Abstract: The object of the present invention is to provide a novel developer capable or realizing a thermal recording material superior in preservation stability (i.e., heat resistance, moisture resistance) of color images and non-image areas, while satisfying the recent request for high sensitivity, and a thermal recording material using the developer.

Abstract: The object of the present invention is to provide a novel developer capable or realizing a thermal recording material superior in preservation stability (i.e., heat resistance, moisture resistance) of color images and non-image areas, while satisfying the recent request for high sensitivity, and a thermal recording material using the developer.

Abstract: A thermally recording sheet which has high sensitivity in color development, satisfactory background heat resistance, and a satisfactory background color. The sheet contains a dihydroxydiphenylsulfone compound represented by general formula (1) as a color developer and a sulfonamide represented by general formula (2). In the formula, R1 and R2 each represents C1-8 alkyl, alkenyl, or halogeno; and a and b each is an integer of 0 to 3. In the formula, R3 represents C1-66 alkyl or electron-attracting group; and n is an integer of 0 to 2.

Abstract: The present invention is to provide a thermally sensitive recording type adhesive label possessing a thermally sensitive recording layer on a substrate, and an adhesive layer and a release paper on the reverse side of the substrate, wherein said substrate is a neutral paper containing a wet strength reinforcing agent and further containing 5-20 wt. % of a filler to the total weight of pulp.

Abstract: A thermal recording material which has high sensitivity in color development and a high whiteness of the background and is excellent in image retention and heat resistance. The thermal recording material contains a dihydroxydiphenylsulfon compound represented by general formula (1) as an organic color developer and 3-di-n-pentylamino-6-methyl-7-anilinofluoran as a colorless basic dye. (In the formula, R1 and R2 each represents C1-8 alkyl, alkenyl, or halogeno; and p and q each is an integer of 0 to 3.

Abstract: A thermal recording sheet which is satisfactory in sensitivity in color development, background heat resistance, and background color, is free from powdering, and has excellent image retention. The sheet comprises supporting and formed thereon a thermal color development layer containing as main components a colorless or light-colored basic dye and an organic color developer, and is characterized in that the thermal color development layer contains at least one dihydroxydiphenyl sulfone compound represented by general formula (1) as the organic color developer, and further contains either at least one saturated fatty acid monoamide represented by general formula (2) in an amount of 1.5 to 5 parts per part of the organic color developer or a combination of at least one saturated fatty acid monoamide represented by general formula (2) and at least one diphenyl sulfone derivative represented by the general formula (3).