Claims
- 1. A synergistic bactericidal composition comprising an isothiazolinone or its acid addition salt having the formula ##STR6## wherein Y is (C.sub.1 -C.sub.8)alkyl, cyclohexyl, phenyl or benzyl or phenyl or benzyl substituted with up to two halogen atoms;
- R is a methyl group, a hydrogen atom or a halogen atom; and
- R' is a hydrogen atom or a halogen atom;
- and a bactericidal quaternary ammonium salt wherein the quaternary ammonium salt is selected from the group consisting of:
- (a) n-alkyl (C.sub.14 :50%; C.sub.12 :40%; C.sub.16 :10%)dimethylbenzylammonium chloride;
- (b) a mixture of 50% by weight alkyl (C.sub.14 :60%; C.sub.16 :30%; C.sub.12 :5%; C.sub.18 :5%)dimethylbenzylammonium chloride; and 50% alkyl (C.sub.12 :50%; C.sub.14 :30%; C.sub.16 :17%; C.sub.18 :3%)dimethylethylbenzylammonium chloride;
- (c) a mixture of (n-C.sub.8 to n-C.sub.18)alkyldimethylbenzylammonium chlorides containing not less than 40% by weight n-C.sub.12 alkyl, not less than 20% n-C.sub.14 alkyl and not less than 70% by weight total of n-C.sub.12 and n-C.sub.14 alkyl;
- (d) p-diisobutylphenoxyethoxyethyldimethylbenzylammonium chloride;
- (e) a mixture of 80% by weight of methyldodecylbenzyltrimethylammonium chloride and 20% of methyldodecylxylylenebis(trimethyl)ammonium chloride;
- (f) di-n-alkyl (C.sub.8 -C.sub.11 n-alkyl, average C.sub.10) dimethylammonium chloride; and
- the weight ratio of the 4-isothiazolin-3-one to the quaternary ammonium salt is from 5:1 to 1:50.
- 2. The composition of claim 1 wherein the 4-isothiazolin-3-one is a metal salt complex of the formula ##STR7## wherein M is a cation of a metal, such as barium, cadmium, calcium, chromium, cobalt, copper, iron, lead, lithium, magnesium, manganese, mercury, nickel, sodium, silver, strontium, tin, zinc, or the like;
- X is an anion forming a compound with the cation M, wherein the compound has sufficient solubility to form a metal salt complex;
- a is the integer 1 or 2; and
- n is an integer which for the anion X satisfies the valence of the cation M.
- 3. The composition of claim 1 wherein the quaternary ammonium salt is a mixture of n-C.sub.12 alkyldimethylbenzylammonium chloride, n-C.sub.14 alkyldimethylbenzylammonium chloride, and n-C.sub.16 alkyldimethylbenzylammonium chloride.
- 4. The composition of claim 3 wherein the 4-isothiazolin-3-one is the calcium chloride complex of 5-chloro-2-methyl-4-isothiazolin-3-one.
- 5. The composition of claim 3 wherein the 4-isothiazolin-3-one is 4,5-dichloro-2-cyclohexyl-4-isothiazolin-3-one.
- 6. The composition of claim 3 wherein the 4-isothiazolin-3-one is 5-chloro-4-methyl-2-(3-chloro phenyl)-4-isothiazolin-3-one.
- 7. A method of controlling bacteria in the presence of organic matter which comprises applying thereto an effective amount of the composition of claim 1.
- 8. A method of protecting a locus from bactericidal contamination in the presence of organic matter which comprises applying to the locus an effective amount of the composition of claim 1.
Parent Case Info
This application is a continuation-in-part application of United States application Ser. No. 426,881 filed Dec. 20, 1973, now abandoned.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
426881 |
Dec 1973 |
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