Process for the preparation of activated polythylene glycols

Details Process for the preparation of activated polythylene glycols Process for the preparation of activated polythylene glycols

2008-02-04

2010-02-16

Anderson, Rebecca L (Department: 1626)

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

Synthetic resins

From carboxylic acid or derivative thereof

Reexamination Certificate

active

07662908

ABSTRACT:
A process for preparing activated polyethylene glycols is disclosed. In some embodiments, the process includes reacting a molten polyethylene glycol with an activator. In other embodiments, the process includes reacting a polyethylene glycol with an activator in the absence of a solvent. The process may be carried out in an inert gas atmosphere, at a temperature at least 10° C. above the melting point of polyethylene glycol, and/or with the activator provided in molar excess of the polyethylene glycol. The invention further provides activated polyethylene glycols produced by this process and their use in a variety of pharmaceutical, medical, cosmetic and chemical applications.

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