| 摘要 |
PURPOSE:To Provide the titled material which has excellent durability and in which color change temperature can be arbitrarily controlled, containing a specified electron-accepting and color-changeable org. cpd., an electron-donating org. nitrogen cpd. and a cpd. which nullifier the color change action of the nitrogen cpd. at a specified temperature. CONSTITUTION:(A) An electron-accepting and color-changeable org. cpd. selected from a phthalein of formula I (wherein X is OH, OCOR, H; R is phenyl; B is CO, SO2; A is an atomic group which is required to form a five-membered or six-membered ring together with B, O and central carbon atoms bonded to O) (e.g. Thymolphthalein), a fluorescein of formula II (wherein X, B and A are as defined above) (e.g. sulfofluorescein) and a derivative thereof, (B) an org. nitrogen cpd. which exhibits electron donating property to the above cpd. (A) (e.g. ethylamine or thiourea), and (C) a cpd. which nullifier the color change action of the cpd. (B) on the cpd. (A) at a specified temperature (e.g. sorbitol or amyl acetate), are mixed together. The mixt. is molten by heating to obtain the titled material. |
