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. 26, 1999
Filed:
Apr. 30, 1997
Rudiger Baum, Waghausel, DE;
Thor Chemie GmbH, , DE;
Abstract
There is provided a method for the production of improved biocidal compositions which comprise at least one 3-isothiazolinone of the general formula ##STR1## Y is a hydrogen atom or an unsubstituted alkyl radical having 1 to 18 carbon atoms, a cylo alkyl radical having 5 to 8 carbon atoms, an aralkyl radical having 7 to 11 carbon atoms or an aryl radical having 6 to 10 carbon atoms and R and R' are in each case a hydrogen atom or halogen atom or a C.sub.1 to C.sub.4 -alkyl radical, or, when taken together, R and R' contain an alkylene group to form a hydrocarbon ring, the 3-isothiazolinone being produced in known manner and then stabilized by the addition of a nitrate. The method is characterized by the fact that the mixture obtained upon the production of the 3-isothiazolinone is subjected to an additional stabilization after the addition of the nitrate by storing it at a pH of 0.2 to 2.0 and a temperature of at most 40.degree. C. for a period of at least 2 days and then again neutralized to a higher pH in the range of 2.5 to 3.5.