Laser marking compositions and methods of making and using the same

Abstract

Compositions and methods of using and making the same for laser marking substrates such as metal and plastic are disclosed. A marking composition is applied to the surface of the substrate, followed by irradiation of a portion of the marking composition to form a durable marking on the substrate. The non-irradiated portion of the marking composition is then removed from the substrate. The marking compositions described herein can create markings of black, grey, or iridescent, grey markings. The marking composition can comprise silicates, such as hydrated magnesium silicate and be oxide-free. The marking composition can comprise silicates and a combination of bismuth oxide and molybdemum oxide. The marking composition can optionally be combined with a anionic or nonionic surfactant. The compositions and methods of using are useful to create durable marks of high resolution and contrast without damage to the substrate.

Dependencies are inferred from the claim text.