Dainippon Ink and Chemicals, Incorporated

Isao Tabayashi

Sadahiro Inoue

Hiroshi Fukutomi

Hiroshi Harada

Mitsuo Kase

Shinji Amaya

Ichiro Muramatsu

Yutaka Yamada

Hidetoshi Konno

Kazunari Kawai

Norie Osawa

Ritsuko Doi

Manabu Shimohata

Takahito Kinoshita

Hiromi Soma

Jet ink and process for preparing dispersion of colored fine particles

The present invention provides polymer fine particles for a jet ink, each polymer fine particle containing a colorant, wherein the polymer fine particles have an average particle diameter in the range of 5 to 700 nm, a maximum particle diameter of at most 1000 nm, and a particle size distribution, at m value of shape parameter according to the Weibull distribution, of at least 1.3, and wherein the polymer fine particles are able to form a coating film at room temperature. By using the aforementioned polymer fine particles as essential components according to the present invention, it is possible to provide polymer fine particles for a jet ink which display a superior storage stability, resistance to wear, durability, water resistance, solvent resistance, chemical resistance and the like, in which there is no clogging of the ink jet; and a jet ink comprising the aforementioned polymer fine particles which produces clear prints over a long period of time wherein smudging of the printed matter due to water or sweat does not easily occur.

Polymer fine particles for jet ink, process for producing the same, and

The present invention provides a color code for displaying information using an arranged combination of a plurality of color phase marks wherein the color code includes a plurality of column marks arranged at uniform intervals, and a plurality of color phase marks arranged around the periphery of each of the aforementioned plurality of column marks using each of the plurality of column marks as a reference. In order to read out the color code, initially, a column mark is read out, and after its arrangement has been determined, the color phase marks arranged at predetermined positions around the periphery of the column mark are read out. The codes, i.e. data, are then obtained by referencing combinations of color phases of the color phase marks read out with a predetermined color code table.

Color code

An ink for jet printer is disclosed, which contains an oil soluble dye, a synthetic resin, and an organic solvent, wherein the synthetic resin contains a terpene-phenol copolymer resin and a styrene-acrylic copolymer resin.

Ink for jet printer

An organic solvent-based ink composition for ink jet printer comprises a dye or dyes dissolved in a mixed solvent of a good solvent and a poor solvent, wherein

Ink composition

An organic solvent-based ink for ink-jet printer comprises at least one compound selected from the group consisting of an aromatic sulfonamide and a hydroxybenzoic acid ester and an oil-soluble dye dissolved in an organic solvent.

Organic solvent-based ink for ink-jet printer

A hot-melt type ink for thermal ink-jet printers comprises an oil-soluble dye dissolved in at least one compound selected from the group consisting of a phosphoric acid ester, an aromatic sulfonamide, a hydroxybenzoic acid ester and a phthalic acid ester, the compound being in solid state at room temperature.

Hot-melt type ink for thermal ink-jet printer

Ink for use in an ink-jet printer, said ink comprising a solution in water of a water-soluble dye, a wetting agent and a compound of the following formula ##STR1## wherein R represents --C.sub.m H.sub.2m+1 or --O--C.sub.m H.sub.2m+1, m represents O or an integer of 1 to 6, and n represents an integer of 1 to 10.

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Kuki, Japan

Isao Tabayashi