Reversible heat sensitive recording composition
AssigneeThe Pilot Ink Co., Ltd.
InventorsTsutomu Kito, Norikazu Nakasuji, Takashi Kataoka, Hiroshi Inagaki, Yutaka Shibahashi
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Abstract
A new reversible heat sensitive recording composition for erasable recording is disclosed which is used as a recording or marking material that is capable of erasure at a specific temperature so that coloring or decoloring can be controlled to occur at desired temperature ranges. This range or the hysteresis value of the composition is determined by the .DELTA.T value of the contained ester compound. In addition, the composition can provide a wide variety of hues and can readily be prepared. The marking or recording drawn in this composition can be maintained at room temperature or less.
Claims2
A reversible heat-sensitive recording composition comprising:
- (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 having 2 to 22 carbon atoms, acidic phosphoric esters having 1 to 44 carbon atoms, metal salts of the acidic phosphoric esters and triazole compounds having 2 to 24 carbon atoms;
- and
- (C) an ester compound,
- said components (A), (B), and (C) being present in a weight ratio in the range of 1:0.1 to 50:1 to 800 and being in the form of homogenous fused mixture, wherein said component (C) is selected from the following compounds having .DELTA.T value [melting point (.degree.C.)-clouding point (.degree.C.)] in the range of from 5.degree. C. to less than 50.degree. C.:
- an alkyl ester, aryl ester and cycloalkyl ester of aromatic carboxylic acid having substituent(s) or not in the aromatic ring, a branched alkyl ester, aryl ester, arylalkyl ester and cycloalkyl ester of aliphatic carboxylic acid, an alkyl ester of alicylic carboxylic acid, a diester of dicarboxylic acid and a glyceride.
Dependencies are inferred from the claim text.