| abstract |
The invention relates to a moulding material for the production of fire-retarding objects, comprising a matrix made of a thermoplastic material and a particle-shaped pigment which is dispersed therein. The invention is characterised in that the pigment is light-sensitive, the colour thereof changes under the influence of laser and that the pigment is a reaction product at least between one halogen free non-flammable organic nitrogenous base, and comprises (i) at least one mixed salt comprising at least two cations which are different from each other and/or (ii) a mixture of salt-type compounds which can be converted by heating into at least one salt-type compound comprising at least two different cations, such as (I). According to the invention, in the variants (i) and (ii), at least one of the cations is selected from the group (A) comprising the elements Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ag, Sn, Sb, La, Pr, Ta, W and Ce and at least one additional cation is selected from the group (B) comprising the elements of the 3<SUP>rd</SUP> to 6<SUP>th</SUP> period of the II. and III. main groups, of the 5<SUP>th</SUP> to 6<SUP>th</SUP> periods of the IV main group in addition to the 4<SUP>th</SUP> to 5<SUP>th</SUP> periods of the III. to VIII. auxiliary group and the lanthanides of the periodic table. |