Polyurethane based inks for writing instruments
US6797748B2 · kind B2 · utility
4Cited by
38References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2001 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Jun 8, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A non-erasable ink composition suitable for use in writing instruments is described comprising an isocyanate five thermoplastic polyurethane resin, a colorant and an organic solvent. The ink composition may also include a second resin, plasticizers, antioxidants, corrosion inhibitors, lubricants, chemical dispersants, and surfactants. The inks of the present invention exhibit a smooth writing performance and non-seepage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.