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:
Jan. 28, 2020
Filed:
Jul. 12, 2017
Sabic Global Technologies B.v., Bergen Op Zoom, NL;
Sivakumar Sreeramagiri, Bangalore, IN;
Deshmukh Sandesh Shivajirao, Bangalore, IN;
Samir Anapat, Bangalore, IN;
Vishal Keshaorao Karmore, Bangalore, IN;
Sanjay Katrekar, Bangalore, IN;
Alok Pal, Bangalore, IN;
SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom, NL;
Abstract
A continuous method for the manufacture of a 2-aryl-3,3-bis(hydroxyaryl)phthalimidine comprising continuously heating an anhydride with a phenol in the presence of a catalyst and a first co-catalyst, to form a first reaction mixture comprising a phenolphthalein compound; precipitating the phenolphthalein compound; combining a primary arylamine with an acid catalyst and a second co-catalyst to form a second reaction mixture; adding the phenolphthalein compound to the second reaction mixture; continuously heating the second reaction mixture to provide a third reaction mixture comprising a crude phthalimidine; and treating the crude phthalimidine to remove aminophenol and purify the phthalimidine is provided.