Composition for laser marking
AssigneeGeneral Electric Company
InventorsAnne Ramlow, Terence John Lillie, Theodorus Lambertus Hoeks
Life of this patent
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Abstract
A resin composition having laser marking properties comprising a polycarbonate resin, an effective amount of a copper chromite having a spinel structure and up to 0.05% by weight of the total composition of carbon black, wherein said polycarbonate resin foams in laser struck areas to form light colored markings in the laser struck areas on a dark background.
Claims22
A resin composition having laser marking properties comprising a polycarbonate resin, a copper chromite having a spinel structure and up to about 0.05% by weight of the total composition of a carbon black, wherein said polycarbonate resin foams in laser struck areas to form light colored markings in the laser struck areas on a dark background.
A method of marking a polycarbonate composition by exposing the polycarbonate composition to laser radiation from an Nd:YAG laser, said composition comprises a polycarbonate resin, a copper chromitc having a spinel structure and up to about 0.05% by weight of a carbon black based on the composition, wherein said polycarbonate resin foams in laser struck areas to form light colored markings in the laser struck areas on the dark background coloration.
Dependencies are inferred from the claim text.