Patent ID: 9139708
Filing Date: 2015-09-22
Classification: B29C,B29K,C04B,C08G,C08J,C08K,C08L,Y02W

Abstract:
1. A method of forming a polymeric composite material in an extruder, the method comprising: introducing at least one polyol and inorganic filler to a first conveying section of the extruder, wherein the inorganic filler comprises about 60 to about 85 weight percent of the polymeric composite material; transferring the at least one polyol and inorganic filler to a first mixing section of an extruder; mixing the at least one polyol and the inorganic filler in the first mixing section; transferring the mixed at least one polyol and inorganic filler to a second conveying section of the extruder; introducing a di- or poly-isocyanate to the second conveying section, wherein the ratio of the di- or poly-isocyanate to the at least one polyol, based on equivalent weight, is about 0.5:1 to about 1.5:1; transferring the mixed at least one polyol and inorganic filler and the di- or poly-isocyanate to a second mixing section; mixing the mixed at least one polyol and 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, wherein the method further comprises introducing fibrous material in the second conveying section or in a third conveying section, the third conveying section being located between the second mixing section and a third mixing section.