JP2913729B2 - Solid writing implement - Google Patents

Description

The present invention relates to a solid writing instrument such as a pencil lead, a crayon, a pass, and a cosmetic.

(Prior Art) Solid writing implements containing a fluorescent pigment dispersed therein are known.

Generally, fluorescent pigments are acrylic resin, vinyl chloride resin,
It is obtained by kneading a fluorescent dye into a solid solution resin such as a urea resin, a melamine resin, and a benzogamine resin, and then pulverizing the mixture, and using this as a coloring material.

(Problems to be Solved by the Invention) There are no many types of fluorescent pigments. It is not enough to obtain the desired color.

On the other hand, a common use of a coloring material is generally used for adjusting the color tone.

However, when a fluorescent pigment is used, good color may not be obtained simply by using it together with another pigment.

 Take an example.

There is a solid writing implement made so that handwriting is not copied by a dry copying machine. Usually, since a dry copying machine uses a light source distributed on the low wavelength side, a blue writing tool is generally used as a solid writing instrument. When a yellow fluorescent pigment is used in combination, a handwriting that has sufficient coloring is copied, and a coloring that does not copy handwriting is insufficient. It is considered that both the pigment and the fluorescent pigment do not develop color in harmony.

(Means for Solving the Problems) The gist of the present invention is a solid writing implement in which fine particles having a pigment fixed to the surface and a fluorescent pigment each have a particle size of 1 to 20 microns and are dispersed and contained as a colorant. .

 The details will be described below.

The fluorescent pigment may be appropriately used such as those described above. An example of a commercially available product is FZ manufactured by Shinroihi Co., Ltd.
Series, FM series, FP series manufactured by Nippon Shokubai Kogyo Co., Ltd., NKP series, NPI series manufactured by Nippon Fluorescence Co., Ltd. In addition, inorganic and organic pigments may be used as appropriate. Since many are already known, only one example of a blue type based on the above is given. It can also be used as a blue color.

Examples of the fine particles for fixing the pigment on the surface include organic and inorganic fine particles such as polyethylene, polypropylene, nylon, polymethyl methacrylate, polystyrene, glass beads, porous silica, zeolite, alumina beads, and phlogopite mica powder. . Desirably, the pigment has a size of 10 times or more of the pigment to be fixed. To fix, an appropriate blending method or the like may be used as appropriate.Also, an appropriate fixing medium can be used if necessary. However, for reference, Nara Machinery Co., Ltd. utilizing a mechanochemical treatment method is used. The use of a hybridization system is good.

The size after fixing is approximately equal to the size of the fluorescent pigment as described above. The size of a commercially available fluorescent pigment is about 1
Since it is about 20 microns, it is easy to make the size equal to this size. In the present invention, “equivalent” is used to mean “to the extent that one is not covered by the other”.

There are no particular restrictions on what is used or on the manufacturing method.
That is, an appropriately shaped body material such as talc, calcium carbonate, bentonite, potassium titanate, and magnesium oxysulfate, aluminum stearate, and calcium stelate, using various resins and waxes as binders. The fluorescent pigment and the resin fine particle-fixed pigment may be used as compounding materials together with lubricants such as lithium stearate and distearyl ketone, which are used as necessary, and kneading, molding, and heat treatment as necessary.

(Example) Based on the above description, an example in which handwriting is not copied by a dry copying machine will be described through a manufacturing example. However, of course, the solid writing implement of the present invention is not limited to this.

Example 1 part by weight of phthalocyanine blue and 5 parts by weight of titanium oxide were fixed to 30 parts by weight of flow beads LE1080 (polyethylene fine particles manufactured by Sumitomo Seika Co., Ltd .: average particle diameter: 10 μm). Here, the above-mentioned hybridization system was used for fixation.

For 0.5 part by weight of the fine particle fixed pigment thus obtained, 40 parts by weight of nitrocellulose, 10 parts by weight of Epocolor FP-117 (a yellow fluorescent pigment manufactured by Nippon Shokubai Kogyo Co., Ltd.), 5 parts by weight of talc, and 1 part by weight of stearic acid Used, kneaded and molded to obtain a green solid writing implement.

This had good color development, and the handwriting was not copied by a dry copying machine.

Comparative Example In the above example, 1 part by weight of phthalocyanine blue and 5 parts by weight of titanium oxide were used as they were without using flow beads LE1080 (without fixing treatment), and 40 parts by weight of nitrocellulose and Epocolor FP were used. −11
A solid writing implement was obtained in the same manner as in the above example, in combination with 710 parts by weight, 5 parts by weight of talc, and 1 part by weight of stearic acid.

This product had a different color tone from that of the above example, in particular, the fluorescent color was poorly exhibited, and the handwriting was copied by a dry copying machine (at the same level as the above example).

In the same manner as above, the material and size of the fine particles to be used, and the type and amount of the pigment or fluorescent pigment to be used were variously changed, and compared with those used without fixing the pigment to the fine particles. Compared to the case where pigments were used as they were, the use of pigments fixed on the surface of fine particles provided better color tone, especially the fluorescent color, and the non-copyability of handwriting with a dry copier. Was.

(Effect of the Invention) It can be easily obtained as a desired color, and
It can be a solid writing implement that also fully exhibits the desired functions.

Claims (1)

(57) [Claims] 1. A solid writing implement comprising fine particles having a pigment fixed on the surface thereof and a fluorescent raw material each having a particle diameter of 1 to 20 microns and being dispersed and contained as a coloring agent.