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:
Feb. 27, 2006
Filed:
Aug. 14, 2003
Patrick Joseph Mccloskey, Watervliet, NY (US);
Timothy Brydon Burnell, Downington, PA (US);
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Elliott West Shanklin, Altamont, NY (US);
Paul Michael Smigelski, Jr., Schenectady, NY (US);
Ganesh Kailasam, Evansville, IN (US);
Patrick Joseph McCloskey, Watervliet, NY (US);
Timothy Brydon Burnell, Downington, PA (US);
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Elliott West Shanklin, Altamont, NY (US);
Paul Michael Smigelski, Jr., Schenectady, NY (US);
Ganesh Kailasam, Evansville, IN (US);
General Electric Company, Schenectady, NY (US);
Abstract
High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of methyl salicylate with phosgene in the presence of a phase transfer catalyst (PTC) in an interfacial reaction system in which the pH of the aqueous phase was greater than 9.3. Using the method of the present invention conversions of greater than 99% were obtained whereas under standard conditions using triethylamine as the catalyst conversions were limited to 70-75% of the methyl salicylate starting material even with a 20 mole % excess of added phosgene. The optimized conditions of the of the present invention use only a slight excess of phosgene and represent an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally.