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MATÉRIAUX POUVANT ETRE MARQUÉS AU LASER, COMPRENANT UN COMPOSANT POLYAMIDE ET DU NOIR DE CARBONE
MATÉRIAUX POUVANT ETRE MARQUÉS AU LASER, COMPRENANT UN COMPOSANT POLYAMIDE ET DU NOIR DE CARBONE
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摘要
The present invention relates to a laser markable polymer composite, comprising (a) a polyamide component as the matrix, and (b) carbon black as a laser-sensitive additive, wherein the polyamide component consists of based on the total weight thereof at least 50 wt% a polyamide selected from a linear aliphatic polyamide (a1) or (a2), a cycloaliphatic polyamide (a3), a semi-aromatic polyamide (a4) or (a5) and the compound thereof as well as the copolymer thereof, the carbon black is present in an amount of 50-300 ppm, based on the total weight of the polymer composite. The present invention results in better chemical resistance than conventional polycarbonate as the matrix in addition to desired quality (that is to say sharpness and resolution) of laser marking. The present invention also relates to the use of, and the moulded article made of the laser markable polymer composite as well as a layered structure comprising at least one layer made of the laser markable polymer composite and a security and/or valuable document comprising the layered structure.
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