| 摘要 |
In copying paper for use in a pressure-sensitive copying system of the kind in which copying is effected by reacting together a colour-former and a colour-reactant, the colour-reactant is formed by fine particles of oil-absorptive, inorganic, mineral material, the particles being individually coated, at least in part, with an organic, acidic, oil-soluble polymer containing uncombined phenolic hydroxyl groups, said polymer being reactive with the colour-former to develop it to the coloured form. The polymer may be a phenol/formaldehyde or a phenol/acetylene polymer and the mineral particles may consist of silicates, alumino-silicates, silica, alumina or silica/alumina mixtures. In one example they are kaolin. |
