Antimicrobial barrier coatings and methods of use

Abstract

Barrier/sealer compositions impart at least biostatic activity to porous substrates, particularly architectural building materials, such as wood products, providing extended protection against the development of damaging fungi, such as mold, mildew and yeasts, as well as bacterial infestation. The protective sealer compositions comprise at least one antimicrobial agent, such as a fungicide and a film forming combination comprising a continuous film forming polymer and a water repellent compound. The spectrum of activity can also be potentiated to impart expanded biocidal activity to effectively kill and clean infected porous substrates and extend the useful life expectancy of architectural building materials by the introduction of other additives, including peroxide and antibacterial quaternary ammonium compounds.

1 . A protective barrier composition for porous substrates, which comprises an antimicrobial agent, a plasticizer, a surfactant, a continuous film forming polymer and a water repellent compound.  
   
   
       2 . The protective barrier composition of  claim 1 , wherein the antimicrobial agent comprises at least a fungicidal agent, the surfactant is a nonionic surface active agent, the continuous film forming polymer is a water based vinyl resin and the water repellent compound is a waxy compound.  
   
   
       3 . The protective barrier composition of  claim 2 , wherein said at least a fungicidal agent is a benzimidazole, the continuous film forming polymer is a vinyl acrylic latex, the waxy compound is a paraffin oil, and the pH of the composition is adjusted to about 7.0.  
   
   
       4 . A protective barrier composition for porous substrates, which comprises a benzimidazole fungicidal agent, hydrogen peroxide, a quaternary ammonium compound, a plasticizer, a nonionic surfactant, a continuous film forming polymer in combination with a waxy water repellent compound.  
   
   
       5 . The protective barrier composition of  claim 4 , which is an aqueous solution comprising from about 0.01 to about 0.10 percent-by-weight of said benzimidazole fungicidal agent; from about 0.002 to about 0.04 percent-by-weight of said hydrogen peroxide; from about 0.05 to about 5.0 percent-by-weight of said quaternary ammonium compound; from about 0.10 to about 3.0 percent-by-weight of said nonionic surfactant, from about 0.50 to about 4.0 percent-by-weight of said plasticizer; from about 30 to about 60 percent-by-weight of said continuous film forming polymer and from about 2 to about 4 percent-by-weight of said waxy water repellent compound.  
   
   
       6 . A method for protecting a porous substrate from the development of at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 1 .  
   
   
       7 . A method for protecting a porous substrate from the development of at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 2 .  
   
   
       8 . A method for protecting a porous substrate from the development of at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 3 .  
   
   
       9 . A method for protecting a porous substrate from the development of at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 4 .  
   
   
       10 . A method for protecting a porous substrate from the development of at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 5 .  
   
   
       11 . A method for treating a porous substrate having at least one member selected from the group consisting of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 1 .  
   
   
       12 . A method for treating a porous substrate having at least one of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 2 .  
   
   
       13 . A method for treating a porous substrate having at least one of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 3 .  
   
   
       14 . A method for treating a porous substrate having at least one of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 4 .  
   
   
       15 . A method for treating a porous substrate having at least one of mold, mildew and bacterial infestation, which comprises the step of contacting said substrate with an effective amount of the protective barrier composition of  claim 5.