Meta-halogenated phenols are generally known to be more chemically and thermally stable than their ortho-or para-halogenated counterparts. A reactive intermediate, produced by the bromination of 2,4,6-trimethylphenoI is being used as an alkylating agent to incorporate this stable m-bromophenol moiety into varieties of organic compounds and polymers. In electronic encapsulation applications, epoxy derivatives of novolacs containing m-bromophenol have exhibited superior hydrolytic and thermal stability as compared with the conventional tetrabromo bisphenol-A epoxies which are ortho-brominated phenolics. The m-bromophenol moiety contributes to the extended device reliability while meeting flame retardency requirements as well. ZUSAMMENFASSUNG:Meta-halogenierte Phenole sind bekanntermaoen chemisch und thermisch stabiler als ihre ortho-oder para-halogenierten Analoga. Die Verwendung eines reaktiven Zwischenproduktes, hergestellt durch Bromierung von 2,4,6-Trimethylphenol, als Alkylierungsmittel fur den Einbau der stabilen m-Bromphenol-Einheit in verschiedene organische Substanzen und Polymere wird beschrieben. Bei der Anwendung als Verkapselungsmaterialien fur elektronische Bauteile zeigten sich Epoxid-Derivate von Novolaken mit m-Bromphenol-Einheiten beziiglich hydrolytischer und thermischer Stabilitat den konventionellen Tetrabrombisphenol-A-Epoxidharzen, die ortho-und para-bromiert sind, uberlegen. Die m-Bromphenolgruppe verbessert die Bauteilzuverlassigkeit bei gleichzeitiger Erfullung der Anforderungen an das Brandverhalten.
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