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OwnerWendy Wen-Ling Lin, James Claude Carnahan +3inventors
InventorsWendy Wen-Ling Lin, James Claude Carnahan, Kevin Warner Flanagan, Scott Roger Finn, Joseph Timothy Stevenson
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The present invention provides tough, high modulus, low density thermoset polyurethane compositions which are useful in general as, for example, cast structural materials and in a preferred embodiment can be cured directly onto an aircraft engine fan blade, thereby providing a lighter blade, without concomitant loss in structural integrity or blade performance due to, for example, resistance to foreign object impacts and fuel efficiency. In a preferred embodiment, the composition is comprised of bis-amine compounds reacted with isocyanate-functional polyether polymers in the presence of hollow polymeric microspheres. The thermoset polymer compositions are formed by casting into a mold which is formed by a cavity within the metallic or composite fan blade or guide vane in the form of a pocket and a removable caul sheet. After the elastomeric polyurethane foam is injected through at least one injector port into the mold, the foam is cured.
A thermoset polymer composition having a modulus of elasticity of at least about 250 psi (1.72 MPa), comprising
A a thermoset polymer composition having a modulus of elasticity of at least about 250 psi (1.72 MPa), comprising the reaction product of
An article comprised of a thermoset polymeric composition having a modulus of elasticity of at least 250 psi (1.72 MPa), comprising the reaction product of
A turbine fan blade or guide vane comprising
Dependencies are inferred from the claim text.