# US 9,872,496 B2 · Microbicidal preparations based on 1, 2-benzisothiazonlin-3-one with a content of aromatic alcohol

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- Number: US 9,872,496 B2
- Document ID: US9872496B2
- Status: Granted
- Kind: B2
- Application number: 11/902,401
- Filed: 2007-09-21
- Published: 2008-12-04
- Granted: 2018-01-23
- Earliest claimed: 2006-09-21
- Assignees: Air Liquide Sante (International)
- Applicants: Wolfgang Beilfuss; Gisela Hahn; Klaus Weber; Ralf Gradtke; Wolfgang Siegert
- Inventors: Wolfgang Beilfuss; Gisela Hahn; Klaus Weber; Ralf Gradtke; Wolfgang Siegert
- Web page: https://patentgrep.com/patent/US9872496B2

## CPC

- A01N 43/80: five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

The preparation according to claim 1, wherein the water in present in an amount of at least 70% by weight.

### Claim 4 (depends on 1)

The preparation according to claim 1, having a pH of at least 12.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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).

### Claim 7 (depends on 1)

The preparation according to claim 1, having a pH in a range of 12.8 to 13.3.

### Claim 8 (depends on 1)

The preparation according to claim 1, wherein component (a) is present in an amount of 8% to 10% by weight.

### Claim 9 (depends on 1)

The preparation according to claim 1, wherein component (b) is present in an amount of 4% to 8% by weight.

### Claim 10 (depends on 1)

The preparation according to claim 1, wherein component (c) is present in an amount of 7% to 13% by weight.

### Claim 11 (depends on 1)

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.