Transparent coating for laser marking
US6210472A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1999 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Apr 8, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L5/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.