The Inctec Inc.

Seiko Epson Corporation

Intec Inc.

Dnp Fine Chemicals Co., Ltd.

Mitsuteru Yamada

Mitsuyoshi Tamura

Yukio Sugita

Fumie Yamazaki

Naoki Shiraishi

Tamayo Okahira

Kazuhiko Hara

Kisei Matsumoto

Keishiro Yoshimori

Yoshiya Maegawa

Yuka Orikasa

Koujun Utaka

Ryouhei Oka

Takashi Kozuchi

A nonaqueous ink composition contains organic solvents. The organic solvents include an organic solvent (a) and an organic solvent (b). Organic solvent (a): Glycol ether dialkyl. Organic solvent (b): At least one selected from the group consisting of alkylamide-based solvents (b1), cyclic amide-based solvents (b2), and lactone-based solvents (b3) each having a ring including six or more members.

Nonaqueous ink composition, and recording method and recorded matter manufacturing method using same

The object of the invention is to provide an inkjet recording oil green ink composition that excels more in terms of all the quality of prints, stability on printing, the ability of prints to be dried, and ink storage stability, and is capable of making wider a color reproduction area expressed by yellow and cyan. The inkjet recording oil green ink composition contains as an organic green pigment coloring agent C. I. Pigment Green 58 comprising a (poly) halogenated zinc phthalocyanine. The invention also provides an ink set comprises the inventive oil green ink composition and further includes at least an oil yellow ink composition and an oil cyan ink composition.

Oil green ink composition for inkjet recording, and oil ink set for inkjet recording containing said ink composition

The present invention is proposed is an oil-based white ink composition for ink jet recording, comprising a white pigment, a glycol ether dialkyl ether compound solvent, a polymeric dispersant, and a specific acrylic resin. The white pigment is formed of titanium oxide fine particles having an average particle diameter of not less than 0.15 &#x3bc;m and not more than 0.25 &#x3bc;m and coated with at least one of aluminum oxide and silicon oxide. The white pigment is further coated with not less than 0.01% by mass and not more than 2.5% by mass of at least one of an SiH-containing polysiloxane and dimethylpolysiloxane.

Oil-based white ink jet recording composition and process for producing the same

The invention provides an oil-based ink composition for ink jet recording, which is best suited for printing onto polyvinyl chloride substrates, and improved in terms of both the stabilities of ink on storage and jetting, and a method for inspecting the same. The oil-based ink composition for ink jet recording comprises as a main solvent at least a specific polyalkylene glycol dialkyl ether and containing at least a specific quinacridone pigment component. That composition should be such that when a measuring sample comprising it is analyzed by means of high speed liquid chromatography under specific measuring conditions, the concentration of a component having a peak at the holding time of 10.3 minutes is 0.4 ppm or less.

Oil-based ink composition for ink jet recording and method for inspecting it

The object of the invention is to provide an oil ink set capable of obtaining images having high color reproduction capabilities and high color saturation in particular. The oil ink set of the invention comprises a firsts a second, and a third oil ink having a wavelength region in which the reflectivity of each oil ink on a recording medium changes from 80% to 5% in the wavelength range of 400 nm to 700 nm. In this wavelength region, the reflectivity of the first oil ink is continuously higher than that of the first oil ink, and in the wavelength in which the reflectivity of the second oil ink changes from 80% to 5%, the reflectivity of the third oil ink is continuously higher than that of the second oil ink. Moreover, the coloring materials in the first, the second and the third oil inks are all different.

Oil ink set

An oil-based ink composition for inkjet printers contains a fixing polymer and a solvent represented by the following formula (1): wherein X1 represents an alkyl group, X2 represents a hydrogen atom or alkyl group, and n stands for an integer of from 1 to 4. The fixing polymer is an acrylic polymer obtained by subjecting an acrylic monomer to solution polymerization with a radical polymerization initiator in the solvent. A production process of the oil-based ink composition is also disclosed.

Oil-based ink compositions for inkjet printers

Growing community of inventors

Yokohama, Japan

Mitsuteru Yamada