Patent ID: 6570041
Filing Date: 2003-05-27
Classification: C08G

Abstract:
A polyoxytetramethylene glycol (PTMG) having the following characteristics:(1) a number average molecular weight of from 500 to 3000; (2) a molecular weight distribution of 1.8 or less in terms of the Mw/Mn ratio, wherein Mw represents the weight average molecular weight of PTMG and Mn represents the number average molecular weight of PTMG; (3) a content of high molecular weight PTMG molecules of from 2 to 5% by weight, based on the total weight of all PTMG molecules, wherein said high molecular weight PTMG molecules are defined as PTMG molecules having molecular weights which are at least six times as large as the number average molecular weight of all PTMG molecules; and (4) a heteropolyacid content of from 10 to 900 ppb by weight.