Erasable writing ink composition
US5621021A · kind A · utility
11Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1993 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Jan 28, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides an erasable writing ink composition which can be erased with an eraser after writing. The erasable writing ink composition of the present invention comprises 2 to 50% by weight of a resin selected from the group consisting of styrene-butadiene rubber and an acrylonitrile-butadiene rubber having a film-forming temperature of 0.degree. C. or less or a glass transition temperature of 0.degree. C. or less, 0 to 5% by weight of a surface active agent, 1 to 50% by weight of colored spherical fine particles and 20 to 97% by weight of water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.