Process for the production of high molecular weight (cyclo) aliphatic polyesters of carbonic acid with (cyclo) aliphatic glycols

摘要

Carbonates of formulae FORM:1067898/C2/1 FORM:1067898/C2/2 are made by passing phosgene into a mixture of 1,4-dimethylolcyclohexane and ethyl or methyl alcohol.ALSO:Polycarbonates are made by reacting (a) 1 mol of a dihydroxylated aliphatic or cycloaliphatic hydrocarbon containing 4-40 carbon atoms or a polyxyalkylene glycol containing 4-40 carbon atoms and 2-4 carbon atoms in each alkyleneoxy group with (b) 1.0-1.8 mols of a chloroformate of a C1-C4 aliphatic monohydric alcohol, and then removing volatile products from the reaction product and polycondensing it at 100-300 DEG C. In a modification the product which is polycondensed may be a product obtained by reacting a mixture of the dihydroxy compound and a C1-C4 aliphatic monohydric alcohol in a mol. ratio of 1 : 1.0 to 1 : 1.8 with phosgene at an initial temperature of 0-60 DEG C. and a final temperature of 70-150 DEG C. Polycondensation may be effected in the presence of a catalyst, e.g. an alcoholate, hydride or oxide of Li, Na, K, Ca or Mg, zinc oxide or a titanium alkoxide. Specified dihydroxy compounds are 1 : 4-butanediol, 1 : 6-hexanediol, 1 : 10-decanediol, a diol of formula C36H66(OH)2, 1 : 3- and 1 :4-cyclohexanediol, 1 :3- and 1 : 4-dimethylol cyclohexane and various polyethylene and polypropylene glycols.