Heat-sensitive recording material and novel crystal of...

C - Chemistry – Metallurgy – 07 – C

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C07C 317/22 (2006.01) B41M 5/28 (2006.01) B41M 5/333 (2006.01)

Patent

CA 2260146

A heat-sensitive recording material in which a heat-sensitive color-developing layer comprising, as the main components, a usually colorless or light-colored color former and a developer capable of developing the color former upon heating on a support, characterized by comprising, as the developer, crystals of 3,3'-diallyl--4,4'-dihydroxy-diphenyl sulfone which have DSC (Te) of at least 149°C and which are of a crystal form characterized by an X-ray diffraction pattern having peaks at least at diffraction angles (2.theta.) [°] of 7.2 and 22.0, obtained by an X-ray powder diffractometry using Cu-K.alpha. rays. This heat--sensitive recording material is high in sensitivity, little in Discoloration of the ground in heat and moisture and excellent in image durability.

L'invention a trait à un matériau de thermogravure pourvu d'un revêtement de colorant thermique sur un substrat, ce revêtement étant principalement constitué d'un composé révélateur de couleur, habituellement incolore ou de teinte pâle, et d'un composé développateur capable de diriger le développement des couleurs exécuté par le composé révélateur de couleur après exposition à la chaleur. Le composé développateur contient des cristaux de 3,3'-diallyl-4,4'-dihydroxyphényl sulfone d'une analyse calorimétrique à compensation de puissance (DSC) (Te) égale ou supérieure à 149 DEG C. La forme cristalline est caractérisée par un diagramme de diffraction des rayons X ayant une crête, au moins à des angles de diffraction (2 theta ) [ DEG ], de 7,2 et 22,0, comme mesuré par diffractométrie de rayons X sur poudre utilisant une ligne Cu-K alpha . Ce matériau de thermogravure, qui possède une sensibilité élevée, est peu susceptible de provoquer un effet de voile dans les parties non exposées après exposition à une chaleur humide et permet d'obtenir des images d'une grande stabilité au stockage.

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