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:
Apr. 07, 2009
Filed:
Mar. 30, 2007
Rajshekhar Basale, Karnataka, IN;
Balakrishnan Ganesan, Karnataka, IN;
Venkata Rama Narayanan Ganapathy Bholta, Bangalore, IN;
Gurram Kishan, Karnataka, IN;
Surendra Kulkarni, Karnataka, IN;
Pradeep Nadkarni, Karnataka, IN;
Suresh Shanmugam, Karnataka, IN;
Ravindra Vikram Singh, Utter Pradesh, IN;
Rajshekhar Basale, Karnataka, IN;
Balakrishnan Ganesan, Karnataka, IN;
Venkata Rama Narayanan Ganapathy Bholta, Bangalore, IN;
Gurram Kishan, Karnataka, IN;
Surendra Kulkarni, Karnataka, IN;
Pradeep Nadkarni, Karnataka, IN;
Suresh Shanmugam, Karnataka, IN;
Ravindra Vikram Singh, Utter Pradesh, IN;
SABIC Innovative Plastics IP B.V., Bergen op Zoom, NL;
Abstract
Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 95 weight percent phenolphthalein, based on the total weight of phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is then triturated with a trituration solvent and washed to obtain a second solid, wherein the second solid comprises greater than or equal to 97 weight percent 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, based on the total weight of the second solid. The second solid may be polymerized to form a polycarbonate.