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:
May. 11, 2010
Filed:
Feb. 28, 2006
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Havva Yagci Acar, Istanbul, TR;
Farid Fouad Khouri, Clifton Park, NY (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
David Winfield Woodruff, Saratoga Springs, NY (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Havva Yagci Acar, Istanbul, TR;
Farid Fouad Khouri, Clifton Park, NY (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
David Winfield Woodruff, Saratoga Springs, NY (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Abstract
Polyether polymers, such as polyetherimides, are prepared by the reaction of a dihydroxy-substituted aromatic hydrocarbon alkali metal salt, such as bisphenol A disodium salt, with a bis(N-(chlorophthalimido))aromatic compound, such as 1,3- and/or 1,4-bis(N-(4-chlorophthalimido))benzene, in a solvent such as o-dichlorobenzene and in the presence of a phase transfer catalyst such as a hexaalkylguanidinium chloride. Several embodiments may be employed to improve the method. They comprise employing substantially dry reagents, employing a high solids level in solvent, beginning with an excess of bis(N-(chlorophthalimido))-aromatic compound and incrementally adding alkali metal salt, employing alkali metal salt of small particle size, and using reagents of high purity.