Copper salts for laser marking of thermoplastic compositions
First Claim
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1. A laser markable thermoplastic composition, comprising:
- (a) at least one thermoplastic resin composition suitable for laser marking; and
(b) at least one copper salt selected from the group consisting of copper phosphate, copper sulfate, and copper thiocyanate, wherein said copper salt is present in an amount sufficient to cause said laser markable thermoplastic con, position to absorb a laser light outside the visible spectrum such that the portion of said composition which absorbs said laser light has a visibly distinct and separately identifiable color.
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Abstract
A laser markable thermoplastic composition which contains a copper phosphate salt such as copper phosphate, copper sulfate, cupric hydroxide phosphate and copper thiocyanate. The copper phosphate salt is preferably added in an amount ranging from about 0.1 to 5 parts by weight and the copper phosphate salt preferably has a particle size less than 10 μm. The laser markable thermoplastic composition can be laser marked to provide a visibly distinct and separately identifiable region which preferably differs in overall color from the base material by a Delta E value of at least 10-20.
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Citations
17 Claims
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1. A laser markable thermoplastic composition, comprising:
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(a) at least one thermoplastic resin composition suitable for laser marking; and (b) at least one copper salt selected from the group consisting of copper phosphate, copper sulfate, and copper thiocyanate, wherein said copper salt is present in an amount sufficient to cause said laser markable thermoplastic con, position to absorb a laser light outside the visible spectrum such that the portion of said composition which absorbs said laser light has a visibly distinct and separately identifiable color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification