of claims 1-13, wherein the cyclic oligomer is present in and on the fibers of a polyester containing fabric or yarn.
- 15. The process according to either of claims 1-14, in which the cyclic oligomer is cyclic tri(ethylene terephthalate).
Priority Claims (1)
Number |
Date |
Country |
Kind |
0066/96 |
Jan 1996 |
DK |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent application Ser. No. 09/677,232, filed on Oct. 2, 2000, (now allowed), which is a continuation of U.S. patent application Ser. No. 09/119,892, filed on Jul. 21, 1998, (now a U.S. Pat. No. 6,184,010), which is a continuation of PCT/DK97/00025 filed on Jan. 20, 1997, which claims priority under 35 U.S.C. 119 of Danish application no. 0066/96, filed on Jan. 22, 1996, the contents of which are fully incorporated herein by reference.
Continuations (3)
|
Number |
Date |
Country |
Parent |
09677232 |
Oct 2000 |
US |
Child |
10373510 |
Feb 2003 |
US |
Parent |
09119892 |
Jul 1998 |
US |
Child |
09677232 |
Oct 2000 |
US |
Parent |
PCT/DK97/00025 |
Jan 1997 |
US |
Child |
09119892 |
Jul 1998 |
US |