| 摘要 |
PROBLEM TO BE SOLVED: To enhance heat-resistance preservability by the use of a compound expressed by a specific formula as an electron acceptable compound. SOLUTION: As an electron acceptable compound, a phenol compound is used as a compound being expressed by formula I (in the formula, (n) shows an integer of 1-3, (m) shows an integer of 1-20, (r) shows an integer of 0-3. X and Y express bivalent groups containing a hetero atom, R1 shows 1-20C bivalent hydrocarbon group, and R2 shows 2-20C hydrocarbon group). A colored state obtained by being cooled rapidly from a molten state is a state where a developing agent and coloring agent are blended in a state capable of being reacted in contact with each molecule, and in many cases, this forms a solid state. This is a state that hold coloring through a coagulation of the developing agent and coloring agent, and thereby coloring can be considered to be stable by forming the coagulation structure. On the other hand, a discolored state is that both of them are separated in its phase, and at least molecules of one compound are gathered to be a state of the formation of a domain or crystallization, so that the coloring agent and developing agent lead to a state being separated and stabilized. |
