Carbonless copying paper
US4003589A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1973 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Oct 4, 1993 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/1655
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye which gives color under acidic conditions and a mineral oil, said dye solution including as solvent one or more of alkylnaphthalenes of the general formula ##STR1## WHEREIN R represents C.sub.1 -C.sub.4 alkyl group, n is an integer of 1-4, and R may be the same or different when n is 2-4, the total number of carbon atoms in R's being 4-6. Such carbonless copying papers exhibit excellent color development and are non-toxic and biodegradable, thus causing no environmental pollution when they are discarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.