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:
Oct. 17, 1989
Filed:
Dec. 15, 1987
Werner Stegmann, Liestal, CH;
Hans R Meier, Marly, CH;
Samuel Evans, Marly, CH;
Roger Martin, Tentlingen, CH;
Reto Luisoli, Hostein, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
There is disclosed a process for the preparation of compounds of formula I or II ##STR1## from phenols by reaction with formaldehyde and mercaptans in the presence of mono-, di- or trimethylamine or mono- or diethylamine. The symbols R.sub.1 is alkyl, hydroxy or alkoxycarbonyl substituted alkyl; alkyl; aryl, cycloalkyl or aralkyl, R.sub.2 is hydrogen, alkyl, alkenyl or halogen, R.sub.3 and R.sub.4 are independently alkyl, allyl, cycloalkyl, phenyl, benzyl, halogen or --CH.sub.2 --S--R.sub.1, Z.sub.1 is --S-- or alkylene, and Z.sub.2 is hydrogen, alkyl or --CH.sub.2 --S--R.sub.1. The mercaptomethylphenols are valuable antioxidants for plastics, elastomers, mineral oils and synthetic lubricants.