AbstractThe preparation of cyanate ester thermosetting resins by coreacting a fluorinated bisphenol A dicyanate (6F‐BADCY) monomer with a monofunctional reactive cyanate, namely, the dinonyl phenol cyanate (DNPC), is described in this paper. Our objective in this study was to modify the 6F‐BADCY system with reactive diluents of a nonpolar nature and produce matrix resins processable at FR‐4 epoxylike conditions. By introducing the monofunctional cyanate as a reactive diluent, it is expected that the molar crosslink density of the resulting network will be reduced. Highly branched triazine polymers will result from this approach. Dinonyl phenol cyanate was quantitatively synthesized by reacting dinonyl phenol with cyanogen bromide in the presence of triethyl