Laser marking and printing ink therefor
US5413629A · kind A · utility
62Cited by
4References
23Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 29, 1993 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | Nov 29, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/037
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A non-destructive laser marking method including irradiating laser light on a thermosensitive color-forming layer formed by printing with a printing ink containing a leuco dye as a color former and an acidic substance as a color developer, and at least one background color formation inhibitor selected from the group consisting of a water-soluble amino acid, an ammonium salt of an inorganic acid, a pH buffer, and water. Laser marking can be achieved with low energy and at high speed while minimizing background color formation to provide a high-contrast color image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.