Patent ID: 8557388
Filing Date: 2013-10-15
Classification: B82Y,C08G,C09D,Y10T

Abstract:
1. A polyurethane or polyurea rain erosion resistant coating composition for protecting a leading edge substrate on an airfoil against liquid and solid particle erosion, comprising: an isocyanate-terminated prepolymer with an isocyanate content of about 0.5 to about 40 weight percent, based on the weight of the prepolymer; a curing agent selected from the group consisting of an aldimine, a ketimine, a polyaspartic ester, a polyamine, a polyol and mixtures thereof; and a flatting agent, having a particle size of about 1 to about 20 micrometers present at a level of about 1 to about 15 weight percent based on the total weight of the said polyurethane or polyurea coating composition, and selected from the group consisting of silica, polymeric beads, talc, alumina, calcium carbonate, urea-formaldehydes and mixtures thereof; said polyurethane or polyurea rain erosion resistant coating composition in dry cured form having a tensile strength greater than 1000 psi (70 kg/cm