Patent ID: 6663917
Filing Date: 2003-12-16
Classification: C08F,C08L,C09D,C09J

Abstract:
A method for producing a coating on a friable surface comprising:(1) applying to said friable surface a layer of an aqueous coating composition comprising a plurality of polymeric particles, each of said particles consisting essentially of: (a) at least one polymer A having a glass transition temperature of âˆ’20Â° C. to 100Â° C., wherein said polymer A is an emulsion polymer comprising: (i) 5-99.5% by weight, based on said polymer A weight, of at least one copolymerized ethylenically unsaturated first nonionic monomer having a water solubility at 25Â° C. of 8% or more by weight, based on the weight of water; (ii) 0-94.5% by weight, based on said polymer A weight, of at least one copolymerized ethylenically unsaturated second nonionic monomer having a water solubility at 25Â° C. of less than 8% by weight, based on the weight of water; and (iii) at least one copolymerized acid monomer, such that the acid number of said polymer A is 3 to 100 mg of KOH per g of polymer; and (b) at least one polymer B having a glass transition temperature of âˆ’20Â° C. to 100Â° C., wherein said polymer B is an emulsion polymer comprising, as polymerized units, at least one ethylenically unsaturated nonionic monomer, wherein said particles have an average particle diameter less than 120 nanometers; and (2) drying said coating composition.