| 摘要 |
<p>This invention relates to an imaging composition for providing improvement in speed of image formation and quality of the image. Dark images or visibly colored images can be formed on various substrates without the use of carbon by methods which provide for the reaction of rosin soaps of nickel or iron with dye precursor metal chelating materials such as dithiooxamide chelating agents. These chelating agents operate to form colored complexes with the nickel or iron cations. A shortcoming of systems containing rosin soaps of nickel is the length of time required for an intense image to form after the reaction of nickel with dithiooxamide. Users of carbonless imaging systems generally prefer that such an image be formed in a shorter time. This invention provides a soap composition which comprises (1) at least one metal cation, e.g. nickel, which produces an image when reacted with a dye precursor which is a derivative of dithiooxamide, (2) at least one rosin soap, and (3) at least one metallic soap e.g. lithium stearate. The presence of the metallic soap results in a higher level of metal cation, i.e., nickel or iron, available for image formation, thus improving speed of image formation and image quality.</p> |
