The Pilot Ink Co., Ltd.

Shigehiro Koide

Kuniyuki Senga

Katsuyuki Fujita

Jun Sugai

A reversible thermochromic display article which comprises a substrate and, formed thereon, a heat coloration image containing a heat coloration type reversible thermochromic composition which is colored by heating and is decolored by cooling and a heat decoloration image containing a heat decoloration type reversible thermochromic composition which is decolored by heating and is colored by cooling, or having a multilayer structure comprising a heat coloration layer containing the heat coloration type reversible thermochromic composition and a heat decoloration layer containing the heat decoloration type reversible thermochromic composition, wherein the heat coloration type reversible thermochromic composition is a microcapsule composition which contains, enclosed therein, (a) an electron-donating chromatic organic compound, (b)' an electron-accepting compound selected from gallic acid esters, and (c) a reaction medium having a melting point lower than 50&#xb0; C. which is selected from alcohols, esters, ketones, and hydrocarbons and which causes color reactions between the two components to occur reversibly at specific temperatures.

Reversible thermochromic display article

A thermally color-developing reversibly thermochromic pigment which shows a uniform color density in the coloring temperature range and also shows an optimal &#x394;H value within a range of from 3 to 40&#xb0; C. Thermally color-developing reversibly thermochromic pigments of a three component system having a &#x394;H value within a range of from 7 to 40&#xb0; C. in which at least essential three components including (a) an electron-donating chromic organic compound, (b) a specified compound selected from the gallic acid esters and (c) a reaction medium selected from alcohols, esters, ketones and hydrocarbons; which reversibly generates color reactions of both of the compounds within a specified temperature range and has a melting point of less than 50&#xb0; C., are microencapsulated, and of a four component system having a &#x394;H value within a range of from 3 to 25&#xb0; C. in which a compound (d) selected from monomer compounds having a melting point of 50&#xb0; C. or more or polymer compounds having a softening point of 70&#xb0; C. or more is added to the three component system.

Thermally color-developing reversibly thermochromic pigment

A reversibly thermochromic light-transmitting laminate member which has a satisfactory thermochromic function and undergoes alternate color changes between a colorless transparent state and a colored transparent state.

Reversibly thermochromic light-transmitting laminate member

A reversibly thermochromic light-shielding/light-transmitting laminate member. More particularly, the invention relates to a reversibly thermochromic light-shielding/light-transmitting laminate member which changes not only in color but in transmittance with temperature.

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Nagoya, Japan

Shigehiro Koide