Mildew resistant paint compositions comprising an isothiazolone and a water-insoluble zinc compound, articles, and methods

Process for preventing chemical degradation of an isothiazolone of the formula:

• ##STR2## wherein Y is substituted or unsubstituted alkyl, unsubstituted or halo substituted alkenyl or alkynyl, unsubstituted or substituted cycloalkyl, unsubstituted or substituted aralkyl, or hydrogen, R is hydrogen, chloro, or methyl, and R.sub.1 is hydrogen or methyl;
• which then mixed into a film-forming, non-wood penetrating, organic polymeric latex emulsion paint vehicle comprising mixing an effective amount of a water-insoluble, organic solvent soluble zinc salt of an organic carboxylic acid selected from the group consisting of octoate, hexanoate, heptanoate, decanoate, dodecanoate, cyclohexylcarboxylate, 2-ethylhexanoate, neodecanoate, oleate, alkanoate (mixture of about (C.sub.2 -C.sub.13) alkyl carboxylates), with said isothiazolone so as to prevent chemical degradation of said isothiazolone in said latex.