FIELD: chemistry.
SUBSTANCE: colouring composition includes a thermally activated acid generator and halochromic leuco dye. Thermally activated acid generator selected from the group consisting of salts of amines and organometallic compounds containing boron or silicon, and neutralized amine derivatives of polyalkyl naphthalene polysulfonic acid. The coated substrate also covers the thermoplastic polymer layer such that the dye composition is between the substrate and the thermoplastic polymer layer and/or in the thermoplastic polymer layer.
EFFECT: protecting the dye composition from discolouration during lamination by melt extrusion and increasing the impermeability of the substrate to liquids.
20 cl, 1 dwg, 3 tbl, 10 ex
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