Laser markable coating
US6478861B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2000 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Mar 30, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/267
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a transparent or colorless coating comprising a heat responsive material that increases in opacity when exposed to heat. An example of a heat responsive material is an inorganic compound or an organic resin. The present invention further provides a coating composition comprising a carrier and a heat responsive material. The coating can further include additives such as an adhesion promoter, a defoamer, a crosslinking agent, a plasticizer, a humectant, a pH adjuster, a biocide, a co-solvent, a surface tension modifier, and/or a combination thereof. 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, e.g., a laser, to create the mark. The present invention further provides substrates suitable for laser marking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.