Composition for laser marking
First Claim
1. A resin composition having laser marking properties with the CO2 laser with radiation at 10600 nm comprises a polyester thermoplastic resin, a sufficient amount of dark pigment for forming a dark background coloration, from about 1 to about 5 percent of said composition comprising a mica material for absorbing said laser radiation, and an effective amount of hydrated zinc phosphate containing wherein said zinc phosphate decomposes in laser struck areas to release said hydrated water whereby light colored markings in laser struck areas are obtained on said dark background coloration.
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Accused Products
Abstract
A resin composition having laser marking properties with the CO2 laser with radiation at 10600 nm comprises a polyester thermoplastic resin, a sufficient amount of dark pigment for forming a dark background coloration, a mica material for absorbing said laser radiation, and an effective amount of a hydrated metal phosphate containing water of crystallization wherein said metal phosphate decomposes in laser struck areas to release said hydrated water whereby light colored markings in laser struck areas are obtained on said dark background coloration.
59 Citations
12 Claims
- 1. A resin composition having laser marking properties with the CO2 laser with radiation at 10600 nm comprises a polyester thermoplastic resin, a sufficient amount of dark pigment for forming a dark background coloration, from about 1 to about 5 percent of said composition comprising a mica material for absorbing said laser radiation, and an effective amount of hydrated zinc phosphate containing wherein said zinc phosphate decomposes in laser struck areas to release said hydrated water whereby light colored markings in laser struck areas are obtained on said dark background coloration.
- 8. A molded article having laser radiated marked surface portions, said article comprises a polyester thermoplastic resin, a sufficient amount of dark pigment for forming a dark background coloration, from about 1 to about 5 percent of said composition comprising a mica material for absorbing said laser radiation, and an effective amount of zinc phosphate containing water of crystallization wherein said zinc phosphate decomposes in laser struck areas to release said water of crystallization whereby light colored markings in laser struck areas are obtained on said dark background coloration.
Specification