| abstract |
The invention concerns a coupled aromatic compound represented by the formula (I): Ar-Y, wherein Ar is an aromatic moiety different from Y and Y is an aromatic moiety represented by one of the formulae (II), (III), (IV), (V), (VI) or (VII), wherein A is an aliphatic ring system bonded to the aromatic ring; Q is separately at each occurrence hydrogen, alkyl or inertly-substituted alkyl with proviso that the carbon atom bonded to the aromatic ring is a primary or secondary carbon atom. X is separately at each occurrence a halogen moiety, Z is a nitrogen- or chalcogen-containing moiety, and their preparation. The materials contain a moiety such as, for example, 4-oxy-3,5-dimethyl-2,6-dibromobenzyl which can impart a high degree of thermal and hydrolytic stability to the materials, for example, epoxy thermosets such as in electronic encapsulations. For example, when used in electronic encapsulation formulations, these materials can provide a substantial increase in electronic device reliability. Their preparation involves an alkylation of an aromatic ring, for example, such as a Friedel-Crafts alkylation with 4-bromomethyl-3,5-dibromo-2,6-dimethylphenol or with 4-hydroxymethyl-3,5-dibromo-2,6-dimethylphenol. |