Stabilized 2-mercaptopyridene-1-oxide and derivatives

Claim 1

An antimicrobial composition comprising: (a) a biocide selected from the group consisting of 2-mercaptopyridine-1-oxide, sodium-2-mercaptopyridine-1-oxide, calcium-2-mercaptopyridine-1-oxide, zinc-2-mercaptopyridine-1-oxide, antimony-2-mercaptopyridine-1-oxide, cadmium-2-mercaptopyridine-1-oxide, tin-2-mercaptopyridine-1-oxide, stannous chloride bis(-2-pyridyl-1-oxide)disulphide, di(lower alkyl)tin-2-mercaptopyridine-1-oxide, tri(lower alkyl)tin-2-mercaptopyridine-1-oxide, triphenyltin-2-mercaptopyridine-1-oxide and mixtures of these; (b) a first stabilizer comprising an organic phosphorous compound selected from the group consisting of alkyl phosphites, aryl phosphites, alkyl-aryl phosphites, di, tri and poly phosphites and glycol phosphonates and a combination thereof; and, (c) a second stabilizer comprising a benzotriazole compound selected from the group consisting of 2(3',5'-bis[1-methyl-1-phenyl ethyl]-2'-hydroxyphenyl)benzotriazole; 2(2'-hydroxy-5'-methyl phenyl)benzotriazole; 2,3(3',5'-di-t-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole; 2(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole; 2(3'-t-butyl-2'-hydroxy-5'-methyl phenyl)-5-chlorobenzotriazole; 2(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole; and, 2(2'-hydroxy-5-t-octylphenyl)benzotriazole, wherein with the weight percent of the biocide taken as "1", the ratio of biocide to first stabilizer to second stabilizer is in the range of 1:0.25:1.5 to 1:1.5:0.25.