Aqueous coating compositions

Abstract

A pesticidal coating composition is provided which comprises an aqueous dispersion of at least one film-forming binder and at least one microencapsulated pesticide; wherein a coating prepared from such composition is substantially water-impermeable upon curing. The present invention further provides methods of coating substrates with the pesticidal coating composition, as well as substrates coated with the composition. The pesticidal coating compositions of the invention can be applied to substrates by professionals or non-professionals by spraying, painting, rolling, or brushing, before, during, or after construction.

1 . A coating composition comprising an aqueous dispersion of at least one microencapsulated pesticide and at least one film-forming binder; wherein a coating prepared from the composition is substantially water-impermeable according to ASTM D 870-2 at 20 degrees Celsius. 
   
   
       2 . A coating composition according to  claim 1 , comprising a pesticidally effective amount of a microencapsulated pesticide and a film-forming effective amount of a polymeric binder. 
   
   
       3 . The coating composition according to  claim 1 , wherein the microcapsule wall comprises a polyurea. 
   
   
       4 . The coating composition according to  claim 1 , wherein the microcapsule wall comprises an aminoplast. 
   
   
       5 . The coating composition according to  claim 1 , wherein the microcapsule wall comprises a polyurethane. 
   
   
       6 . The coating composition according to  claim 1 , wherein the microcapsule wall comprises a polyamide. 
   
   
       7 . The coating composition according to  claim 1 , wherein the binder comprises at least one latex polymer. 
   
   
       8 . The coating composition according to  claim 7 , wherein the latex polymer comprises a polymer selected from polymers, co-polymers and ter-polymers of styrene, alkyl styrenes, isoprene, butadiene, acrylonitrile, lower alkyl acrylates and methacrylates, vinyl chloride, vinylidene chloride, vinyl esters of lower carboxylic acids and alpha, beta-ethylenically unsaturated carboxylic acids and silicone. 
   
   
       9 . The coating composition according to  claim 1 , wherein the binder comprises an aqueous polyurethane dispersion. 
   
   
       10 . The coating composition according to  claim 1 , wherein the binder comprises a polymer dispersion having a particle size from 0.03 to 20 microns. 
   
   
       11 . The coating composition according to  claim 10 , wherein the binder comprises a polymer dispersion having a particle size is from 0.1 to 10 microns. 
   
   
       12 . The coating composition according to  claim 1 , wherein the binder is present in the coating composition in an amount sufficient to provide a cured coating which comprises at least about 50% by weight of the binder 
   
   
       13 . The coating composition according to  claim 1 , which further comprises at least one multi-functional monomer. 
   
   
       14 . The coating composition according to  claim 13 , which further comprises at least one bifunctional monomer. 
   
   
       15 . The coating composition according to  claim 1 , further comprising at least one additive selected from antimicrobial agents, non-encapsulated pesticides, rheology control agents, thickeners, surfactants, pigments, fillers, dispersants, freeze-thaw stabilizers and coalescents 
   
   
       16 . A coating composition according to  claim 18 , wherein the filler is selected from clay, calcium carbonate, glass fiber and titanium dioxide. 
   
   
       17 . A coating composition according to  claim 1 , wherein the antimicrobial agent is triclosan. 
   
   
       18 . A composition according to  claim 1 , wherein a cured film prepared from the composition has an MFFT of from 0 to 50 degrees Celsius. 
   
   
       19 . A method for providing a surface with a barrier, the method comprising (a) applying to the surface a coating composition comprising an aqueous dispersion of a pesticidally effective amount of at least one microencapsulated pesticide and a film-forming effective amount of at least one polymeric binder; and (b) allowing the applied composition to coalesce to form the barrier. 
   
   
       20 . A method of protecting building construction material with a coating composition of  claim 1 , comprising applying the composition onto at least one surface of the construction material. 
   
   
       21 . The method of  claim 20 , wherein the construction materials comprise wood, wood composites, gypsum wall board, cellulosic insulation, cement or cement composites, concrete blocks, ceiling tiles, utility penetrations or other synthetic materials. 
   
   
       22 . The method of  claim 20 , wherein the construction materials comprise a damp-proof membrane or a vapor retarder. 
   
   
       23 . The method of  claim 22 , wherein the damp-proof membrane or vapor barrier is corona treated prior to application of the composition. 
   
   
       24 . A barrier against pest invasion prepared in accordance with the method of  claim 19 . 
   
   
       25 . A composition according to  claim 1 , wherein the microencapsulated pesticide is an insecticide. 
   
   
       26 . A composition according to  claim 25 , wherein the microencapsulated insecticide is an termiticide. 
   
   
       27 . A composition according to  claim 1 , wherein the microencapsulated pesticide is a fungicide. 
   
   
       28 . A composition according to  claim 1 , which further comprises at least one non-microencapsulated pesticide. 
   
   
       29 . The method of  claim 19 , wherein the microencapsulated pesticide is a termiticide.