Laser-marking additive
AssigneeEMD Chemicals, Inc.
InventorsShane F. Dreher, Mark J. Tellefsen, Tammy E. Link
Life of this patent
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Abstract
The present invention relates to a laser marking additive, a precursor and method of laser-marking. The method can include exposing a substrate including a high luster bismuth oxychloride to a laser creating a laser-mark, with the proviso that the substrate is not an unsaturated polyester cross-linked with a styrene monomer.
Claims35
A laser marking additive, comprising:
- a plurality of particles having a thickness less than 100 nm and all dimensions less than 25 microns of at least one compound of the formula:
- MOCl
- where M is, independently, As, Sb, or Bi;
- or
- a compound of formula BiONO3, Bi2O2CO3, BiOOH, BiOF, BiOBr, BiOC3H5O7, Bi(C7H5O2)3, BiPO4, Bi2(SO4)3, Pb(OH)2.2PbCO3, or Pb(OH)2.PbCo3;
- wherein a lacquer drawdown comprising the additive has a luster index of greater than 50%.
A laser-markable precursor, comprising a pigmented substrate which is a polyolefin, a polyamide, a polyester, a polyester ester, a polyether ester, a polyphenylene ether, a polyacetal, a polybutylene terephthalate, a thermoplastic polyurethane, a polymethyl methacrylate, a polyvinyl acetal, a polystyrene, an acrylonitrile-butadiene-styrene, an acrylonitrile-styrene-acrylate, a polycarbonate, a polyether sulphone, a polyether ketone, a copolymer thereof, or a mixture thereof, with the proviso that the substrate is not an unsaturated polyester cross-linked with a styrene monomer, and wherein the pigment comprises a high luster bismuth oxychloride.
A laser-markable precursor, comprising a substrate of a polyolefin, a polyamide, a saturated polyester, a polyester ester, a polyether ester, a polyphenylene ether, a polyacetal, a polybutylene terephthalate, a thermoplastic polyurethane, a polymethyl methacrylate, a polyvinyl acetal, a polystyrene, an acrylonitrile-butadiene-styrene, an acrylonitrile-styrene-acrylate, a polycarbonate, a polyether sulphone, a polyether ketone, a copolymer thereof, or a mixture thereof, and a high luster bismuth oxychloride.
Dependencies are inferred from the claim text.