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:
Feb. 29, 2000
Filed:
Apr. 23, 1998
Victor Eliu, Lorrach, DE;
Werner Kanert, Hegenheim, FR;
Adriano Indolese, Mohlin, CH;
Philipp Wyser, Ittingen, CH;
Anita Schnyder, Allschwil, CH;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
A process for the production of a fluorescent whitening agent of formula: ##STR1## in which X and Z are as defined herein, comprising A) rearranging a hydrazobenzene compound having the formula: ##STR2## in which Z is as defined herein, to produce in situ a compound having the formula: ##STR3## B) diazotising the compound of formula (3) to produce a compound having the formula: ##STR4## in which Z has its previous significance and G.sub.1 is a counter ion; and C) reacting the compound of formula (4) with 2 moles of a compound having the formula: ##STR5## in which X and n have their previous significance, in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor, to produce a compound having the formula (1).