| 摘要 |
PURPOSE:To obtain a colorless carbon paper having good storage stability from an upper paper having a developing agent layer containing a wax on its back side and a lower paper having a paint coat containing a dye precursor as a color developing substance on its surface. CONSTITUTION:An upper paper whose back side is provided with a developing agent layer formed by coating a solid (at ordinary temperature) fat containing a water-soluble inorganic metal salt and a compound with phenolic hydroxyl group in an emulsified, dispersed, or dissolved state and dissolving and dispersing in a wax is combined with a lower paper obtained by coating a colorless dye precursor on the surface of a base sheet in order to form a colorless carbon duplicate paper without micro capsules. Vaseline or lard is used as a waxy substance into which a water-soluble inorganic metal salt and a compound with phenolic hydroxyl group are to be dissolved and dispersed. The use of the water- soluble inorganic metal salt enables clear-cut, quick, and stable color images to be obtained in early period. |
