Claims
- 1. A fibrous thermal insulation comprising an intimate blend of A) about 20 to 75% by weight of non-graphitic polymeric carbonaceous fibers having an LOI value greater than 40, a carbon content of less than 85 percent, a percent char value greater than 65, and a thermal conductivity less than 1 BTU ft/hr ft.sup.2 .degree. F. for providing a synergistic improvement in fire resistance, and B) crazed hollow thermoplastic fibers.
- 2. The insulation of claim 1 wherein said thermoplastic fibers comprise styrenic fibers.
- 3. The insulation of claim 2 wherein said styrenic fibers comprise about 6 to 12 crazes.
- 4. The insulation of claim 1 including a thermoplastic binder.
- 5. The insulation of claim 1, wherein said carbonaceous fibers are nonlinear.
- 6. The insulation of claim 5, wherein said carbonaceous fibers have a sinusoidal configuration and a reversible deflection ratio of greater than 1.2:1.
- 7. The fibers of claim 1, wherein said carbonaceous fibers are derived from a stabilized expanded acrylic fiber selected from acrylonitrile homopolymers, acrylonitrile copolymers and acrylonitrile terpolymers, wherein said copolymers and terpolymers contain at least 85 mole percent acrylic units.
- 8. The insulation of claim 1, wherein said carbonaceous fibers are derived from expanded fibers selected from the group consisting of aromatic polyamides, polybenzimidazole and polyacrylonitrile based fibers.
- 9. The insulation of claim 8, comprising linear and non-linear expanded carbonaceous fibers.
- 10. A fibrous thermal insulation comprising an intimate blend of A) 20 to 75% by weight of non-electrically conductive carbonaceous fibers derived from oxidized polyacrylonitrile fibers for providing fire resistance and B) hollow styrenic fibers having about 6 to 12 crazes, said carbonaceous fibers have an LOI value greater than 40, a percent char value greater than 65, a carbon content of less than 85 percent and a thermal conductivity less than 1 BTU ft/hr ft.sup.2 .degree. F.
- 11. The insulation of claim 10 wherein said styrenic fibers have a fiber width of about 16 .mu.m to 30 .mu.m.
RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 554,778, filed Jul. 19, 1990, of Suh et al, entitled, "Stabilized and Carbonaceous Expanded Fibers".
US Referenced Citations (10)
Non-Patent Literature Citations (2)
Entry |
PCT WO86/06110, McCullough et al. Published Oct. 23, 1986. |
PCT WO89/03766, McCullough et al Published May 5, 1989. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
554778 |
Jul 1990 |
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