Curing agent for polyepoxides and epoxy resins and composites cu

Details Curing agent for polyepoxides and epoxy resins and composites cu Curing agent for polyepoxides and epoxy resins and composites cu

1979-08-30

1981-01-13

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260326S, 260326N, 528117, 528118, 528322, C08K 706, C08G 5902, C07D20706

Patent

active

042448573

ABSTRACT:
A curing agent for a polyepoxide has the formula: ##STR1## wherein R.sub.1 is a divalent aryl radical such as phenylene and wherein R.sub.2 is a tetravalent aryl radical such as a tetravalent benzene radical. An epoxide is cured by admixture with the curing agent. The cured epoxy product retains the usual properties of cured epoxides and, in addition, has a high char residue after burning, on the order of 45% by weight. The high char residue is of value in preventing release to the atmosphere of carbon fibers from carbon fiber-epoxy resin composites in the event of burning of the composite.

REFERENCES:
patent: 3838101 (1974-09-01), Steele et al.
patent: 3897395 (1975-07-01), D'Alelio
patent: 3917643 (1975-11-01), Takekoshi et al.
patent: 4066631 (1977-01-01), Dimmig
patent: 4092297 (1978-05-01), Williams

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