Sakura Color Products Corporation

Shoko Matsumoto

Hiroshi Inoue

Takeshi Omatsu

Yasunori Nakatani

Hiroyoshi Yamamoto

Norimasa Kurihara

Shigeki Yoneda

Kyoko Sano

Kozaburo Fujita

Hidetoshi Fukuo

Naoshi Murata

Tomohiro Sawa

Satoshi Maruyama

Norihiro Hirano

Kaoru Matsumoto

Hiroyoshi Sakura Color Products Corp Yamamoto

Hiroyoshi c/o Sakura Color Products Corp Yamamoto

Yasunori c/o Sakura Color Products Corp Nakatani

Norimasa c/o Sakura Color Products Corp Kurihara

Hiroshi c/o Sakura Color Products Corp Inoue

Tomohiro c/o Sakura Color Products Corp Sawa

Takeshi c/o Sakura Color Products Corp Omatsu

Shigeki c/o Sakura Color Products Corp Yoneda

Kyoko c/o Sakura Color Products Corporation Sano

Hiroshi Sakura Color Products Corporation Inoue

Takeshi Sakura Color Products Corporation Omatsu

Kozaburo c/o Sakura Color Products Corp Fujita

Norimasa Sakura Color Products Corp Kurihara

Shigeki Sakura Color Products Corporation Yoneda

Yasunori Sakura Color Products Corp Nakatani

Kyoko c/o Sakura Color Products Corp Sano

Kozaburo c/oSakura Color Products Corp Fujita

In a water-based ink composition of the present invention, 2.5 to 50 wt % of white-colored resin particles and 2.5 to 50 wt % of film-forming resin emulsions in a solid content are contained with respect to the total amount of the ink, the ratio of said white-colored resin particles to film-forming resin emulsions is 1:0.2 to 1:3, and not less than 20 wt % of said white-colored resin particles and film-forming resin emulsions in a solid content are contained in total.

Water-based ink composition

A tip unit () incorporated in a liquid applicator such as a ball-point pen, the tip unit being capable of an increased rate of liquid discharge with no leaking or clogging problem. To achieve it, the tip unit () is accommodated in a tip body () having a ball housing (), a ball (), a capillary hole (), and a proximal bore, the ball housing () being a passage for allowing liquid to flow therethrough, the ball () being rotatively held in the ball housing (). The ball housing () is provided with at least one ink channel () adapted to communicate the ball housing () with the capillary hole () or the proximal bore. The ball housing () has a ball resting seat () and a side wall () that are connected by a connecting surface () having a shape of a truncated conical surface with its apex toward the distal end of the tip unit ().

Tip unit for liquid applicator, method for producing the same, and liquid applicator having the tip unit

A method for producing a tip unit for a liquid applicator including: a first process of shaping the contour of a tip body in the form of a truncated conical surface; a second process of forming a ball housing having an open end at its distal end in the tip body; a third process of placing a ball into the ball housing; a fourth process of scraping the peripheral side of the distal end portion of the tip body to form a peripherally scraped portion after the first process; and a fifth process of deforming the peripherally scraped distal end portion of the tip body toward the ball.

Method of producing applicator tip

The ink of the present invention comprises at least a three-dimensional film-forming component and water, comprises an adhesive synthetic resin emulsion as said three-dimensional film-forming component, and comprises at least 30% by weight of said adhesive synthetic resin emulsion on the basis of the solid content with respect to the total amount of the ink, and minimum film-forming temperature (MFT) of said adhesive synthetic resin emulsion is not greater than 25&#xb0; C. and further, said ink comprises 1 to 3% by weight of a film-forming assistant with respect to the total amount of the ink.

Aqueous ink composition

A polychromic ink composition depending on viewing angle comprises 0.5 to 40% by weight of cholesteric liquid crystal polymer particles whose maximum particle diameter is 1 to 200 &mgr;m, 1.0 to 30.0% by weight of binder resins, 0.05 to 20% by weight of pigments with a deep-colored coloring matter whose average particle diameter is 0.01 to 0.5 &mgr;m, 0.01 to 5.0% by weight of a shear-thinning property imparting agent, and water with respect to the total amount of the ink composition.

Polychromic ink composition depending on viewing angle

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Tokyo, Japan

Shoko Matsumoto