Erasable ink composition containing a waterborne polyurethane-urea derived from an aromatic amine dye monomer and marking instrument containing same
US5637638A · kind A · utility
24Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1995 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Aug 24, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An erasable ink composition comprising a waterborne polyurethane-urea containing dye moiety covalently bonded thereto. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.