Production process of multivalent metal-modified salicylic acid/styrene resin, color-developing agent using the resin and suited for use in pressure-sensitive copying paper sheet and pressure-sensitive copying paper unit employing the agent
US4952648A · kind A · utility
6Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed herein are novel multivalent metal-modified salicyclic acid resins useful as color-developing agents for pressure-sensitive copying paper. They can each be produced by causing a salicyclic acid ester and a styrene derivative to undergo a Friedel-Crafts reaction in the presence of a strong acid catalyst, hydrolyzing the resulting salicylic acid ester resin, and then reacting the thus-obtained salicyclic acid resin with a multivalent metal salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.