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:
Jan. 13, 1976
Filed:
May. 21, 1973
Annick Marthe Domergue, Eaubonne, FR;
Robert Frederic Sureau, Enghien-le-Bains, FR;
Jean Ernest Leboulenger, Taverny, FR;
Jean Marie Houssin, Enghien-le-Bains, FR;
Products Chimiques Ugine Kuhlmann, Paris, FR;
Abstract
A process for the preparation of an optical brightening agent falling within the formula: ##SPC1## In which R represents an alkyl group containing 1 to 4 carbon atoms, R.sub.1 and R.sub.2 each represent a hydrogen atom, an alkyl group containing 1 to 4 carbon atoms or a phenyl group either unsubstituted or substituted by at least one alkyl group containing 1 to 4 carbon atoms, R.sub.3 and R.sub.4 each represent an alkyl group containing 1 to 4 carbon atoms and A.sup.- represents a monovalent anion which comprises reacting a compound of the formula: ##SPC2## In which R.sub.1, R.sub.2, R.sub.3, R.sub.4, and A.sup.- have the meanings given above, with an alcoholate of the formula RO-Me in which R represents an alkyl group containing 1 to 4 carbon atoms and Me is an alkali metal; compounds falling within the formula: ##SPC3## Wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and A.sup.- have the meanings given above.