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:
Jul. 22, 2003
Filed:
Apr. 03, 2001
Armando Di Teodoro, Rheinfelden, DE;
Werner Hölzl, Eschentzwiller, FR;
Dieter Reinehr, Kandern, DE;
Rudolf Zink, Therwil, CH;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
A description is given of a three-step process for the preparation of 4,4′-dihalogen-o-hydroxydiphenyl compounds of formula (1) which comprises: a) hologenating an alkoxyphenol of formula (6) (=a ), reacting the resulting halogenated phenol compound of formula (5) with p-dihalobenzene of formula (4 ) in the presence of copper and/or copper salts to the diphenyl ether compound of formula (2) (=a ) and subsequent ether fission to the diphenyl ether compound of formula (1) (=a ); or b) reacting an alkoxyphenol of formula (6) with the halophenol of formula (4 ) to the compound of formula (3) (=b ), then halogenating this compound (=b ) and subsequent ether fission of the resulting compound of formula (2) to the diphenyl ether compound of formula (1) (=b ). The compounds of formula (1) are used for protecting organic materials and objects against microorganisms.