CARBIDE, NITRIDE AND SILICIDE REINFORCING AGENTS FOR LASER ABSORPTION Russian patent published in 2022 - IPC B23K26/18 B41M5/28 B25H7/00 C09D7/61 C08K3/28 C08K3/14 C08K3/10 C08K3/01 C08K3/34 

FIELD: chemistry.

SUBSTANCE: invention relates to a marking composition designed to form marks or signs on substrate after laser irradiation, and to a method for laser marking substrate. The composition contains reinforcing agents for laser marking, such as nitrides, carbides, silicides or combinations thereof. The agent reinforcing the absorption of laser radiation is selected from a group consisting of: FeMn, (Co)Mo, CaSi, Cu₅Si, FeSi, Fe₅Si₂, MgFeSi, MnSi₂, MoSi₂, Ni₂Si, TiSi₂, ZrSi₂, WSi₂, YSi, Al₄C₃, boron carbide (B₄C), CaC₂, Fe₃C, Fe₇C₃, Fe₂C, LaC₂, Mg₂C, Mg₂C₃, MoC, Mo₂C, Mo₃C₂, Ta₄C₃, YC₂, AlN, BN, Fe₂N, Fe₃N, Fe₄N, Fe₇N₃, Fe₁₆N₂, MoN, Mo₂N, Si₃N₄, TiN, W₂N, WN, WN₂, ZrN and combinations thereof. After placing the marking composition on substrate and exposure to laser radiation, the marking composition forms a mark on substrate that has a negative dark contrast value of at least -1, compared to the mark made by the marking composition without a reinforcing agent.

EFFECT: obtaining a marking composition.

6 cl, 20 dwg, 11 tbl