Back to results
US 5,399,423 AGranted
Ignition resistant meltblown or spunbonded insulation material
AssigneeThe Dow Chemical Company
InventorsFrancis P. McCullough, Bhuvenesh C. Goswami, Robert T. Patton
Life of this patent
Estimating the term…
Abstract
An ignition resistant fibrous material for use as insulation. The material comprises a multiplicity of meltblown or spunbonded thermoplastic filaments in combination with a multiplicity of nonlinear, nongraphitic carbonaceous fibers. The carbonaceous fibers have a Young's modulus of greater than 300,000 psi and reversible deflection ratio that is equal to or less than 1.2:1.
Claims35
An ignition resistant fibrous insulation material comprising the combination of:
- a) a multiplicity of meltblown or spunbonded thermoplastic microfibers having an average diameter of less than 15 microns, and
- b) a multiplicity of nonlinear, nongraphitic carbonaceous fibers having a Young's modulus of at least 300,000 psi and a reversible deflection ratio equal to or less than 1.2:1, said carbonaceous microfibers adhering to said thermoplastic fibers and being present on at least one surface in an amount of about 1 to 90% by weight of said insulation material or throughout said fibrous insulation material in an amount of about 10 to 90 weight percent of said insulation material to provide ignition resistance to the insulation material.
A process for making an ignition resistant fibrous insulation material comprising the steps of:
- a) extruding streams of a heat softened thermoplastic polymer through orifices in an extrusion die to form a multiplicity of fibers,
- b) blowing a stream of heated air into a stream of heat softened fibers to attenuate said fibers and to form microfibers having an average diameter of less than 15 microns,
- c) introducing a multiplicity of nonlinear, nongraphitic carbonaceous fibers having a Young's modulus of at least 300,000 psi and a reversible deflection ratio equal to or less than 1.2:1 into said stream of thermoplastic microfibers, said carbonaceous fibers adhering to said thermoplastic microfibers to form said insulation material and being present on at least one surface of said insulation material in an amount of about 1 to 90% by weight of said insulation material or throughout said insulation material in an amount of about 10 to 90 weight percent of said insulation material to provide ignition resistance to the fibrous insulation material.
Dependencies are inferred from the claim text.