Method of preparing polyalkylene oxide carboxylic acids

Details Method of preparing polyalkylene oxide carboxylic acids Method of preparing polyalkylene oxide carboxylic acids

1995-05-15

1997-02-25

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525409, 528300, 528302, 528361, C08G 6532

Patent

active

056059760

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 consuming purification steps required for pharmaceutical grade polymers are avoided.

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