The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 2006
Filed:
Jan. 27, 2005
Thomas Link Guggenheim, Mt. Vernon, IN (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Ganesh Kailasam, Evansville, IN (US);
Pradeep Nadkarni, Bangalore, IN;
David Winfield Woodruff, Saratoga Springs, NY (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Ganesh Kailasam, Evansville, IN (US);
Pradeep Nadkarni, Bangalore, IN;
David Winfield Woodruff, Saratoga Springs, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method of making a polyether polymer comprises reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I)Z(A—X)  (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, Ais an aromatic radical and Xis fluoro, chloro, bromo or nitro; determining the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon needed to form a final polyether polymer with a predetermined molecular weight and adding the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon to the intermediate polymer.