To obtain the subject molding material capable of manifesting the effect on the retardation of gelling and the improvement of preservation stability, etc., and having excellent moldability and reliability by compounding a vinyl ester resin with a specific initiator and an inhibitor.
The molding material consists essentially of (A) a vinyl ester resin, (B) a radical polymerization initiator (e.g. an aromatic peroxide), (C) a polymerization initiator containing at least one N-O bond in the structure (preferably an oxime-based compound, or nitroxide-based compound) and (D) an inorganic filter, and not less than 20 wt.% of the component A is a novolak- based vinyl ester resin. The amounts of the respective compounded ingredients are preferably 0.05-10 pts.wt. component B, 0.001-10 pts.wt. component C and 100-2,000 pts.wt. component D based on 100 pts.wt. component A. A transfer molding method and an injection molding method are desirable as the molding method of the molding material. As a result, high productivity of an electronic part device is expected by using the molding material.
Furusawa, Fumio
Hirakura, Hiroaki
Hirayama, Takao
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