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:
Nov. 26, 2013
Filed:
Dec. 22, 2004
John Yupeng Gui, Niskayuna, NY (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
David Winfield Woodruff, Saratoga Springs, NY (US);
James Manio Silva, Clifton Park, NY (US);
Farid Fouad Khouri, Clifton Park, NY (US);
John Yupeng Gui, Niskayuna, NY (US);
Norman Enoch Johnson, Mt. Vernon, IN (US);
Thomas Link Guggenheim, Mt. Vernon, IN (US);
David Winfield Woodruff, Saratoga Springs, NY (US);
James Manio Silva, Clifton Park, NY (US);
Farid Fouad Khouri, Clifton Park, NY (US);
Abstract
Bis(halophthalimides) are prepared in mixture in an organic liquid such as ortho-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamine compound and at least one halophthalic anhydride in the presence of imidization catalyst. The reaction mixture is maintained at about 15% by weight solids content and rich in the halophthalic anhydride by constantly monitoring the reaction mixture using analytical methods such as high performance liquid chromatography. The product mixture may be directly employed in the direct preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.