Patent ID: 6077642
Filing Date: 2000-06-20
Classification: B41M,G03C

Abstract:
A recording material comprising a substrate and a heat-sensitive recording layer thereon, wherein the heat-sensitive recording layer contains a diazonium salt and a coupler which develops a color by reacting with the diazonium salt, and wherein the heat-sensitive recording layer is produced by laminating recording layers capable of coloring to yellow, magenta and cyan, respectively, and a protective layer is formed on the heat-sensitive recording layer, and the substrate comprises a sheet of base paper and a plastic film layer present at least on the side of the base paper at which the heat-sensitive recording layer is to be formed, and the plastic film layer is produced by melt-coextrusion of an olefinic resin and a random copolymer formed by copolymerizing ethylene and vinyl alcohol, and said recording material is characterized in that the oxygen transmission rate of the substrate is not greater than 50 cm.sup.3 /m.sup.2 .multidot.24 h.multidot.atm, wherein the oxygen transmission rate is calculated by the following equation:O.sup.2 GTR=(E.sub.e -E.sub.0)Q/(AR)whereO.sup.2 GTR is the oxygen transmission rate (cm.sup.3 /m.sup.2 .multidot.24 h.multidot.atm);E.sub.e is the measured voltage (V);E.sub.0 is the base line voltage (V);Q is a calibration constant;A is the transmission area (cm.sup.2); andR is the load resistance (.OMEGA.).