High molecular weight polytriazines of soluble polymeric N-cyano-isourea ethers

Claim 1

A process for producing a high molecular weight polytriazine which comprises reacting (1) a compound of the formula ##STR6## wherein R is a bond, alkylene having 1 to 9 carbon atoms or said alkylene substituted by phenyl or by alkyl having 1 to 4 carbon atoms; X is hydrogen, halogen, alkyl having 1 to 9 carbon atoms, ##STR7## or phenyl, or two X substituents together on adjacent carbon atoms of the phenylene moiety to which they are attached together from a hydrocarbon ring containing from 5 to 6 carbon atoms or together form in conjunction with O, S, N or P a 5 or 6-membered heterocyclic ring; A is ##STR8## alkylene having 1 to 9 carbon or said alkylene substituted by phenyl or by alkyl having 1 to 4 carbon atoms, a 5 or 6-membered cycloaliphatic or aromatic ring or a bond; n is 1, 2 or 3; m is 1, 2 or 3; a is 5-n when c is 1 and 6-m-n when c is 0; b is 5-m; c is 0 or 1 and d is 5-n in the presence of an inorganic base or a tertiary amine or (2) a phenolate of said formula with cyanogen halide in the presence of a catalytic amount of a tertiary amine at a temperature from -40° to 65° C to thereby form the corresponding aromatic cyanic acid ester containing cyanamide groups; heating said ester at a temperature of from 65° to 150° C to thereby form a prepolymer soluble in organic solvents and heating said prepolymer at a temperature of from 150° to 350° C to form a high molecular weight polytriazine.