Mitsubishi Chemical Corporation

Sony Corporation

Mio Ishida

Yukichi Murata

Yasushi Shiga

Kenji Shinozaki

Hideki Hirano

Yuki Tanaka

Utako Takeda

Shoko Ichinosawa

Mitsuya Aoba

Kazuhiro Tanaka

Hideo Sano

Keita Kaifu

Miyuki Kuromiya

Masami Kadowaki

Yukihiro Sano

Koji Maeda

Wataru Shimizu

Hiroyuki Aikyo

Tomoko Kadowaki

An azo compound excellent in solubility in solvent and having a high absorbance coefficient is disclosed, as well as an ink containing the azo compound. Such an ink contains a solvent having a relative permittivity at 22&#xb0; C. and at a measurement frequency of 1 kHz of 3 or less and having a solubility in water at 25&#xb0; C. of 20 mg/L or less, and an azo compound.

Azo compound, ink containing azo compound, and display and electronic paper containing the ink

The present invention relates to an ink comprising: a solvent having a relative permittivity, measured at a frequency of 1 kHz and a temperature of 22&#xb0; C., of 3 or less and a solubility in water at 25&#xb0; C. of 20 mg/L or less; and a specific azo compound.

Azo compound, ink containing azo compound, display including said ink and electronic paper

An object of the present invention is to provide an ink containing an azo compound which is excellent in solubility in a solvent and has a high extinction coefficient. The present invention relates to an ink comprising a solvent having a relative permittivity of 3 or less, as measured at a frequency of 1 kHz and at 22&#xb0; C. and having a solubility in water of 20 mg/L or less at 25&#xb0; C. and a specific azo compound.

AZO compound and ink containing the compound

An object of the present invention is to provide an anthraquinone based dye having excellent solubility in a low polar solvent and having high absorption coefficient and high light resistance and an ink containing the same. The present invention relates to an ink comprising a specific anthraquinone based dye.

Ink containing anthraquinone based dye, dye used in the ink, and display

The invention relates to an ink which comprises: a low-polarity solvent having a relative permittivity of 3 or less at a measuring frequency of 1 kHz; and a specific heterocyclic azo dye.

Ink containing heterocyclic azo dye, and dye for use in said ink

The invention provides a specific pyrazole disazo dye which is a yellow dye having excellent solubility in nonpolar solvents, in particular, hydrocarbon solvents, and having a high extinction coefficient. The dye preferably is preferably a pyrazole disazo dye represented by the following general formula (I): (wherein Rrepresents a C-Calkyl group; Rrepresents a C-Calkyl group; the six-membered ring A represents a phenyl group which may have a substituent; and the six-membered ring B represents a phenylene group which may have a substituent).

Pyrazole disazo dye and ink containing the dye

Provided are a dichroic dye composition in which a solubility of the dichroic dye with respect to liquid-crystal is sufficiently high and a wavelength dispersion of absorbance is small in a wide wavelength range, and a black guest-host liquid-crystal composition indicating high order parameters using such a dichroic dye composition and a liquid-crystal element having high contrast. The dichroic dye composition includes at least one dichroic dye selected from Group (I) shown below, at least one dichroic dye selected from Group (II) shown below, and at least one dichroic dye selected from Group (III) shown below. 

Dichroic dye composition, and liquid-crystal composition and liquid-crystal element including dichroic dye

Provided are a thermal transfer yellow ink and a thermal transfer sheet capable of providing a thermal transfer recorded product exhibiting a clear yellow tone with a high density by low energy and having an excellent color tone and light resistance, and also capable of exhibiting a favorable green color tone with a high density when mixed with cyan. Provided are a dye composition characterized by comprising a dye having an arylidene pyrazolone skeleton and a dye having a bispyrazolone methine skeleton; a thermal transfer ink characterized by comprising a dye having an arylidene pyrazolone skeleton, a dye having a bispyrazolone methine skeleton, and a medium; and a thermal transfer sheet comprising a substrate and a colorant layer formed thereon, wherein the colorant layer comprises a dye having an arylidene pyrazolone skeleton and a dye having a bispyrazolone methine skeleton.

Thermal transfer ink, thermal transfer sheet, and thermal transfer recording method using the same

A water-soluble complex dye capable of forming an image having light resistance, ozone resistance and high saturation; a water-based recording fluid, particularly an ink jet recording fluid, employing such a dye; an ink set employing such a recording fluid; and an ink jet recording method, are presented.

Water-soluble complex dye, recording fluid and recording method

A thermal transfer ink is provided, which includes:

Ink for thermal transfer, sheet for thermal transfer, and thermal transfer recording method using the same

A disazo dye for thermal transfer recording of the following formula (I):

Disazo dye for thermal transfer recording and thermal transfer sheet and ink for thermal transfer recording, employing it

A thermal transfer recording material for use in a recording apparatus in which said thermal transfer recording material is introduced into a transfer section having a porous structure by an effect of capillarity, subjected to a state transformation by heating, and then transferred to a recording medium disposed opposed to said transfer section, comprising: a dye having a melting point of 160.degree. C. or lower, selected from the group consisting of a dye represented by the general formula (I): ##STR1## wherein A.sup.1, R.sup.1 and R.sup.2 are as defined, and a dye represented by the general formula (II): ##STR2## wherein A.sup.2, R.sup.3 and R.sup.4 are as defined.

Thermal transfer recording material

A thermal transfer recording material for use in a recording apparatus in which the thermal transfer recording material is introduced into a transfer section having a porous structure by an effect of capillarity, subjected to a state transformation by heating, and then transferred to a recording medium disposed in an opposed relation to the transfer section, comprising:

Thermal transfer recording material and thermal transfer recording

A benzothiazole azo dye for thermal transfer recording of the following formula (I): ##STR1## wherein R.sup.1 is a C.sub.3-8 branched chain alkyl group, R.sup.2 is a substituted or unsubstituted alkyl group, X is a hydrogen atom, a lower alkyl group, a formylamino group, a lower alkylcarbonylamino group, a lower alkoxycarbonylamino group or a benzoylamino group, Y is a chlorine atom or a bromine atom, and Z is a hydrogen atom, a chlorine atom or a bromine atom.

Benzothiazole azo dye and thermal transfer sheet employing it

A thermal transfer recording material for use in a recording apparatus in which the thermal transfer recording material is introduced into a transfer section having a porous structure by an effect of capillarity, subjected to a state transformation such as vaporization or droplet formation by heating, and then transferred to a recording medium disposed opposed to the transfer section, comprising: a dye having a molecular weight of 400 or less and represented by the general formula (I): ##STR1## where A is a substituted or unsubstituted p-phenylene group, R.sup.1 and R.sup.2 are individually a hydrogen atom, a substituted or unsubstituted alkyl or alkenyl group, a cycloalkyl group or a substituted or unsubstituted phenyl group; and R.sup.1 may constitute a heterocyclic group composed of a five- or six-member ring in combination with the p-phenylene group A and a nitrogen atom adjacent to the p-phenylene group A, or another heterocyclic group composed of a five- or six-member ring in combination with R.sup.2 and the nitrogen atom adjacent to the p-phenylene group A.

Growing community of inventors

Kanagawa, Japan

Mio Ishida