Water based dye ink composition for free ink rollerball pen
US6037391A · kind A · utility
19Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1998 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Dec 10, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A water based dye ink composition for a free ink rollerball pen characterized in that white resin particles which are insoluble in an aqueous medium and have an average particle diameter of 100 to 1000 nm and a refractive index of 1.50 or more at 20.degree. C. are added to a water based ink composition for a writing instrument comprising a dye and an aqueous medium to thereby allow the visible color of the ink liquid to be approximate to the visible color of lines written on a sheet of white paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.