Method for the production of biocidal or biostatic 3-isothiazoli

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

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548213, C07D27502

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active

058246959

ABSTRACT:
There is indicated a method for the production of qualitatively improved biocidal or biostatic compositions which comprise water and/or a polar organic solvent and contain at least one 3-isothiazolinone of the general formula ##STR1## in which Y, R and R' have the meanings indicated, 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 in the manner that it is stored at a pH of 0.2 to 1.5 and a temperature of at most 40.degree. C. for a period of at least 48 hours and then again brought to a higher pH. The compositions produced in this manner have an improved appearance and increased storage stability.

REFERENCES:
patent: 3870795 (1975-03-01), Miller et al.
patent: 5137899 (1992-08-01), Petigara et al.
patent: 5480898 (1996-01-01), Lidner
patent: 5512213 (1996-04-01), Paterson
patent: 5519141 (1996-05-01), Nita et al.
patent: 5554635 (1996-09-01), Rei et al.
European Search Report, Den Haag, 22 Apr. 1996, Examiner Lamers, W.
Derwent Abstract of JP890232595 9-07 (1989).

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