Phthalonitrile prepolymer as high temperature sizing material fo

Details Phthalonitrile prepolymer as high temperature sizing material fo Phthalonitrile prepolymer as high temperature sizing material fo

1993-06-28

1995-02-14

Bell, James J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

4273855, 4273935, 4274071, 4274121, 428375, 4284735, 428902, 523200, B32B 2734

Patent

active

053894413

ABSTRACT:
Sized fibers, for use as reinforcements in high temperature polymeric comites, are prepared by coating the outside surface of the fibers with an amorphous, B-stage bisphthalonitrile prepolymer. The prepolymer may be prepared by curing a bisphthalonitrile monomer with an organic amine, an aromatic organic acid, a mineral acid, a Lewis acid or a salt of any of the above. Then, the fibers are coated by passage through an organic solution of the prepolymer. Either before or after completely curing the prepolymer coating on the fibers, the coated fibers are covered with a resin, for example, by passage through a solution or melt of a polyimide or bisphthalonitrile resin. If the phthalonitrile coating was incompletely cured prior to covering the phthalonitrile-coated fiber with the resin, the heat during the subsequent cure of the resin also completely cures the phthalonitrile coating. The resulting composite has excellent high temperature properties. In a preferred embodiment, the coated fibers are used to form a prepreg for usage in composite fabrication.

REFERENCES:
patent: 4408035 (1983-10-01), Keller
patent: 4587325 (1986-05-01), Keller
patent: 4619986 (1986-10-01), Keller
patent: 5003078 (1991-03-01), Keller
patent: 5004801 (1991-04-01), Keller et al.
patent: 5159054 (1992-10-01), Keller

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