Sakura Color Products Corporation

United Kingdom Atomic Energy Authority

Hiroyoshi Yamamoto

Yasunori Nakatani

Hiroshi Inoue

Takeshi Omatsu

Norimasa Kurihara

Kyoko Sano

Shigeki Yoneda

Shoko Matsumoto

Kozaburo Fujita

Shigeyasu Inoue

Atsushi Ito

Tomohiro Sawa

Tatsuya Ozu

Tadaaki Ito

Shingo Uzukawa

Shigeto Taguchi

Atushi Sudo

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 stamp marker capable of adhering an application liquid to a target. The stamp marker includes a liquid-permeating member and a container containing an application liquid, the liquid-permeating member including a distal member, a base, and a fixing member. The distal member has a surface having a contacting part and a noncontacting part, the contacting part having a shape, so as to copy the shape onto the target by bringing the surface of the distal member into contact with the target to make the liquid adhere to the target, so that an adhesion mark of a predetermined shape is formed on the target.

Stamp marker

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 ball for a ball-point pen is provided which is composed of a sintered material obtained by sintering hard particles and having an average inter-particle diameter of not greater than 0.2 &mgr;m. The gaps between the hard particles are very small and, therefore, very few minute fragments of the hard particles are exposed from binder metal portions on the surface of the ball and fall off to act as an abrasive during use of the ball-point pen. Thus, abrasion of a pen tip body and sinkage of the ball into the pen tip body can be prevented.

Ball for ball-point pen

The invention provides an erasable aqueous ink composition comprising, based on the total weight of the ink composition, 3 to 50% of a resin having a minimum film-forming temperature of not lower than 40.degree. C., 0.01 to 10% of a water-insoluble dye, 0.5 to 50% of a water-soluble organic solvent and 20 to 60% of water.

Erasable aqueous ink composition

A device for preventing drying of ink in a writing instrument, in particular, a writing instrument provided with a tubular holder made of synthetic resin. The writing instrument is internally provided with a tubular ink-cartridge containing ink and a liquid retainer impregnated with liquid whose vapor pressure is higher than that of the liquid in the ink in the ink-cartridge, provided in an inner space of the holder so as to control evaporation of ink from the cartridge by the use of vapor evaporating from the impregnated retainer.

Device for preventing drying of ink in writing instrument

An aqueous ink composition for ball-point pens which comprises (i) 84.5 to 99.7 parts by weight of an aqueous medium consisting of 40 to 95% by weight of water and 60 to 5% by weight of a wetting agent, (ii) 0.1 to 15 parts by weight of a water-soluble or water-dispersible coloring agent and (iii) 0.2 to 0.45 part by weight of xanthan gum in 100 parts by weight of the total composition; and an aqueous ink composition for ball-point pens which comprises (i) 74.5 to 99.2 parts by weight of an aqueous medium consisting of 33 to 95% by weight of water and 67 to 5% by weight of a wetting agent, (ii) 0.1 to 15 parts by weight of a water-soluble or water-dispersible coloring agent, (iii) 0.2 to 0.45 part by weight of xanthan gum and (iv) 0.5 to 10 parts by weight of a permeable organic solvent in 100 parts by weight of the total composition.

Growing community of inventors

Kobe, Japan

Hiroyoshi Yamamoto