20 августа, 2015 
Malyar Pressure-sensitive recording materials are obtained by dissolving a triphenylmethane leuco dye in a solvent composed of paraffin oils. The microcapsules are formed from a water-soluble106 or water-dispersible material.107,108 Leuco dyes dissolved in sunflower oil are microencapsulated in a solution containing a melamine-HCHO precondensate and coated on the back side of a paper sheet. Contact of the microcapsule-coated sheet with an acid-coated receptor sheet allows the color formation to occur.
A clay mineral and/or its acid-treated products109,110 are used as color developers. A diphenylmethane derivative of structure 82 has been micro-
A = N-Heterocycle, — NHNH-, — O-, — OR, NHR
capsulated and used as pressure-sensitive recording material111 to give light-, water-, and plasticizer-resistant colors.112 Normal triphenylmethane derivatives are good solvents for the triphenylmethane color formers.113
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