Synergetic biocidal composition comprising 2-methylisothiazoline-3-on

Abstract

The invention relates to a biocidal composition which can be added to materials which can be attacked by harmful micro-organisms. The composition comprises 2-methylisothiazoline-3-on as biocidal active ingredient and at least one other biocidal active ingredient. The biocidal composition is characterised in that the composition contains formaldehyde or a formaldehyde-depot material, 2-brom-2-nitro-1,3 propandiol, polyhexamethylene biguanide, o-phenylphenol, pyrithione, n-butyl-1,2-benzisothiazoline-3-on, n-hydroxymenthyl-1,2-benzisothiazoline-3-on or benzalkonium chloride as said other biocidal active ingredient.

We claim:  
     
         1 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises formaldehyde or a formaldehyde-releasing substance as further biocidal active ingredient.  
     
     
         2 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises 2-bromo-2-nitro-1,3-propanediol as further biocidal active ingredient.  
     
     
         3 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises polyhexamethylenebiguanide as further biocidal active ingredient.  
     
     
         4 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises o-phenylphenol as further biocidal active ingredient.  
     
     
         5 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises a pyrithione as further biocidal active ingredient.  
     
     
         6 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises N-butyl-1,2-benzoisothiazolin-3-one as further biocidal active ingredient.  
     
     
         7 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises N-hydroxymethyl-1,2-benzoisothiazolin-3-one as further active ingredient.  
     
     
         8 . A biocide composition, comprising 2-methylisothiazolin-3-one as biocidal active ingredient and at least one further biocidal active ingredient, as additive to materials capable of being attacked by harmful microorganisms, characterized in that the composition comprises benzylalkonium chloride as further active ingredient.  
     
     
         9 . A biocide composition as claimed in  claim 8 , characterized in that it comprises dimethylbenzylalkonium chloride as benzylalkonium chloride.  
     
     
         10 . A biocide composition as claimed in any of  claims 1  to  9 , characterized in that the 2-methylisothiazolin-3-one and the further biocidal active ingredient are present in a weight ratio of 1:100 to 100:1.  
     
     
         11 . A biocide composition as claimed in  claim 10 , characterized in that the 2-methylisothiazolin-3-one and the further biocidal active ingredient are present in a weight ratio of 20:80 to 80:20.  
     
     
         12 . A biocide composition as claimed in any of claims  1  or  11 , characterized in that the 2-methylisothiazolin-3-one is present in a concentration of from 1 to 50% by weight based on the entire biocide composition.  
     
     
         13 . A biocide composition as claimed in any of  claims 1  to  12 , characterized in that the further biocidal active ingredient is present in a concentration of from 1 to 50% by weight based on the entire biocide composition.  
     
     
         14 . A biocide composition as claimed in any of  claims 1  to  7 , characterized in that the 3-methylisothiazolin-3-one and the further biocidal active ingredient are present in a total concentration of from 1 to 100% by weight, based on the entire biocide composition.  
     
     
         15 . A biocide composition as claimed in  claim 14 , characterized in that the 3-methylisothiazolin-3-one and the further biocidal active ingredient are present in a total concentration of from 1 to 30% by weight, based on the entire biocide composition.  
     
     
         16 . A biocide composition as claimed in any of  claims 1  to  15 , characterized in that a polar and/or an unpolar liquid medium is/are present.  
     
     
         17 . A biocide composition as claimed in  claim 16 , characterized in that the polar liquid medium present is water, an alcohol, a glycol, a glycol ether, a glycol ester, a polyethylene glycol, a polypropylene glycol, N,N-dimethylformamide, 2,2,4-trimethylpentanediol monoisobutyrate or a mixture of at least two of these substances.  
     
     
         18 . A biocide composition as claimed in  claim 17 , characterized in that the polar liquid medium present is water.  
     
     
         19 . The use of a biocide composition as claimed in any of  claims 1  to  18  for controlling harmful microorganisms  
     
     
         20 . A substance mixture or material, preserved against harmful microorganisms, characterized by a content of a biocide composition as claimed in any of  claims 1  to  18 .