Sakura Color Products Corporation

Hidetoshi Fukuo

Kotaro Sumitomo

Masamitsu Takahashi

Naoshi Murata

Shinji Tsujio

Keiko Nakamura

Hiroshi Inoue

Hirokazu Matsuda

Satoshi Maruyama

Tomohiro Sawa

Shoko Matsumoto

Norihiro Hirano

Masakazu Yokoi

Tomio Onoguchi

Kaoru Matsumoto

Kimio Yoshikawa

Masaji Yamamoto

Ryotaro Kaba

Yoshiaki Masuda

Juzo Kuroda

Makoto Hirotani

Akiko Shirota

Jiro Nakagawa

Masamistu Takahashi

An oil-based pigment ink composition contains titanium dioxide pigment, mica pigment, dispersant, oil-soluble resin, and organic solvent, whose viscosity at a shear velocity of 76 (l/s) is 50 mPa-s or lower. The ink composition produces writing with sufficient covering property and legibility, does not form hard cakes, and can release ink in a stable manner from the tip of a writing tool.

Oil-based pigment ink composition and oil-based pigment ink writing tool

The invention provides a crayon which comprises an alternative plasticizer in place of the conventional phthalate ester plasticizers and yet provides writings excellent in water resistance, the crayon comprising a colorant, a gelling agent, an organic solvent, a resin component, and a plasticizer, wherein the plasticizer is at least one selected from diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, and alkylsulfonic acid phenyl ester and is contained in an amount of 1 to 20% by weight based on the crayon.

Crayon

The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises:

Crayon and process for producing the same

The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: 

The invention provides a process for producing a crayon without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises dissolving and dispersing carbon black and a resin component in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating, pouring the obtained raw material solution into a molding container, and then cooling and solidifying the solution, wherein carbon black having an average particle diameter of primary particles of 20 to 100 nm is used as the carbon black.

Process for production of black crayon

The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols.

Photostorage solid drawing medium

A water base erasable ink composition for use in marking pens which comprises 0.05-20% by weight of a colorant and 1-20% by weight of an oily material which is nonvolatile at normal temperatures (25&#xb0; C.) and is dispersed in water, wherein the oily material has a viscosity of 5-40 mPa&#xb7;s at 20&#xb0; C. and is dispersed in water in the form of emulsion, and wherein the colorant is dispersed in the water with the aid of a polyvinyl alcohol resin as a dispersing agent which has a saponification degree of 70-85 mol % and of which aqueous solution of 4% concentration has a viscosity of 2-30 mPa&#xb7;s at 20&#xb0; C. in a weight ratio of the resin to the colorant of 0.5 to 5 and in an amount of 1 to 10% by weight based on the ink composition.

Water base erasable ink composition for use in marking pens

The invention provides a crayon comprising an organic solvent, a resin soluble in the organic solvent, a coloring agent, a gelling agent and an interferential pearl luster pigment. The crayon provides a metallic or pearly coating film, and has characteristics such that the color tone of the coating film varies with an angle for viewing the coating film, namely, a visual angle for the coating film. Therefore, for example, when applied to a flaw caused in metallic or pearly coating of automobiles, the crayon is adapted to such coating of automobiles to form an integrated coating film, so that it is suitably used for repairing such a flaw.

The invention has for its primary object to provide a solid composition having excellent wet-surface writing properties and high safety. The object is accomplished by the provision of a solid composition characterized by its comprising a colorant, a gelation agent, a resin component and at least two kinds of solvents, each of the resins having the following attribute a) or b):

Solid composition

Disclosed herein is a first solid drawing material comprising water, a coloring agent, a solidifying agent that is a fatty acid alkali metal salt, and an O/W type emulsion of a separating agent that is an oily material which hardly volatilizes at room temperature. The first solid drawing material preferably contains silicone oil. A second solid drawing material is also disclosed, which comprises an organic solvent, a coloring agent, a solidifying agent that is at least one selected from the group consisting of dibenzylidene sorbitol, tribenylidene sorbitol, and derivatives thereof, a separating agent that is an oily material which hardly volatilizes at room temperature, and a resin soluble in the organic solvent. In these solid drawing materials, the separating agent is evenly dispersed, and therefore they have stable drawing properties and erasability.

Solid drawing material and method for producing the same

A central core type marking pen which has an ink storage portion of a central core and a pen tip connected thereto, wherein the central core contains a water-based pigment-containing ink composition which contains a thickening agent and exhibits, at 20&#xb0; C., a viscosity of not less than 45 mPa&#xb7;s and not greater than 12 mPa&#xb7;s when a stress of 0.01 and a stress of 10 Pa are applied, respectively.

Water-based pigment-containing ink composition for central core type marking pen

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

A primary object of this invention is to provide a novel crayon which assures that the crayon has all of higher safety, superior writability and improved adhesion, and the invention provides a crayon containing a pigment component, a gelling agent, an organic solvent and a resin component, the organic solvent consisting of propylene glycol monomethyl ether and dipropylene glycol monomethyl ether.

There is provided a novel fluorescent crayon having the quality characteristics of high coloring power, good drawing quality, and good adhesion all in one, while overcoming the drawbacks of the conventional crayon, that is to say a fluorescent crayon comprising a solution type fluorescent coloring agent, a gelling agent, an organic solvent and a resin component.

Fluorescent crayon

An ink composition for an oil marking pen is provided which comprises a coloring agent, an organic polar solvent, an oil-soluble resin and an organically modified silicone as principal components thereof. The organically modified silicone is selected from dimethyl silicone, alkyl-modified silicones, polyether-modified silicones such as a polyoxypropylene modified silicone and the like, and is contained in the ink composition in a proportion of 0.005 wt % to 10 wt %. The organic polar solvent is selected from alcohol solvents and glycol ether solvents. The oil-soluble resin is selected from ketone resins, phenol resins, xylene resins, rosin resins, styrene-organic acid copolymers and polyacrylates. The ink composition of the present invention is excellent in the ink film fixability when applied on a nonabsorbent surface such as a metal surface or a plastic surface, and suitable for oil marking pens.

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Osaka, Japan

Hidetoshi Fukuo