Transparent coating for laser marking
AssigneeMarconi Data Systems Inc.
InventorsWing Sum Vincent Kwan, Yoshikazu Mizobuchi
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Abstract
The present invention provides a transparent coating comprising a resin and a heat responsive material that increases in opacity when exposed to heat. Preferably, the transparent coating is free or substantially free of a pigment or dye. An example of a heat responsive material is a carbohydrate. The present invention further provides a coating composition comprising a solvent, a resin, and a heat responsive material that increases in opacity when exposed to heat. The present invention further provides a method for creating a mark on a substrate comprising providing to the substrate the transparent coating to obtain a coated substrate and exposing a selected area of the coated substrate to heat to create the mark. The substrates can be marked with a laser.
Claims39
A transparent coating comprising a resin and a heat responsive material that increases in opacity when exposed to heat.
A coating composition comprising a solvent, a resin, and a heat responsive material that increases in opacity when exposed to heat, wherein said coating composition is capable of forming a transparent coating.
A transparent coating comprising a resin and a heat responsive material that increases in opacity when exposed to heat, wherein the heat responsive material is a sugar or sugar derivative.
A coating composition comprising a solvent, a resin, and a sugar or sugar derivative that increases in opacity when exposed to heat, wherein said coating composition is capable of forming a transparent coating.
Dependencies are inferred from the claim text.