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Flame retardant B-staged epoxy resin prepregs and laminates made therefrom
Flame retardant B-staged epoxy resin prepregs and laminates made therefrom
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机译:阻燃B级环氧树脂预浸料和由其制成的层压板
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摘要
A prepreg useful in flame resistant copper clad printed circuit boards is made by impregnating a porous substrate with an impregnant containing: either a prebrominated epoxy resin or a mixture of a non-halogenated epoxy resin and flame retarding additive containing bromine, and phenolic hydroxyl groups. A phenolic novolac oligomer having an average of over 2. 5 phenolic hydroxyl groups per oligomeric unit is used as curing agent. Optionally, a suitable catalyst may be included. The impregnated substrate is heated to cure or advance the resin to the "B"-stage.
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