Abstract: An object of the present invention is to provide: a developer that can provide a thermosensitive recording material excellent in color development sensitivity and storage stability; and a thermosensitive recording material obtained using the developer. The object is achieved by a developer including a compound represented by the following Formula (1). In Formula (1), a, A, and L are as follows: a is an integer selected from 1 to 5, A is each independently a fluoro group or a perfluoroalkyl group, and L is any of functional groups represented by the following Formula (2): wherein in Formula (2), R is a C1-C4 alkyl group, and * represents a binding site to a sulfur atom in Formula (1).

Abstract: An object is to provide a thermosensitive recording material and a laminate which are excellent in color development sensitivity and favorable in storage characteristics such as heat resistance, plasticizer resistance, moisture resistance, oil resistance, and grease resistance. A thermosensitive recording material in which a thermosensitive recording layer is provided on a support, wherein the thermosensitive recording layer contains a specific diphenylsulfone compound and an analog compound thereof at a specific ratio. A laminate in which a thermosensitive recording layer is provided on a support, wherein the thermosensitive recording layer contains a specific diphenylsulfone compound and an analog compound thereof at a specific ratio.

Abstract: An object is to provide a thermosensitive recording material and a laminate which are excellent in color development sensitivity, which cause less color development in a blank area even at a high temperature, which are also favorable in storage stability of a print area, and which are excellent in contrast between a blank area and a print area. A thermosensitive recording material in which a thermosensitive recording layer is provided on a support, wherein the thermosensitive recording layer contains a specific diphenylsulfone compound and an analog compound thereof at a specific ratio. A laminate in which a thermosensitive recording layer is provided on a support, wherein the thermosensitive recording layer contains a specific diphenylsulfone compound and an analog compound thereof at a specific ratio.

Abstract: The present invention provides a compound represented by the formula (1). The compound represented by the formula (1) is a developing agent superior in both color-developing sensitivity with low energy and image stability [in the following formula, wherein R1 is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or an aralkyl group, R2 in the number of m are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group, R3 in the number of n are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group, and m and n are each independently an integer of 0-4.

Abstract: The invention provides a phenolsulfonic acid aryl ester represented by formula (1) wherein each symbol is as defined in the description. The phenolsulfonic acid aryl ester is useful as a developer to provide a thermal recording material with good color-developing sensitivity, image density when printed at a low application energy (i.e., high start-up sensitivity), and heat and plasticizer resistance. The invention also provides a thermal recording material using the developer.

Abstract: The present invention provides a compound represented by the formula (1). The compound represented by the formula (1) is a developing agent superior in both color-developing sensitivity with low energy and image stability [in the following formula, wherein R1 is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or an aralkyl group, R2 in the number of m are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group, R3 in the number of n are each independently an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an alkoxy group, a halogen atom, a hydroxy group, a cyano group, a nitro group, a carboxy group or an amino group, and m and n are each independently an integer of 0-4.

Abstract: The invention provides a phenolsulfonic acid aryl ester represented by formula (1) wherein each symbol is as defined in the description. The phenolsulfonic acid aryl ester is useful as a developer to provide a thermal recording material with good color-developing sensitivity, image density when printed at a low application energy (i.e., high start-up sensitivity), and heat and plasticizer resistance. The invention also provides a thermal recording material using the developer.