A heat mode-applicable image-formation material having high sensitivity and excellent image-forming property, and a novel infrared absorber which can be suitably used in this material. The present invention relates to a substrate carrying thereon an image-formation layer which contains an infrared absorption agent. The agent has at least one surface orientation group in the molecule, and solubility of the image-formation layer in an alkaline aqueous solution is changed by action of radiation in the near-infrared range. Preferable as the infrared absorbing agent is an infrared absorber comprising, in a molecule thereof, a fluorine-containing substituent which have at least 5 fluorine atoms, or a polymethine chain of at least 5 carbon atoms and an alkyl group of at least 8 carbon atoms, said alkyl group being connected to the polymethine chain via any of nitrogen, oxygen and sulfur.
一种适用于热模式的高灵敏度和优异成像性能的图像形成材料,以及一种新型红外吸收剂,可适当地用于该材料中。本发明涉及一种携带有图像形成层的基板,该层含有红外吸收剂。该剂分子中至少有一个表面取向基团,并且通过近红外范围的辐射作用,可以改变碱性
水溶液中图像形成层的溶解度。作为红外吸收剂,最好选用含有至少5个
氟原子的含
氟取代基或至少5个碳原子的聚
甲烷链和至少8个碳原子的烷基,所述烷基通过氮、氧和
硫中的任何一种与聚
甲烷链连接。