Fungicidal protective coating for air handling equipment

A method of protecting a surface from fungal colonization in a location subject to buildup of media for growth of fungus, the method comprising applying to the surface a latex coating formulation at a wet thickness of 5-30 mils (0.13-0.76 mm) and allowing the formulation to dry to a dried coating, the latex coating formulation being free of arsenic, mercury, lead, tin, chlorine and bromine, and comprising an emulsion of a polymer having sufficient adherence and flexibility so that the dried coating does not crack, blister or peel off under typical service conditions for said surface, said emulsion having suspended therein a mixture of fungicides, the fungicide mixture including a barium metaborate fungicide and a second fungicide selected from the group consisting of iodo alkynyl alkyl carbamates, diiodomethyl-p-tolylsulfone, 2-4-thiazolylbenzimidazole, 2-n-octyl-4-isothiazolin-3-one, zinc dimethyldithiocarbamate, zinc 2-mercaptobenzothiazole, potassium n-hydroxymethyl-n-methyldithiocarbamate, sodium 2-mercaptobenzothiazole, 5-hydroxymethoxymethyl-1-aza-3,7-dioxa-bicyclooctane, 2,3,5,6-tetrachloro-4-pyridine, zinc 2-pyridinethiol-1-oxide and N-trichloromethylthiophthalimide, the fungicides in said emulsion being present at a level sufficient to provide a zone of inhibition in the dried coating against growth of fungi of at least 1 mm.

A latex coating formulation, free of arsenic, mercury, lead, tin, chlorine and bromine, the formulation comprising an emulsion of a flexible polymer selected from the group consisting of acrylic, styrene-butadiene, styrene-acrylic, vinyl-acrylic, ethylene-vinyl acetate and vinylidene chloride polymers, the emulsion having suspended therein a mixture of fungicides, the fungicide mixture including a barium metaborate fungicide and a second fungicide selected from the group consisting of iodo alkynyl alkyl carbamates, diiodomethyl-p-tolylsulfone, 2-4-thiazolyl-benzimidazole, 2-n-octyl-4-isothiazolin-3-one, zinc dimethyldithiocarbamate, zinc 2-mercaptobenzothiazole, potassium n-hydroxymethyl-n-methyldithiocarbamate, sodium 2-mercaptobenzothiazole, 5-hydroxymethoxymethyl-1-aza-3,7-dioxa-bicyclooctane, 2,3,5,6-tetrachloro-4-pyridine, zinc 2-pyridinethiol-1-oxide and N-trichloromethylthiophthalimide and the fungicides being present in the formulation at a level which is effective to provide in a dried film of said formulation a zone of inhibition of at least 5 mm against at least two organisms selected from the group consisting of Aspergillus flavus, Penicillium funiculosum, Saccharomyces cerevisiae, Aureobasidium pullulans, Aspergillus fumigatus, Rhodotorula rubra, Trichoderma reesei, Gliochladium virens, Aspergillus versicolor, Chaetomium globosum and Aspergillus niger.