Paper making and fiber liberation – Processes and products – Plural fiber containing
Reexamination Certificate
2000-01-21
2001-11-06
Michl, Paul R. (Department: 1714)
Paper making and fiber liberation
Processes and products
Plural fiber containing
C162S152000, C162S157200
Reexamination Certificate
active
06312561
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to aramid and mica paper compositions and to a process for using such compositions as flame barriers.
2. Description of Related Art
U.S. Pat. No. 3,080,272, issued Mar. 5, 1963 on the application of D. E. Jackson discloses a composition including fibrids, such as meta-aramid fibrids, and flake-like materials, such as mica for use decorative panels, electrical insulation, or molded shapes.
U.S. Pat. No. 5,393,872, issued Feb. 28, 1995 on the application of Shinoki et al. discloses the preparation of sheets made from meta-aramid fibrids and mica for electrical insulation.
BRIEF SUMMARY OF THE INVENTION
This invention relates to a flame barrier paper composition made from meta-aramid fibrids and mica. The composition is defined by its ability to slow the advance of a flame by exhibiting a burnthrough time of at least 240 seconds under conditions of an FAA Burnthrough Test Standard for Aircraft Insulation at a temperature of at least 1150° C. (2100° F.), as will be described herein.
The invention also relates to a process for slowing the advance of a flame comprising the steps of placing the composition in a path of the flame and holding it there to absorb and reflect heat from the flame.
REFERENCES:
patent: 3080272 (1963-03-01), Jackson
patent: 4060451 (1977-11-01), Uchiyama et al.
patent: 4286013 (1981-08-01), Daroga et al.
patent: 5266395 (1993-11-01), Yamashita
patent: 5393872 (1995-02-01), Shinoki et al.
patent: 5830319 (1998-11-01), Landin
patent: 6166114 (2000-12-01), Cosstick
patent: 0 373 137 A2 A3 (1990-06-01), None
patent: 1129097 A (1968-10-01), None
patent: 57 170413 A (1982-10-01), None
patent: WO 00/32388 A2 (2000-06-01), None
PCT International Search Report.
Forsten Herman Hans
Khan Sami
E. I. Du Pont de Nemours and Company
Michl Paul R.
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