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. 31, 2006
Filed:
Dec. 31, 2003
Thanikavelu Manimaran, Baton Rouge, LA (US);
Alvin E. Harkins, Jr., Baton Rouge, LA (US);
Samuel H. Dubois, Grans, FR;
Thomas J. Callender, Baton Rouge, LA (US);
Thanikavelu Manimaran, Baton Rouge, LA (US);
Alvin E. Harkins, Jr., Baton Rouge, LA (US);
Samuel H. Dubois, Grans, FR;
Thomas J. Callender, Baton Rouge, LA (US);
Albemarle Corporation, Richmond, VA (US);
Abstract
A process for brominating a styrenic polymer in an organic solvent in the presence of an antimony trihalide catalyst such that a reaction mass containing brominated styrenic polymer in an organic phase is formed is improved by mixing hydrochloric acid or hydrobromic acid, or both, with said reaction mass at least once to extract antimony catalyst residues from said reaction mass as an acidic aqueous phase. Preferably, catalyst residues are recovered from the acidic aqueous phase and still more preferably, recovered antimony trihalide catalyst residues are recycled to constitute at least a portion of the antimony trihalide catalyst used in preparing the brominated styrenic polymer.