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:
May. 01, 1990
Filed:
Dec. 14, 1988
Werner Stegmann, Liestal, CH;
Reto Luisoli, Holstein, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A process for the preparation of a mixture of 2-(2-hydroxyphenyl)benzotriazole which is liquid at room temperature by alkylating 2-(2-hydroxy-5-methylphenyl)benzotriazole with a C.sub.8 -C.sub.14 .alpha.-olefin in the melt at elevated temperature, in the presence of sulfonic acid as catalyst, comprising using not less than 0.5 mol of the acid catalyst and 1.5-3 mol of .alpha.-olefin per mol of 2-(2-hydroxy-5-methylphenyl)benzotriazole, carrying out the alkylation in the temperature range from 165.degree. to 190.degree. C., separating the crude product phase upper phase) from the sulfonic acid phase, and working up said crude product phase by distillation by means of a thin-film evaporator, a thin-film evaporator fitted with a distillation column, or a short path distillation apparatus.