Washable non-splatter ink
US4163738A · kind A · utility
5Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1978 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Mar 14, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A washable non-splatter ink for use in oscillographic type pen recorders is disclosed. The ink is characterized by being stable at room temperature for extended periods of time, thus not requiring refrigeration for the maintenance of stability. The ink contains a high molecular weight polyacrylamide rather than polyethylene oxide as a pituity agent to stop splatter of the ink at fast writing speeds. The polyacrylamide allows the use of washable acid dyes. The inclusion of an unsaturated alcohol, such as butyne diol acts to retard the oxidation of the pituity, thus stabilizing the pituity against aging degradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.