High molecular weight polytriazines of soluble polymeric N-cyano-isourea ethers
AssigneeBayer Aktiengesellschaft
InventorsRudolf Sundermann, Gunther Rottloff, Ernst Grigat
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Abstract
Polyfunctional aminophenols or amino(alkyl)phenols are converted with cyano halide in the presence of a base at temperatures below 65.degree. C into the corresponding aromatic cyanic acid esters containing cyanamide groups and thereafter at 65.degree. C to 150.degree. C into prepolymers which are soluble in organic solvents and highly stable in storage. The prepolymers may be converted into high molecular weight polymers of triazine structure by heating to 150.degree. C to 350.degree. C. The end products are insoluble in solvents and are infusible. The prepolymers may be used for the production coatings, shaped articles or laminates.
Claims2
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.degree. to 65.degree. C to thereby form the corresponding aromatic cyanic acid ester containing cyanamide groups;
- heating said ester at a temperature of from 65.degree. to 150.degree. C to thereby form a prepolymer soluble in organic solvents and heating said prepolymer at a temperature of from 150.degree. to 350.degree. C to form a high molecular weight polytriazine.
Dependencies are inferred from the claim text.