naphthalene anthracene pyrene or the like the aromatic radical ar may also be derived from a polynuclear aromatic hydrocarbon in which at least two aromatic rings are attached to each other through a bridging group also included are aromatic radicals derived from novolac type phenolic resins u2014 i e cyanate esters of these phenolic resins the aromatic radical ar may also contain further ring attached non reactive substituents examples of such cyanate esters include for instance 1 3 dicyanatobenzene 1 4 dicyanatobenzene 1 3 5 tricyanatobenzene 1 3 1 4 1 6 1 8 2 6 or 2 7 dicyanatonaphthalene 1 3 6 tricyanatonaphthalene 4 4 u2032 dicyanato biphenyl bis 4 cyanatophenyl methane and 3 3 u2032 5 5 u2032 tetramethyl bis 4 cyanatophenyl methane 2 2 bis 3 5 dichloro 4 cyanatophenyl propane 2 2 bis 3 5 dibromo 4 dicyanatophenyl propane bis 4 cyanatophenyl ether bis 4 cyanatophenyl sulfide 2 2 bis 4 cyanatophenyl propane tris 4 cyanatophenyl phosphite tris 4 cyanatophenyl phosphate bis 3 chloro 4 cyanatophenyl methane cyanated novolac 1 3 bis 4 cyanatophenyl 1 methylethylidene benzene and cyanated bisphenol terminated polycarbonate or other thermoplastic oligomer other cyanate esters include cyanates disclosed in u s pat nos 4 477 629 and 4 528 366 the disclosure of each of which is hereby expressly incorporated herein by reference the cyanate esters disclosed in u k pat no 1 305 702.