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:
Dec. 10, 1991
Filed:
Jul. 26, 1990
Richard Vicari, Chatham Township, Morris County, NJ (US);
Mohammad Aslam, Corpus Christi, TX (US);
Wilson B Ray, Beeville, TX (US);
Kenneth G Davenport, Hofheim, DE;
Ralph Dammel, Mainz-Bretzenheim, DE;
Juergen Lingnau, Mainz-Laubenheim, DE;
Karl-Friedrich Doessel, Wiesbaden, DE;
Hoechst Celanese Corporation, Somerville, NJ (US);
Abstract
3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After subsequent esterification with acetic anhydride and catalyzed hydrogenation to form 1-(3',5'-dimethyl-4'-acetoxyphenyl)ethanol, this intermediate is then dehydrated with an acid and a polymerization inhibitor to produce 3,5-dimethyl-4-acetoxystyrene.