Abstract:
The present disclosure is a method for controlling the hysteresis window and improving the color switching properties of reversible thermochromic dye systems. The method adds preferred co-solvents to existing reversible thermochromic dye systems in order to decrease the temperature range between the full color point and the clearing point. The co-solvents also add resistance to ultraviolet radiation.
Abstract:
A reversible two color thermal recording material comprising a supporting material and, supported thereon, a reversible thermally coloring composition which uses a colorless or light-colored electron-donating dye precursor and an electron-accepting compound and can form a colored state or a discolored state depending on its temperature heated and/or the cooling speed after heating, characterized in that said reversible thermally coloring composition comprises at least two components which are different in color tone from each other, are present separately and independently, and also are different from each other in the crystallization speed of said electron-accepting compound which causes the change from coloring to discoloring state.
Abstract:
A reversible thermally sensitive recording composition, which makes use of coloring and decoloring reaction between a leuco pigment and a developing and decoloring agent, uses a specified developing and decoloring agent, an inorganic loading material, amine compound and the like to form a thermally sensitive layer, and has an excellent repeated use characteristic, a favorable printing quality and a high coloring concentration; and a thermally sensitive recording sheet and a card using the thermally sensitive recording composition. The thermally sensitive recording sheet comprises at least a support substrate (1), a reversible thermally sensitive recording layer (2) and a protective layer (3). The thermally sensitive recording layer is constituted by a thermally sensitive recording composition, which contains a reversible coloring pigment, a coloring and decoloring agent, an inorganic loading material and an amine compound in an organic polymer-based binder, and in which the coloring and decoloring agent comprises an amide compound obtained by dewatering condensation of aliphatic carboxylic acid having a phenolic hydroxyl group, an aliphatic alkylamine. Thus it is possible to realize a thermally sensitive recording composition having a high coloring concentration, image stability with time, favorable printing quality, a cycle durability and rewritability, a thermaly sensitive recording sheet or a card using the thermally sensitive recording composition.
Abstract:
The recording medium disclosed comprises a substrate carrying a heat-sensitive film which can be converted into different optical states under the influence of temperature (e.g. opaque and transparent). These states are permanent at normal ambient temperature (e.g. room temperature) and reversible by heating to specific temperatures. The recording medium is designed such that four dots (F) are combined in groups of four to form zones (B), each of the dots (F) having a different primary colour (e.g. red, yellow, blue or black). If the heat-sensitive film over a dot (F) in a zone (B) is converted by appropriate warming to the transparent state, the dot lying under the film becomes visible. This makes it possible to record coloured data, either on a recording medium in the form of a sheet or in the form of a continuous strip from a display device.
Abstract:
To provide a reversible thermal discoloration aqueous ink composition which is capable of suppressing the lightening and deepening of handwriting at the time when a writing implement containing the reversible thermal discoloration aqueous ink composition in the barrel, and particularly, which does not lighten the color of handwriting with time in an erecting state or does not lighten the color of handwriting by the application of vibration at transportation or at the time when it is carried on in an erecting state, as well as a writing implement using the same and a writing implement set. A reversible thermal discoloration aqueous ink composition comprising water, a reversible thermal discoloration microcapsule pigment including a reversible thermal discoloration composition composed of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a reaction medium which determines a temperature at which color reactions of the both compounds occur, a polymer flocculant, a comb-type polymer dispersant having a carboxyl group at the side chain, an organic nitrogen sulfur compound, and a water-soluble resin; a writing implement 1 using the ink composition; and a writing implement set comprising the writing implement and a frictional body.
Abstract:
Ein organischer thermochromer Komplex, bestehend aus mindestens einem Farbstoff, mindestens einem Entwickler und mindestens einem Schmelzmittel, wird im Vakuumprozess auf ein Substrat abgeschieden. Das Substrat kann aus Glas, Keramik, Metall und deren Komplexe bzw. Oxide, dotiertes und undotiertes Halbleitermaterial oder Kunststoff bestehen. Die Kombination unterschiedlicher thermochromer Schichten ist möglich. Die thermochrome Schicht kann mit weiteren funktionellen Schichten kombiniert werden, wobei diese ebenfalls bedampft werden, oder mittels Sputtern oder CVD/OVPD-Technik abgeschieden werden oder durch Siebdruck, Sprühen, Schleudern bzw. gängigen Technologieverfahren aufgetragen werden. Der thermochrome Effekt ist reversibel, wobei der Schaltbereich vorher bestimmt werden kann.