Method of preparing polyalkylene oxide carboxylic acids
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United States of America Patent
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Oct 28, 1997
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N/A
app pub date -
Aug 13, 1996
filing date -
May 15, 1995
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Abstract
The present invention is directed to methods of preparing high purity polyalkylene oxide carboxylic acids. The methods include reacting a polyalkylene oxide such as polyethylene glycol with a t-butyl haloacetate in the presence of a base followed by treatment with an acid such as trifluoroacetic acid. The resultant polymer carboxylic acids are of sufficient purity so that expensive and time containing purification steps required for pharmaceutical grade polymers are avoided.
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