Polyethylene glycol and process for producing the same

摘要

Polyethylene glycol for use in fields with application to a living body wherein the sum of the contents of ethylene glycol and diethylene glycol in the polyethylene glycol is less than or equal to that expressed in the following formula [I]: 1 $\begin{array}{cc}\mathrm{Sum}\mathrm{of}\mathrm{ethylene}\mathrm{glycol}\mathrm{and}\mathrm{diethylene}\mathrm{glycol}\mathrm{contents}\left(\mathrm{ppm}\right)=\frac{150x2900x{0.85}^{\left(x-150\right)/44}}{x}& \left[I\right]\end{array}$ wherein x represents the average molecular weight of the polyethylene glycol, and the polyethylene glycol has an average molecular weight ranging from 190 to 1,050.