| 摘要 |
A color changing pigment composition which changes color reversibly when heated comprising (a) a cyclic aryl lactone dye, (b) a diaminoalkane activator and (c)an ester. The pigment composition can also include a white pigment such as titanium dioxide as an opacifier or a yellow dye such Hansa yellow G. The pigment composition changes from a dark color, e.g. blue, to white when the composition is heated to a specified temperature, e.g. to a temperature of 52 DEG C., and reversibly changes from white back to the blue color when the pigment composition is cooled, e.g. to a temperature below about 25 DEG C.
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