| abstract |
The present invention provides coating compositions for marking substrates, which comprises a color former, an amine salt of an organic metal compound, a binder, a solvent, and optionally additional components, wherein the amine salt of the organic metal compound is of formula (I) in which X is silicon or boron, and E and F are the same or different and are selected from the group consisting of a, b, c, d, e, f, g, h in which R 6 and R 7 are the same or different are hydrogen, C 1-4 -alkyl, C 1-4 -alkoxy, halogen, amino or carboxy, and for X=silicon o=1 and p=0, and R 1 is aryl, aralkyl or C 1-4 -alkyl, or o=1 and p=1, and R 1 and R 2 together form a one residue selected from the group consisting of a, b, c, d, e, f, g and h, and for X=boron o=0 and p=0, and R 3 , R 4 and R 5 are the same or different and are hydrogen, C 1-12 -alkyl, C 1-6 -hydroxyalkyl, allyl, aralkyl or arylsulfonyl, in which aralkyl or arylsulfonyl can be substituted with C 1-4 -alkyl, or R 3 and R 4 together with the nitrogen to which they are attached form a morpholino or piperidino ring. The present invention also provides a process for the preparation of the composition of the present invention, substrates coated with these compositions, a process for preparing coated substrates, a process for preparing a marked substrate using these compositions, a marked substrate obtainable by the latter process and amine salts of the organic metal compounds of formula I. |