| 摘要 |
PURPOSE:To provide a pressure sensitive recording paper, in which dirty coloring is difficult to occur and only necessary parts can be made indelible, by causing the developer layer of said paper to have parts differing from each other in the film strength. CONSTITUTION:A new developer layer having a partially low film strength, that is, being easy to come off is provided on a developer layer having a film strength causing no trouble normally. The factor controlling the film strength of a developing ink composed of developer, pigment, binder and solvent is a 'pigment/binder' ratio, and said ratio is preferably 0.7 or more, and most preferably 1.5-2.5. Commercially available developer sheets for pressure sensitive recording paper (middle lamella paper and lower lamella paper) can be used as the developer layer with a high film strength, on which said developing ink with a low film strength is printed and applied. Commercial upper lamella paper and middle lamella paper can be used as color former-containing microcapsule applied sheets, in which said developer sheets are written repeatedly and color image is formed on the back (microcapsule face) to enable making said sheets indelible. |
