Laser marking compositions and method
First Claim
Patent Images
1. A laser marking material comprising a mixture of:
- at least one marking pigment; and
bismuth trioxide as a fixing material.
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Abstract
Laser markable coatings include a marking pigment and a fixing material. The marking pigment may comprise titanium dioxide, zinc oxide, zinc sulfide or the like. The fixing material may comprise bismuth trioxide, antimony oxide and the like, and preferably has a melting temperature below 1,300° C. A preferred laser marking composition includes TiO2 and Bi2O3 in a weight ratio of about 1:1. After application to a substrate and laser irradiation, the fixing material stabilizes the resultant mark.
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Citations
40 Claims
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1. A laser marking material comprising a mixture of:
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at least one marking pigment; and
bismuth trioxide as a fixing material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A laser marking coating comprising:
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a liquid carrier; and
a laser marking material, wherein the laser marking material comprises;
at least one marking pigment; and
bismuth trioxide as a fixing material. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of marking a surface of a substrate comprising:
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applying a marking material comprising a marking pigment and a fixing material to the surface of the substrate with a thickness of from about 0.1 to about 300 microns; and
irradiating a portion of the marking material with at least one laser beam to adhere the irradiated marking material on the surface of the substrate and to form a permanent marking thereon comprising the marking pigment and the fixing material. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification