High temperature, low oxidation stabilization of pitch fibers

Details High temperature, low oxidation stabilization of pitch fibers High temperature, low oxidation stabilization of pitch fibers

C - Chemistry, Metallurgy

10

G

C10G 3/00 (2006.01) C10C 1/00 (2006.01) C10C 3/00 (2006.01) D01F 9/145 (2006.01)

Patent

CA 2284254

The present invention provides a process for thermosetting pitch fibers in reduced times, at low concentrations of oxygen and at higher temperatures than previously possible. Additionally, the present invention provides a pitch fiber which has an oxygen diffusion rate to the center of the fiber which is competitive with the rate of oxidation at the fiber's surface. Further, the present invention provides a high density pitch fiber batt which thermosets without loss of fiber structure.

La présente invention concerne un processus qui permet de thermofixer des fibres de brai dans des laps de temps réduits, à des concentrations d'oxygène faibles et températures plus élevées qu'il n'était possible précédemment. La présente invention concerne en outre une fibre de brai présentant une vitesse de diffusion de l'oxygène au centre de la fibre qui est avantageuse par rapport à la vitesse d'oxydation à la surface de la fibre. La présente invention concerne enfin une nappe de fibre de brai de forte densité pouvant thermodurcir sans perte de structure fibreuse.

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