| 摘要 |
A process for preparing a polytriazine is claimed which consists of contacting, at a temp. of 20-200 (pref. 80-180) deg.C: (i) an aromatic polycyanate of formula Ar-(OCN)n, where Ar = aromatic or aromatic radical interrupted by one or more bridge members, and n = 1-7; with (ii) a catalytic amt. (pref. 0.001-5 wt.%) of a Co salt of a 6-20C carboxylic acid (pref. Co octoate or naphthenate). The polycyanate is pref. a cpd. of either formula (I) or (II) where R = H, halogen, 1-20C alkyl, phenyl, 1-4C alkoxy, 1-4C alkoxy carbonyl or 2 adjacent R on the same nucleus form a 5-6-membered carbo- or heterocyclic ring; R' = R or the gp. (III); A = double bond, 1-20C alkylene opt. substd. by 1-4C alkyl or phenyl, cycloaliphatic or aromatic 5-6-membered ring, SO2, carbonyl dioxide or carbonyl; a = 1.5 when e is at least 1 or 2-5 when e = 0; b = 5-a when e is at least 1 and 6-(a+d) when e = 0; c = 5-d; d = 0-5; e = 0-3 and a + d = 2-5; E = aromatic; B = 7-20C polycyclic aliphatic; D = any non-active H-contg. substituent; q, r, s = 0-3; q+r+s is at least 2; t = 0-4; x = 0-5. |
