KOPIERINGSMATERIALE.

摘要

1348362 Record sheets NATIONAL CASH REGISTER CO 22 May 1972 [14 June 1971] 23874/72 Heading D2B Record sheets for use in pressure-sensitive copying processes comprise a supporting sheet carrying an oil-soluble metal salt of a phenolformaldehyde resin. The metal cation may be Al (III), Ba (II), Cd (II), Ce (III), Cs (I), Ca (II), Co (II), Cu (III), In (III), Mg (II), Mn (II), Mo (V), Ni (II), Pb (II), Na (I), Sr (II), Sn (II), Ti (IV), V (II), Zn (II) and Zr (IV). The metal resinate acts as a colourforming agent for base-reacting. colourless, chromogenic dye precursors. The latter may be carried on the same or a separate supporting sheet. The common solvent for the metal resinate and dye precusor may be encapsulated and isolated from one or both ¾f the reactants in a self-contained sheet. In a couplet system, the solvent may be carried on one of the sheets either on its own or together with one of the reactants, which is either dissolved in the solvent or isolated therefrom. Typical solvents include halogen - substituted and alkylated aromatic hydrocarbons and dialkyl phthalates.