USE OF PHTHALOCYANINES AS MARKING SUBSTANCES FOR LIQUIDS, LIQUID CONTAINING PHTHALOCYANINES, METHOD FOR IDENTIFICATION OF LIQUIDS, PHTHALOCYANINES, PROCESS FOR THEPREPARATION THEREOF AND PHTHALODINITRILES AND IMINOAMINOISOINDOLINES AS INTERMEDIATES

摘要

Phthalocyanines of the formula (I) in which the symbols and indices have the meanings given in the description are suitable as marking substances for liquids, in particular mineral oils., (I)