Method for making a prepreg of an epoxy resin impregnated fiberg

Details Method for making a prepreg of an epoxy resin impregnated fiberg Method for making a prepreg of an epoxy resin impregnated fiberg

1992-08-24

1994-05-17

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Heating or drying

B05D 302

Patent

active

053126513

ABSTRACT:
A method for making a prepreg of an epoxy resin impregnated fiberglass substrate for preparing an electrical laminate provides prolonged shelf life of the prepreg, improved adhesive strength between the prepregs or between a metal foil and the prepreg, and also excellent heat resistance for soldering of the laminate, etc. The method of the present invention comprises preparing a resin mixture of an epoxy resin having at least two epoxy groups, a curing agent consisting of dicyandiamide and a halogenated diaminodiphenylmethane derivative of the formula ##STR1## (wherein R1 stands for a hydrogen atom, or a lower alkyl group, R2 stands for a halogen atom, or a lower alkyl group, each of R3 and R4 stands for a lower alkyl group, a hydrogen or halogen atom, and also at least one of R3 and R4 stands for a halogen atom), and a catalyst for effecting the reaction between the epoxy resin and the curing agent, diluting the resin mixture in a solvent to form a resin varnish, impregnating a fiberglass substrate with the resin varnish, and then drying to partially cure the resin impregnated substrate, so that a B-stage cured prepreg is formed.

REFERENCES:
patent: 4559395 (1985-12-01), Jackson
patent: 4868059 (1989-09-01), Walker et al.
patent: 4954603 (1990-09-01), Takata et al.
patent: 4960634 (1990-10-01), Boyko et al.
patent: 5104691 (1992-04-01), Edwards et al.
patent: 5143756 (1992-09-01), Cibulsky et al.
JP 61-209221, Sep. 1986, Shimamoto et al., English Translation.

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