Composition for laser marking
First Claim
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1. 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.
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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.
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Citations
22 Claims
- 1. 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.
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21. 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.
- View Dependent Claims (22)
Specification