Reversibly thermochromic microcapsule pigment
AssigneesKABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION), The Pilot Ink Co., Ltd.
InventorKatsuyuki FUJITA
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Abstract
A reversibly thermochromic microcapsule pigment according to the present invention has a reversible thermochromic composition encapsulated in microcapsules, the reversibly thermochromic composition consisting of a compound such as (A) an electron-donating color-developing organic compound, (B) a 4-hydroxybenzoic acid ester compound represented by General Formula (1) below as an electron-accepting compound, (C) a compound such as a chain hydrocarbon as a reaction medium that reversibly induces an electron transfer reaction by the (A) and (B), (D) a linear dibasic acid compound having 3 to 22 carbon atoms, and (E) an aromatic hydrocarbon having a melting point of 50° C. or higher, wherein R represents a linear or branched chain alkyl group having 12 to 22 carbon atoms.
Claims10
A reversibly thermochromic microcapsule pigment in which a reversibly thermochromic composition that turns into a color developed state by heating from a decolored state and turns into a decolored state by lowering a temperature from a color developed state is encapsulated in a microcapsule, the pigment comprising:
- (A) an electron-donating color-developing organic compound;
- (B) a 4-hydroxybenzoic acid ester compound represented by General Formula (1) below as an electron-accepting compound;
- (C) a compound selected from the group consisting of chain hydrocarbons, alicyclic hydrocarbons, and halogenated hydrocarbons as a reaction medium that reversibly induces an electron transfer reaction according to (A) and (B);
- (D) a linear dibasic acid compound having 3 to 22 carbon atoms;
- and
- (E) a compound selected from the group consisting of alcohols, esters, ethers, ketones, acid amides, and aromatic hydrocarbons having a melting point of 50° C. or higher,
- wherein R represents a linear or branched chain alkyl group having 12 to 22 carbon atoms.
Dependencies are inferred from the claim text.