Patent ID: 8178205
Filing Date: 2012-05-15
Classification: B82Y,C08G,C09D,Y10T

Abstract:
1. An erosion resistant article comprising an airfoil shaped substrate having a leading edge surface exposed in use to high speed impingement of liquid or solid particles, said leading edge surface covered with a protective coating comprising: a layer of primer disposed on the leading edge surface; a basecoat layer containing at least one filler overlying said layer of primer; and a matte topcoat layer overlying said basecoat layer, wherein the basecoat layer has a tensile strength greater than 1000 psi (70 kg/cm 2 ), an elongation at break greater than 350%, a tensile set of less than 150%, and a Shore A hardness of 44A to 95A as measured at 68° F. when tested without filler and is made from a polyurethane or polyurea coating composition selected from the group consisting of a water dispersion of a pre-reacted polyurethane, a polyisocyanate cured with a curing agent, and an isocyanate-terminated prepolymer cured with the curing agent, said curing agent selected from a group consisting of an aldimine, a ketimine, a polyaspartic ester, a polyamine, a polyol and mixtures thereof; and wherein the matte topcoat layer is a polyurethane or polyurea composition forming a coating having a matte finish as measured according to ASTM D 523-89 (1999) with an 85 degree surface gloss less than 15.