Laser absorbing compounds
View Patent ↗Various laser marking compositions and related methods are described. The laser marking compositions include a molybdenum metal complex, a tungsten metal complex, or combinations thereof. Marks or other indicia formed on a substrate using the compositions and methods exhibit increased contrast and improved substrate bonding.
1. A marking composition for forming a mark on a substrate upon being irradiated with a laser, the composition comprising:
a vehicle; and
a laser absorber comprising a eutectic composition comprising MoO 3 and at least one selected from the group consisting of WO 3 , Li 2 O, Na 2 O, K 2 O, and combinations thereof.
2. A marking composition for forming a mark on a substrate upon being irradiated with a laser, the composition comprising:
a vehicle; and
a laser absorber comprising a eutectic composition comprising WO 3 and at least one selected from the group consisting of MoO 3 , Li 2 O, Na 2 O, K 2 O, and combinations thereof.
3. A marking composition for forming a mark on a substrate upon being irradiated with a laser, the composition comprising:
a vehicle; and
a laser absorber comprising a eutectic composition comprising MoO 3 and at least one selected from the group consisting of Li 2 O, Na 2 O, K 2 O, and combinations thereof.
4. A marking composition for forming a mark on a substrate upon being irradiated with a laser, the composition comprising:
a vehicle; and
a laser absorber comprising a eutectic composition comprising WO 3 and at least one selected from the group consisting of Li 2 O, Na 2 O, K 2 O, and combinations thereof.
5. The marking composition according to claim 2 , wherein the composition further comprises MoO 3 .
6. The marking composition according to claim 3 , wherein the composition further comprises WO 3 .
7. The marking composition of claim 1 , wherein the laser absorber comprises a eutectic composition comprising Li 2 MoO 4 and K 2 MoO 4 .
8. A marking composition for forming a mark on a substrate upon being irradiated with a laser, the composition comprising:
a vehicle; and
a laser absorber comprising a eutectic composition comprising tungsten oxide and at least one selected from the group consisting of SrO, Nb 2 O 5 , and combinations thereof.
9. The marking composition of claim 8 , wherein the laser absorber includes oxides selected from the group consisting of
SrO+Sr 3 WO 6 ,
Sr 3 WO 6 +SrWO 4 ,
SrWO 4 +WO 3 ,
Nb 2 O 5 +WO 3 and
combinations of the foregoing.
10. A method of forming a mark on a substrate, the method comprising:
applying a marking composition to a substrate, the marking composition including:
a vehicle; and
a laser absorber comprising a composition comprising MoO 3 and at least one selected from the group consisting of WO 3 , Li 2 O, Na 2 O, K 2 O, and combinations thereof; and
exposing the marking composition to a laser such that at least a portion of the marking composition increases in temperature, adheres to the substrate, and forms a mark on the substrate that has a luminance, color, and/or degree of opacity that contrasts from the substrate.
11. A method of forming a mark on a substrate, the method comprising:
applying a marking composition to a substrate, the marking composition including:
a vehicle; and
a laser absorber comprising a eutectic composition comprising WO 3 and at least one selected from the group consisting of MoO 3 , Li 2 O, Na 2 O, K 2 O, and combinations thereof; and
exposing the marking composition to a laser such that at least a portion of the marking composition increases in temperature, adheres to the substrate, and forms a mark on the substrate that has a luminance, color, and/or degree of opacity that contrasts from the substrate.
12. A method of forming a mark on a substrate, the method comprising:
applying a marking composition to a substrate, the marking composition including:
a vehicle; and
a laser absorber comprising a eutectic composition comprising MoO 3 and at least one selected from the group consisting of Li 2 O, Na 2 O, K 2 O, and combinations thereof; and
exposing the marking composition to a laser such that at least a portion of the marking composition increases in temperature, adheres to the substrate, and forms a mark on the substrate that has a luminance, color, and/or degree of opacity that contrasts from the substrate.
13. A method of forming a mark on a substrate, the method comprising:
applying a marking composition to a substrate, the marking composition including:
a vehicle; and
a laser absorber comprising a eutectic composition comprising WO 3 and at least one selected from the group consisting of Li 2 O, Na 2 O, K 2 O, and combinations thereof; and
exposing the marking composition to a laser such that at least a portion of the marking composition increases in temperature, adheres to the substrate, and forms a mark on the substrate that has a luminance, color, and/or degree of opacity that contrasts from the substrate.
14. The method of claim 12 wherein the eutectic composition further comprises WO 3 .
15. The method of claim 13 wherein the eutectic composition further comprises MoO 3 .
16. The method of claim 10 , wherein the laser absorber comprises a eutectic composition comprising Li 2 MoO 4 and K 2 MoO 4 .
17. A method of forming a mark on a substrate, the method comprising:
applying a marking composition to a substrate, the marking composition including:
a vehicle; and
a laser absorber comprising tungsten oxide and at least one selected from the group consisting of SrO, Nb 2 O 5 , and combinations thereof; and
exposing the marking composition to a laser such that at least a portion of the marking composition increases in temperature, adheres to the substrate, and forms a mark on the substrate that has a luminance, color, and/or degree of opacity that contrasts from the substrate.
18. The method of claim 17 , wherein the laser absorber includes oxides selected from the group consisting of
SrO+Sr 3 WO 6 ,
Sr 3 WO 6 +SrWO 4 ,
SrWO 4 +WO 3 ,
Nb 2 O 5 +WO 3 and
combinations of the foregoing.