Microbicidal preparations based on 1, 2-benzisothiazonlin-3-one with a content of aromatic alcohol
Microbicidal preparations containing a) at least one 1,2-benzisothiazolin-3-one or its derivatives; b) at least one 2-mercaptopyridine N-oxide, or its salts and derivatives; c) at least one aromatic alcohol; and d) at least one alkalinizing agent, or a preparation prepared by mixing components a) to d), and having a pH of at least 11, are provided. The microbicidal preparations are clear and storage-stable, and are suitable for use as preservatives.
1. A preservative preparation, consisting of:
(a) 6 to 12% by weight of 1,2-benzisothiazolin-3-one;
(b) 3 to 9% by weight of 2-mercaptopyridine N-oxide or a salt thereof;
(c) 5 to 15% by weight of at least one aromatic alcohol, the alcohol selected from the group consisting of phenoxyethanol, phenoxypropanol, benzyl alcohol and mixtures thereof;
(d) 2 to 7% by weight of at least one alkalinizing agent comprising potassium hydroxide or a mixture of potassium hydroxide and sodium hydroxide; and
(e) 60 to 80% by weight of water,
wherein the preparation has a pH of at least 11, and is free of algicidal triazines.
2. The preparation according to claim 1 , consisting of:
(a) 8 to 10% by weight of 1,2-benzisothiazolin-3-one;
(b) 4 to 8% by weight of 2-mercaptopyridine N-oxide or a salt thereof;
(c) 7 to 13% by weight of the at least one aromatic alcohol; and
(d) 3 to 6% by weight of at least one alkalinizing agent comprising potassium hydroxide or a mixture of potassium hydroxide and sodium hydroxide.
3. The preparation according to claim 1 , wherein the water in present in an amount of at least 70% by weight.
4. The preparation according to claim 1 , having a pH of at least 12.
5. The preparation according to claim 1 , wherein the salt of 2-mercapto-pyridine N-oxide is a sodium salt, an alkali metal, an alkaline earth metal or a zinc salt.
6. A process for preparing the preparation according to claim 1 , comprising:
(1) first, adding component b) to water, then
(2) adding component a), then
(3) adding component d), and finally
(4) adding component c).
7. The preparation according to claim 1 , having a pH in a range of 12.8 to 13.3.
8. The preparation according to claim 1 , wherein component (a) is present in an amount of 8% to 10% by weight.
9. The preparation according to claim 1 , wherein component (b) is present in an amount of 4% to 8% by weight.
10. The preparation according to claim 1 , wherein component (c) is present in an amount of 7% to 13% by weight.
11. The preparation according to claim 1 , wherein the at least one alkalizing agent (d) consists of a mixture of sodium hydroxide and potassium hydroxide, said mixture having at least 70% potassium hydroxide by weight.