Patent ID: 8198212

Claim:
A heat-sensitive recording material with comprising a substrate and a heat-sensitive recording layer that contains one or more color formers and two color acceptors, characterized by the fact that wherein the color formers are selected from the list comprising: 3-diethylamino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-anilinofluoran, 3-(N-methyl-N-propyl)amino-6-methyl-7-anilinofluoran, 3-(N-ethyl-N-isoamyl)amino-6-methyl-7-anilinofluoran, 3-(N-methyl-N-cyclohexyl)amino-6-methyl-7-anilinofluoran, 3-(N-ethyl-N-tolyl)amino-6-methyl-7-anilinofluoran, and 3-(N-ethyl-N-tetrahydrofuryl)amino-6-methyl-7-anilinofluoran, and the heat-sensitive recording layer contains two color acceptors, which are: N-(p-toluenesulfonyl)-N′-3-(p-toluenesulfonyloxyphenyl)urea with having the following formula (1): and a urea-urethane compound with having the following formula (2): wherein the ratio of the two color acceptors, i.e., the ratio of N-(p-toluenesulfonyl)-N′-3-(p-toluenesulfonyloxyphenyl)urea according to formula (1) to the urea-urethane compound according to formula (2), is in the range of 10:1 to 1:1, based on wt. % in the heat-sensitive recording layer.