Process for the preparation of organotitanium compounds and their use in cathodically depositable electrodeposition coating materials

摘要

A process for the preparation of organotitanium compounds and to their use as crosslinking catalysts in cathodically depositable electro-deposition coating materials is described. The organotitanium compounds are obtained by first carrying out partial transesterification of tetraalkyl orthotitanates with alkylene glycols which are capable of forming chelates, and then completing the transesterification of the resulting intermediate with hydroxyl compounds based on modified mono- and/or diepoxide compounds. Cathodically depositable electrodeposition coating materials which contain the organotitanium compounds prepared in accordance with the invention provide, after curing in a temperature range from 160 DEG to 180 DEG C., coating films having excellent stability and the like properties, without the need to use additional crosslinking catalysts based on heavy metals such as lead or tin.