| 摘要 |
PURPOSE:To obtain developing ink containing a developer, oil capsule having specific particle diameter and ink medium as basic components and capable of providing pressure sensitive duplicating paper having good coloring property in printing, extremely reduced in lowering of initial coloring property with lapse of time. CONSTITUTION:The objective ink containing (A) electron acceptable developer such as acidic clay, phenol resin, polyhydric salt of aromatic carboxylic acid and zinc salt of 2,2-bisphenol sulfonic acid compound, (B) oil capsule having 1-50mum (preferably 2-10mum) average particle diameter and preferably consisting of a melamine-formalin resin film and (C) ink medium as basic components. As an example of the component C, a volatile medium such as ethanol is used in case of evaporation drying type ink and high boiling point medium such as ethylene glycol is used in case of penetration drying type ink. |
