Claims
- 1. A method for the production of improved biocidal compositions which contain at least one 3-isothiazolinone of the general formula: ##STR3## in which 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 a manner known per se and then stabilized by the addition of a nitrate, said method characterized by the fact that the mixture obtained upon the production of the 3-isothiazolinone is subjected, after the addition of the nitrate, to an additional stabilization by storing it at a pH of 0.2 to 2.0 and a temperature of from 0.degree. C. to 40.degree. C. for a period of at least 2 days and thereupon bringing it again to a higher pH in the range of 2.5 to 3.5.
- 2. A method according to claim 1, characterized by the fact that the additional stabilization takes place at a pH of 0.5 to 1.5 and a temperature of 10 to 30.degree. C. for a period of 1 to 2 weeks.
- 3. A method according to claim 1, characterized by the fact that the additional stabilization takes place at a pH of 0.8 to 1.2 and a temperature of 10 to 30.degree. C. for a period of 1 to 2 weeks.
- 4. A method according to claim 1, characterized by the fact that as 3-isothiazolinone there is used 5-chloro-2-methyl-3-isothiazolinone and/or 2-methyl-3-isothiazolinone.
- 5. An improved biocidal 3-isothiazolinone composition prepared by the method of claim 1.
- 6. An improved biocidal 3-isothiazolinone composition prepared by the method of claim 1, characterized by the fact that the additional stabilization takes place at a pH of 0.5 to 1.5 and a temperature of 10 to 30.degree. C. for a period of 1 to 2 weeks.
- 7. An improved biocidal 3-isothiazolinone composition prepared by the method of claim 1, characterized by the fact that the additional stabilization takes place at a pH of 0.8 to 1.2 and a temperature of 10 to 30.degree. C. for a period of 1 to 2 weeks.
- 8. An improved biocidal 3-isothiazolinone composition prepared by the method of claim 1, characterized by the fact that as 3-isothiazolinone there is used 5-chloro-2-methyl-3-isothiazolinone and/or 2-methyl-3-isothiazolinone.
Priority Claims (1)
Number |
Date |
Country |
Kind |
951 18 145 |
Nov 1995 |
EPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This patent application is a continuation-in-part of patent application Ser. No. 08/751,223, filed Nov. 15, 1996, now U.S. Pat. No. 5,824,695.
US Referenced Citations (5)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
751223 |
Nov 1996 |
|