| 摘要 |
The invention relates to a method for preparing an ester composition in which at least one phenolic ether group of a molecule is reacted with at least one haloformyl group of another molecule. Preferably the molecules contain on average substantially two phenolic ether- and/or haloformyl groups, e.g. they contain one phenolic ether group and one chloroformyl group. The phenolic ether group may be derived from a carboxylated, alkylated or arylated phenol of the class comprising hydroquinone, p,p'-bisphenol, 4- and 3-hydroxybenzoic acid, 3-propyl-4-hydroxy-benzoic acid, a dihydroxynaphthalene and 7-hydroxynaphthalene-carboxylic acid. The phenolic ether group is derived from a phenol and a hydrocarbyl radical of the class comprising isopropyl, 2-butyl, tert.-butyl, 2-pentyl, tert.-pentyl, allyl, benzyl and cycloalkyl containing 5-8 carbon atoms. A preferred compound to use is 4-isopropoxybenzoic acid. The molecule containing at least one haloformyl group may be a benzoylchloride, terephthaloylchloride, naphthaloylchloride, 2,6- and 2,7-naphthalene dicarbonylchloride and the diacylchlorides of aliphatic C4-C9 dicarboxylic acids. A number of diethers are claimed and also a novel poly(-hydroxycarbonate) ester with special endgroups. |
