Patent ID: 7125954

Claim:
A method of making a polyether polymer comprising reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) Z(A 1 —X 1 ) 2 (I) in the presence of a catalyst to form an intermediate polymer having endgroups, wherein the molar ratio of the salt of a dihydroxy-substituted aromatic hydrocarbon to the substituted aromatic compound is less than 1, Z is an activating radical, A 1 is an aromatic radical and X 1 is fluoro, chloro, bromo or nitro; determining the gram moles of endgroups per gram of polymer present on the intermediate polymer; reacting the intermediate polymer with an additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon to form a final polymer having endgroups and a predetermined molecular weight wherein the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon equals grams of final polymer X (gram moles of end groups per gram of polymer for the intermediate polymer - gram moles of end groups per gram of polymer for the final polymer)/2.