Storage-stable, synergistic microbicidal concentrates containing an isothiazolone, an amine and an oxidizing agent

1. A microbicidal composition in the form of a concentrate comprising:

a) one or more isothiazolin-3-one (isothiazolone);

b) one or more organic amine selected from N-dodecylpropane-1,3-diamine and bis(aminopropyl)-dodecylamine; and

c) one or more oxidizing agent selected from the group consisting of: chloric acid, perchloric acid, bromic acid, iodic acid, periodic acid and salts thereof, nitrates, H 2 O 2 , H 2 O 2 — donors, sodium percarbonate, sodium perborate, urea peroxide, peroxides, t-butyl peroxide, percarboxylic acids, peracetic acid and salts thereof, persulphuric acids and salts thereof, peroxodisulphonic acid and salts thereof, perphosphoric acids and salts thereof, transition metals, Cu, Zn and Fe in relatively high oxidation states, disulphides, pyrion disulphide, oxidases, glucose peroxidase, potassium iodate, sodium periodate, sodium bromate, and Cu(II) salts.

2. The composition according to claim 1 , wherein the one or more isothiazolone is selected from the group consisting of 2-methylisothiazolone (MIT), 1,2-benzisothiazolone (BIT), 2-n-octylisothiazolone (OIT), 5-chloro-2-methylisothiazolone, N-methylbenzisothiazolone, n-butylbenzisothiazolone, 4,5-dichloro-2-octylisothiazolone and mixtures thereof.

3. The composition according to claim 1 , wherein the one or more isothiazolone comprises a mixture of MIT and BIT.

4. The composition according to claim 1 , wherein the one or more isothiazolone comprises a mixture of MIT and OIT.

5. The composition according to claim 1 , wherein the amount of component a) is 0.5 to 15% by weight.

6. The composition according to claim 1 , wherein the amount of component b) is 0.5 to 15% by weight.

7. The composition according to claim 1 , wherein the amount of component c) is 0.01 to 10% by weight.

8. The composition according to claim 1 , further comprising

additional microbicidal active ingredients, functional additives and/or auxiliaries.

9. The composition according to claim 1 , wherein the composition has a pH in a range of from 2 to 14.

10. A method of preserving a water-containing or water-dilutable technical or domestic product, comprising metering into the product an effective amount of the composition according to claim 1 .

11. The method according to claim 10 , wherein the technical or domestic product is selected from the group consisting of polymer dispersions, paints, adhesives, paper coating compositions, textile softening and sizing compositions, washing raw materials, cleaning and polishing compositions, spinning baths, cooling lubricants, leather treatment compositions, silicone emulsions and bitumen emulsions.

12. A technical or domestic product comprising 0.01 to 1% by weight of the composition according to claim 1 .

13. The composition according to claim 1 , wherein the composition has a pH in the range of from 8 to 10.

14. A technical or domestic product comprising 0.1 to 0.3% by weight of the composition according to claim 1 .

15. The method according to claim 10 , wherein the composition is metered into the product to a final concentration of 0.01 to 1% by weight.

16. The composition according to claim 1 , wherein the one or more organic amine comprises bis (aminopropyl)-dodecylamine.

17. The composition according to claim 1 , wherein the one or more oxidizing agent comprises potassium iodate.

18. The composition according to claim 1 , comprising 80-96% by weight of solvent selected from the group consisting of water, alcohols, ethanol, propanol, benzyl alcohol, glycols, ethylene glycol, propylene glycol, dipropylene glycol, butanediols, glycol ethers, butyl glycol, butyl diglycol, phenoxyethanol, phenoxypropanols, polyols, glycerol, alkanediols, alkyl glycerol ethers, and mixtures thereof.

19. The composition according to claim 1 , comprising 80-96% by weight of water.