| 摘要 |
NEW MATERIAL:The compound of formula (R is 9-30C alkyl). EXAMPLE:2,4-Dihydroxybenzoic acid docosyl ester. USE:A color-developing agent for heat-sensitive recording paper. It gives a heat- sensitive recording paper having high color density and free from spontaneous color development before heat-treatment. Heat-sensitive recording paper is useful in wide fields such as medical or industrial recording instrument, terminal of computer or communication, facsimile, etc. PREPARATION:The compound of formula can be produced by reacting 2,4- dihydroxybenzoic acid and an alcohol in the presence of an acidic catalyst (e.g. hydrochloric acid) in a solvent such as benzene under heat-refluxing. |
