초록 ▼

An article made up of (1) a composite having a polyurethane matrix including fibrous or particulate reinforcement, the polyurethane matrix being formed in situ about the reinforcement by reaction of polyurethane forming components at a temperature below the melting point of the reinforcement and (2)

An article made up of (1) a composite having a polyurethane matrix including fibrous or particulate reinforcement, the polyurethane matrix being formed in situ about the reinforcement by reaction of polyurethane forming components at a temperature below the melting point of the reinforcement and (2) a polymeric film bound to at least one surface of the composite, the film being bound to the composite by adhesion to the polyurethane matrix which emerges or is enhanced as the matrix is formed in situ.

대표청구항 ▼

An article made up of (1) a composite having a polyurethane matrix including fibrous or particulate reinforcement, the polyurethane matrix being formed in situ about the reinforcement by reaction of polyurethane forming components at a temperature below the melting point of the reinforcement and (2)

An article made up of (1) a composite having a polyurethane matrix including fibrous or particulate reinforcement, the polyurethane matrix being formed in situ about the reinforcement by reaction of polyurethane forming components at a temperature below the melting point of the reinforcement and (2) a polymeric film bound to at least one surface of the composite, the film being bound to the composite by adhesion to the polyurethane matrix which emerges or is enhanced as the matrix is formed in situ. first pusher against the second charge; and (g) removing a seamless gasket from the die cavity, whereby the portion of the die cavity receiving the second charge has the same volume as the portion of the die cavity receiving the first charge. 2. The method as recited in claim 1, further comprising the step of venting the die cavity of air during steps (c) and (e). 3. The method as recited in claim 2, wherein venting comprises subjecting the die cavity to a vacuum. 4. The method as recited in claim 3, wherein the venting step comprises positioning the first pusher at an open end of the die cavity which open end has a bevelled surface, whereby a gap is defined between the first pusher and the die cavity for passage of air during the steps (c) and (e). 5. The method as recited in claim 3, further comprising the step of filtering the air extracted by venting the die cavity. 6. The method as recited in claim 1, further comprising the step of providing the die cavity with at least one burst of air prior to steps (d) and (f), whereby the burst of air bumps the partially compressed expanded intercalated graphite worms in the die cavity to displace entrained air therefrom. 7. The method as recited in claim 1, wherein the pressure of the second stream of air ranges from about 5 to about 30 pounds per square inch. 8. The method as recited in claim 1, further comprising the step of continuously expanding intercalated graphite flakes for producing a supply of expanded intercalated graphite worms to be communicated to the die cavity. 9. The method as recited in claim 1, further comprising the step of placing an annular insert on an upper surface of the first charge of the partially compressed expanded intercalated graphite worms in the die cavity.