Patent ID: 8097692
Filing Date: 2012-01-17
Classification: C08G,C08L

Abstract:
1. A purification method of polyoxyalkylene derivative, wherein an impurity is separated from a polyoxyalkylene derivative having a molecular weight of 8,800 to 100,000 represented by the following general formula [1], the impurity being different from the polyoxyalkylene derivative in the number of hydroxyl groups, the method comprising the following steps (A), (B), (C), and (D): step (A): a step in which an aprotic organic solvent is used in an amount at least 5 times by weight the amount of the polyoxyalkylene derivative to dissolve the polyoxyalkylene derivative to give a solution of the polyoxyalkylene derivative; step (B): a step in which an inorganic adsorbent comprising an oxide containing at least one of aluminum and silicon is added to the solution in an amount 0.5 to 5 times by weight the amount of the polyoxyalkylene derivative to produce a slurry; step (C): a step in which the slurry is stirred at 25° C. or higher; and step (D): a step in which the polyoxyalkylene derivative is recovered from the slurry: wherein Z is a residue of a compound having 2 to 8 active hydrogen atoms; Y Polymer R represents a hydrocarbon group having 1 to 7 carbon atoms or an acetal group having 3 to 9 carbon atoms; X represents an amino group, a protected amino group, a protected carboxyl group, an aldehyde group, a protected aldehyde group, a hydroxyl group, a protected hydroxyl group, a thiol group, a protected thiol group, a sulfonyl group, a vinyl group, an allyl group, a cyano group, or an alkylene group containing any of these, or a hydrogen atom; m and n are such that m=1 or 0, n=1 or 0, and 1≦m+n; a and b are integers satisfying 0≦a≦8, 0≦b≦8, and 2≦a+b≦8; and when a and b are integers of 2 or larger, Y