| 摘要 |
<p>This disclosure is directed to mark-forming record material containing two essential color-forming reactants which produce color upon contact with one another in the presence of a mutual liquid solvent wherein (A) one of said color-forming reactants is a phenolic resin containing at least 70 percent, by weight, of oil-soluble, amorphous, free-hydroxy-group-containing, room-temperature-solid, thermoplastic polymeric condensates of formaldehyde and at least one p-substituted phenol of which at least 10 percent, by weight, is a p-substituted phenol wherein the p-substituent is electron-attracting (for example, a p-halo-substituent), said polymeric condensates containing at least three p-substituted phenol units per molecule, and wherein (B) the other essential color-forming reactant is a basic chromogenic material; for example, Crystal Violet Lactone. The polymeric condensates of (A) may be a mixture of polymer chains, each polymer chain having three or more of the same or different recurring p-substituted phenol units per molecule with methylene bridges between adjacent p-substituted phenol units. Where the polymer resin of (A) is not entirely composed of condensates having recurring phenolic units bearing p-electron-attracting substituents, the remaining recurring phenolic units bear p-electron-donating substituents; for example, p-alkyl substituents.</p> |
