EXTRUSION OF POLYURETHANE COMPOSITE MATERIALS
First Claim
1. A method of forming a polymeric composite material in an extruder, the method comprising:
- providing a composition comprising at least one polyol with at least one a di- or poly-isocyanate;
mixing the composition under high shear to provide a mixed composition;
immediately transferring the mixed composition to the extruder; and
adding a filler into the extruder when at least a portion of the mixed composition is present in the extruder.
2 Assignments
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Accused Products
Abstract
Methods of extruding polyurethane composite materials are described. One method includes introducing at least one polyol and organic and/or inorganic filler to a first conveying section of the extruder, transferring the at least one polyol and organic and/or inorganic filler to a first mixing section of an extruder, mixing the at least one polyol and the organic and/or inorganic filler in the first mixing section, transferring the mixed at least one polyol and organic and/or inorganic filler to a second conveying section of the extruder, introducing a di- or poly-isocyanate to the second conveying section, transferring the mixed at least one polyol and organic and/or inorganic filler and the di- or poly-isocyanate to a second mixing section, mixing the mixed at least one polyol and organic and/or inorganic filler with the di- or poly-isocyanate in the second mixing section of the extruder to provide a composite mixture, and transferring the composite mixture to an output end of the extruder. In some embodiments, the method may include pre-mixing a combination of an isocyanate and a polyol before introducing the mixture into the extruder. Some embodiments provide a method of forming a reinforced polymeric composite material in an extruder by pre-heating reinforcing fibers before introducing them to the extruders. Some embodiments provide a method of forming a polymeric composite material in an extruder, wherein the extruder die rotates while its inner surface in movable contact with a fixed solid component to reduce the amount of composite material that accumumlates on the inner surface of the die. Other related methods are also described.
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Citations
17 Claims
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1. A method of forming a polymeric composite material in an extruder, the method comprising:
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providing a composition comprising at least one polyol with at least one a di- or poly-isocyanate; mixing the composition under high shear to provide a mixed composition; immediately transferring the mixed composition to the extruder; and adding a filler into the extruder when at least a portion of the mixed composition is present in the extruder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming a reinforced polymeric composite material in an extruder, the method comprising:
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providing an extruder having a first temperature; providing a plurality of reinforcing fibers; preheating the fibers to a second temperature which is greater than the first temperature; introducing the fibers into the extruder; and reacting at least a portion of at least one polyol and at least a portion of at least one di- or poly-isocyanate in the presence of the fibers. - View Dependent Claims (9, 10, 11, 12)
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13. A method of forming a polymeric composite material in an extruder, the method comprising:
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providing a polymeric composite material in an extruder; and extruding the composite material through a die; wherein the die rotates during the extrusion process and further comprises an inner surface through which the polymeric composite material flows during the extrusion process; wherein the extruder further comprises a fixed solid component in movable contact with the inner surface of the die while the die rotates, wherein said contact is effective to reduce the amount of composite material which accumulates on the inner surface of the die during the extrusion process. - View Dependent Claims (14, 15, 16, 17)
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Specification