Patent ID: 6884507

Claim:
A turbine blade comprising: (I) a metal or composite blade having at least one pocket adapted for forming a portion of a mold; and (II) a thermoset polymeric composition having a modulus of elasticity of at least about 250 psi (1.72 MPa), comprising the reaction product of (a) a curative system comprising at least one compound having at least two active hydrogen-containing groups per molecule; and (b) a prepolymer composition comprising the product of the melt blending of (i) hollow polymeric microspheres having an average diameter of from about 40-120 μm, said microspheres comprised of a shell portion and a hollow core portion, said shell portion comprised of at least one thermoplastic resin; and (ii) at least one polyether elastomer, having a molecular weight of about 250 Daltons to 30,000 Daltons, and an isocyanate functionality content of about 3.0 to 7.0%; said thermoset polymeric composition being bonded to the blade surfaces to form a blade-polymeric composition composite.