Recording material
First Claim
1. 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 cm3 /m2 ·
- 24 h·
atm, wherein the oxygen transmission rate is calculated by the following equation;
space="preserve" listing-type="equation">O.sup.2 GTR=(E.sub.e -E.sub.0)Q/(AR)whereO2 GTR is the oxygen transmission rate (cm3 /m2 ·
24 h·
atm);
Ee is the measured voltage (V);
E0 is the base line voltage (V);
Q is a calibration constant;
A is the transmission area (cm2); and
R is the load resistance (Ω
).
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a recording material comprising a substrate and a recording layer thereon characterized in that the oxygen transmission rate of the substrate, as measured in accordance with Method B of JIS K 7126, is not greater than 50 cc/m2 /day. If necessary, a protective layer is formed on the recording layer. The substrate is composed of a sheet of base paper and a plastic film layer present at least on the side of the paper which faces a recording layer to be formed. The plastic film layer is appropriately selected from the group consisting of a polyester film, a polyvinylidene chloride film, a polycarbonate film, a polyvinylchloride film and a film of a random copolymer of ethylene and vinylalcohol. The recording material according to the present invention is excellent in the long-term preservation of images, fading resistance and light fastness.
56 Citations
6 Claims
-
1. 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 cm3 /m2 ·
- 24 h·
atm, wherein the oxygen transmission rate is calculated by the following equation;
space="preserve" listing-type="equation">O.sup.2 GTR=(E.sub.e -E.sub.0)Q/(AR)where O2 GTR is the oxygen transmission rate (cm3 /m2 ·
24 h·
atm);Ee is the measured voltage (V); E0 is the base line voltage (V); Q is a calibration constant; A is the transmission area (cm2); and R is the load resistance (Ω
). - View Dependent Claims (2, 3, 4)
- 24 h·
-
5. A recording material comprising a substrate and a heat-sensitive recording layer thereon, wherein the heat-sensitive recording layer contains an electron donating colorless compound and an electron accepting compound, 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 cm3 /m2 ·
- 24 h·
atm, wherein the oxygen transmission rate is calculated by the following equation;
space="preserve" listing-type="equation">O.sup.2 GTR=(E.sub.e -E.sub.0)Q/(AR)where O2 GTR is the oxygen transmission rate (cm3 /m2 ·
24 h·
atm);Ee is the measured voltage (V); E0 is the base line voltage (V); Q is a calibration constant; A is the transmission area (cm2); and R is the load resistance (Ω
). - View Dependent Claims (6)
- 24 h·
Specification