| 摘要 |
PURPOSE:To improve thermal response and color density by adding a specific compound. CONSTITUTION:In a compound expressed by formula (1), m is an integer of 0 or 1; n is an integer of 0 or 1 to 5; R1, R2 are hydrogen atom and a low alkyl group with 1 to 5 carbon atoms, an alkenyl group and an aralkyl group with the same number and can be the same as the other or different from each other. In addition, R1 and R2 can bind with the other to form a ring. A compound can easily be synthesized. For example, thioether is synthesized by chemical reaction of p-hydroxythiophenol with cinnamylhalide and then allowing the obtained thioether and aklylhalide to undergo a chemical reaction. The dosage of a developer is 5 to 400wt.% for a dye precursor, especially 20 t 300wt.% for more favorable blending. A specific chemical compound is added to the developer at an addition ratio of 5 to 400wt.% for the latter, and more favorably, 20 to 300wt.%. |
