Reaction Steps
Examples of these cyanate ester compounds include 1,3- or 1,4-dicyanato benzene, 1,3,5-tricyanatobenzene, 1,3-, 1,4-, 1,6-, 1,8-, 2,6- or 2,7-dicyanate naphthalene, 1,3,6-tricyanato naphthalene, 4,4'-dicyanato biphenyl, bis(4-dicyanatophenyl)methane, bis(3,5-dimethyl-4-dicyanatophenyl)methane, 2,2-bis(4-cyanatophenyl)propane, 2,2-bis(3,5-dichloro-4-cyanatophenyl)propane, 2,2-bis(3,5-dibrome-4-cyanatophenyl)propane, 2,2-bis(3,5-dimethyl-4-cyanatophenyl)propane, bis(4-cyanatophenyl)ether, bis(4-cyanatophenyl)thioether, bis(4-cyanatophenyl)sulfone, tris(4-cyanatophenyl)phosphite, tris(4-cyanatophenyl)phosphate, polyfunctional novolak-cyanates obtained by reacting novolak with a cyanogen halide (U.S. Pat. Nos. 4,022,755 and 3,448,079), polyfunctional polycarbonatecyanates obtained by reacting an OH-terminated polycarbonate oligomer with a cyanogen halide (U.S. Pat. No. 4,026,913 and DEP 2,611,796) and styryl pyridine cyanate obtained by reacting a cyanogen halide with a poly-hydroxy-styryl-pyridine obtained by reacting a hydroxy benzaldehyde with an alkyl-substituted pyridine (U.S. Pat. No. 4,578,439). Other suitable cyanate ester compounds are given in U.S. Pat. Nos. 3,553,244; 3,755,402; 3,740,348; 3,595,900; 3,694,410 and 4,116,946, GBP 1,305,967 and 1,060,933, DEP 1,190,184 and 1,195,764. These U.S. Patents and D.E. Patents are incorporated herein by way of reference.
