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. 02, 2007
Filed:
Mar. 31, 2004
Veeraraghavan Srinivasan, Bangalore, IN;
Suresh Shanmugam, Bangalore, IN;
Gautam Chatterjee, Bangalore, IN;
Anantharaman Dhanabalan, Bangalore, IN;
Vinod Kumar Rai, Bangalore, IN;
Veeraraghavan Srinivasan, Bangalore, IN;
Suresh Shanmugam, Bangalore, IN;
Gautam Chatterjee, Bangalore, IN;
Anantharaman Dhanabalan, Bangalore, IN;
Vinod Kumar Rai, Bangalore, IN;
General Electric Company, Schenectady, NY (US);
Abstract
Disclosed herein is a method for producing a 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine. The method comprises forming a reaction mixture comprising at least one substituted or unsubstituted phenolphthalein, at least one substituted or unsubstituted primary hydrocarbyl amine, and an acid catalyst; and heating the reaction mixture to a temperature of less than 180° C. to remove a distillate comprising water and form a crude 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine product; where the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine has a formula: where Ris selected from the group consisting of a hydrogen and a hydrocarbyl group, and Ris selected from the group consisting of a hydrogen, a hydrocarbyl group, and a halogen.