Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-05-10
2005-05-10
Dentz, Bernard (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C562S579000
Reexamination Certificate
active
06891048
ABSTRACT:
The invention provides a process for producing glycolide by depolymerization by heating of a glycolic acid oligomer in the presence or absence of a solvent, which process ensures stable depolymerization. The depolymerization reaction is carried out while the content of alkaline metal ions in a glycolic acid oligomer-containing depolymerization reaction system is controlled to 0.001% by mass or lower; a sulfate or an organic acid salt, each in the form of di- or poly-valent cations, or a mixture thereof is allowed to be present as a stabilizer in the depolymerization reaction system; or the content of alkaline metal ions in the depolymerization reaction system is controlled to 0.001% by mass or lower, and a sulfate or an organic acid salt, each in the form of di- or poly-valent cations, or a mixture thereof is allowed to be present as a stabilizer in the depolymerization reaction system.
REFERENCES:
patent: 2668162 (1954-02-01), Lowe
patent: 4727163 (1988-02-01), Bellis
patent: 4835293 (1989-05-01), Bhatia
patent: 5023349 (1991-06-01), Bhatia
patent: 5830991 (1998-11-01), Shiiki et al.
patent: 2692263 (1993-12-01), None
Kawakami Yukichika
Yamane Kazuyuki
Dentz Bernard
Dinsmore & Shohl LLP
Kureha Kagaku Kogyo KK
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