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US 7,682,697 B2Granted
Fiber reinforced thermoplastic sheets with surface coverings
AssigneeAzdel, Inc.
InventorsVenkat Krishna Raghavendran, Thomas Arnold Ebeling
Life of this patent
Estimating the term…
Abstract
A composite sheet material in one embodiment includes a porous core layer. The porous core layer includes a thermoplastic polymer, about 20 weight percent to about 80 weight percent of reinforcing fibers based on a total weight of the porous core layer, and an effective amount of a flame retardant agent.
Claims26
A composite sheet material comprising a porous core layer, said core layer comprising:
- a web of open celled structures defined by random crossing over of reinforcing fibers held together by a thermoplastic polymer;
- said web comprising about 20 weight percent to about 80 weight percent of reinforcing fibers based on a total weight of said porous core layer, and
- an effective amount of a flame retardant agent, said flame retardant agent comprising at least one of N, P, As, Sb, Bi, S, Se, Te, Po, F, Cl, Br, I, and At.
A method of manufacturing a porous fiber-reinforced thermoplastic sheet, said method comprising:
- providing a porous fiber-reinforced thermoplastic sheet comprising at least one porous core layer comprising a web of open celled structures defined by random crossing over of reinforcing fibers held together by a thermoplastic material, said web comprising from about 20 weight percent to about 80 weight percent fibers, and an effective amount of a flame retardant agent, said flame retardant agent comprising at least one of N, P, As, Sb, Bi, S, Se, Te, Po, F, Cl, Br, I, and At;
- and
- laminating at least one skin to a surface of the porous fiber-reinforced thermoplastic sheet, each skin comprising at least one of a thermoplastic film, an elastomeric film, a metal foil, a thermosetting coating, an inorganic coating, a fiber based scrim, a non-woven fabric, and a woven fabric, the skin having a limiting oxygen index greater than about 22, as measured per ISO 4589-2, first edition, 1996, to enhance at least one of the flame, smoke, heat release and gaseous emissions characteristics of the porous fiber-reinforced thermoplastic sheet.
Dependencies are inferred from the claim text.