Hot-foamable, thermosetting epoxy resin mixture

Details Hot-foamable, thermosetting epoxy resin mixture Hot-foamable, thermosetting epoxy resin mixture

1988-05-05

1989-01-17

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 95, 521121, 521135, C08J 910

Patent

active

047988487

ABSTRACT:
Cured foams with a high degree of closed cellular structure, good stability under prolonged heat exposure and good compressive strength can be produced from a hot-foamable, thermosetting epoxy resin mixture containing (a) an epoxy resin or a mixture of epoxy resins with an average epoxide content of 4.4 to 5.0 equivalents/kg and an average epoxide functionality of more than 2.0, (b) a novolak with a hydroxyl equivalent weight of 90 to 120, 0.8 to 0.95 hydroxyl equivalents of component (b) being present in the epoxy resin mixture per 1 epoxide equivalent of component (a), (c) 1.0 to 1% by weight, based on the amount of components (a) and (b), of a curing accelerator, (d) 0.5 to 10% by weight, based on the amount of components (a) and (b), of a blowing agent which splits off nitrogen above 100.degree. C. with decomposition, (e) 0.3 to 1% by weight, based on the total amount of the epoxy resin mixture, of an emulsifier, and if appropriate (f) foam modifiers.

REFERENCES:
patent: 3615975 (1971-10-01), Gillern et al.
patent: 3629163 (1971-12-01), Nolken
patent: 3649572 (1972-03-01), Hairston et al.
patent: 3825506 (1974-07-01), Carter
patent: 3941725 (1974-09-01), Schmitter et al.
patent: 4157428 (1979-06-01), Hammer

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