Reference

Linear polyesters based on heterocyclic dicarboxylic acids

Linear polyesters based on heterocyclic dicarboxylic acids. Herzog, Hans; Buxbaum, Lothar; Kainmueller, Thomas; Habermeier, Juergen (Ciba-Geigy A.-G., Switz.). Ger. Offen. DE 2617184 4 Nov 1976, 22 pp. (German).Chemicals with cas numbers 34040-64-7 and 61422-16-0 also play role. (Germany). CODEN: GWXXBX. CLASS: IC: C08G063-68. PRIORITY: CH 75-5203 23 Apr 1975. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) Polyesters with relative viscosity 1.2-3.0 (1% soln. in a 1:1 phenol-tetrachloroethane mixt. at 30.degree.), a high glass transition temp., and improved tenacity are manufd. from 4,5-imidazolidinedione derivs., 1,4-butanediol and(or) ethylene glycol, benzenedicarboxylic acids, and, optionally, hydantoin derivs. Thus, a mixt. of di-Me terephthalate 4.5i, ethylene glycol 4.54, and 1,3-bis(4'-methoxycarbonylphenylmethyl)-2,2-dimethyl-4,5-imidazolidin edione 4.2kg contg. 0.01% Zn as Zn(OAc)2 and 0.04% Ge as Ge butylate was heated at 250.degree., under N, while distg. MeOH. The mixt. was polycondensed at 260.degree. and 0.2 torr to give a polyester [61422-23-9] with relative viscosity 1.78 and glass transition temp. 104.degree.. .