Aqueous pigment ink composition for writing utensils
US5510397A · kind A · utility
12Cited by
0References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1994 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Apr 8, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S260/38
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous pigment ink composition for writing utensils is provided, which is capable of providing handwritings with good opacifying properties and exhibits little difference in whiteness between handwritings obtained immediately after writing and after drying. When the composition is applied to the inner stick type of writing utensils, an ink having good opacifying properties is passed out. The ink composition comprises, at least, an emulsion of styrene resin-based doughnut-shaped flat particles as a white opacifying agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.