Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-11-25
2008-10-14
Price, Elvis O (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S606000, C568S613000
Reexamination Certificate
active
07435857
ABSTRACT:
The invention relates to a method for producing pure alpha-alkoxy-Ω-hydroxy-polyalkylene glycols, creating small impurities of the product on high-molecular a-Ω-di-hydroxy-polyalkylene glycols. The method is based on the use of high-boiling initiator alcohols of the following general structure R2—(OCH2CHR)k—OH wherein R2represents an alkyl radical comprising between 1 and 4 C atoms, preferably R2═CH3, k represents a number between 1 and 10, preferably between 1 and 4, and R represents H, CH3or an alkyl radical comprising between 2 and 4 C atoms, preferably R═H, CH3. The use of the cited initiator alcohols enables the mixture of a basic catalyst and an initiator alcohol to be dried in such a way that it has a very low water content, and thus to produce very low concentrations of unwanted a-Ω-di-hydroxy-polyalkylene glycol impurities.
REFERENCES:
patent: 5661020 (1997-08-01), Snow
patent: 6166112 (2000-12-01), Hirata
patent: 2003/0073873 (2003-04-01), Brons
patent: 3121929 (1997-08-01), None
patent: 0884290 (1998-12-01), None
patent: 1295902 (2003-03-01), None
patent: 00012577 (2000-03-01), None
English Lang. Translation of IPER for PCT/EP2005/012622, mailed 2007-06013.
English language Abstract for DE3121929, Feb. 24, 1983.
Harris, JM, “Introduction to Biotechnical and Biomedical Applications of Poly(Ethylene Glycol)”, Plenum Press(New York), (1992).
Voronese et al., “Preparation and Properties of Monomethoxypoly(Ethylene Glycol)-Modified Enzymes”, Polyethylene Glycol Chemistry, ed. J. Milton Harris, Plenum Press, (New York), (1992).
Selisko, B., et al., “Analysis and Purification of Monomethoxy-Polyethylene Glycol by Vesicle and Gel Permeation Chromatography”, Jour. of Chromatography, No. 641, (1993), p. 71-79.
Encyclopedia of Polymer Science and Eng., Wiley & Sons, vol. 2, p. 1 (1986).
Copending Application—U.S. Appl. No. 11/975,467, filed Oct. 19, 2007.
International Search Report PCT/EP2005/012622, mailed Apr. 18, 2006.
English Language Abstract of JP6248070 A, Sep. 6, 1994.
Poellmann Klaus
Strasser Anton
Vybiral Reinhard
Wagner Rainer
Clariant Produkte ( Deutschland) GmbH
Price Elvis O
Silverman Richard P.
LandOfFree
Method for producing pure... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for producing pure..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing pure... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4006999