Abstract: A pressure-sensitive record sheet material comprising a supporting web material having adhesively bound on the surface thereof a coating composition comprising kaolin clay, a zinc-modified alkyphenol-formaldehyde resin and a metallic compound selected from the group consisting of calcium oxide, calcium hydroxide and magnesium oxide, said resin and metallic compound combining to produce an improved color response when contacted with a color-producing material.

Abstract: Improved print speed and image intensity are obtained in a pressure-sensitive record sheet material by incorporating a cross-linked urea-formaldehyde agglomerated resin pigment in the coated surface of the acid-reacting sheet. A typical formulation of the coating comprises kaolin clay, a zinc-modified phenol-formaldehyde resin, said urea-formaldehyde resin pigment and a suitable binder. When contacted under pressure with a surface containing microscopic rupturable capsules of a colorless chromogeneous material, a colored mark is formed by transfer of the colorless chromogeneous material to the acidic pigment coating.