Appeal No. 1998-1015
Application No. 08/208,912
wherein said quasi-reversible thermochromic coloring
material has a temperature hysteresis characteristic such that when
said coloring material is in a first colored state and the temperature
thereof is raised to a first temperature, the first colored state starts
to change to a second colored state, and completely becomes the
second colored state at a temperature range higher than TB, which
is higher than said first temperature, and said coloring material
remains in the second colored state at the temperature range
between said first temperature and a second temperature which is
lower than said first temperature, and when the coloring material
is in the second colored state and the temperature is lowered to the
second temperature, the second colored state starts to change to
the first colored state, and completely becomes the first colored
state at a temperature range lower than a temperature TA, which is
lower than said second temperature, and said coloring material
remains in the first colored state at the temperature range between
said second and first temperature, wherein the temperature TA is
within the range of about 0/C to about 15/C, the temperature of TB
is within the range of about 27/C to about 90/C, and the
temperature range between the second temperature and the first
temperature is within the range of about I0/C to about 35/C, and
wherein said quasi-reversible thermochromic coloring
material comprises:
(A) an electron-donating chromatic organic
compound selected from the group consisting of diaryl
phthalides, indolyl phthalides, polyaryl carbinols, leuco
auramines, acyl auramines, aryl auramines, Rhodamine B
lactams, indolines, spiropyrans and fluorans;
(B) a compound selected from the group consisting of
phenolic compounds having 6 to 49 carbon atoms, metal
salts of the phenolic compounds, aromatic carboxylic acids
having 7 to 12 carbon atoms, aliphatic carboxylic acids
having 2 to 5 carbon atoms, metal salts of carboxylic acids
2
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Last modified: November 3, 2007