JP2002012808A - Nonburnt colored pencil lead - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonburnt colored pencil lead improved in coloring value and flexural strength without impairing its fluorescent color developability. SOLUTION: This nonburnt colored pencil lead essentially comprises a binder, a fluorescent pigment and a pearl pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored pencil lead obtained by molding at least a binder and a coloring material without baking, and more specifically, using a fluorescent pigment as a coloring material, and having a fluorescent coloring property and a coloring power. And a color pencil lead having excellent bending strength.

[0002]

2. Description of the Related Art Conventionally, a non-fired colored pencil lead is generally made of a binder,
Body materials such as talc and calcium carbonate, waxes such as carnauba and paraffin, lubricants such as fatty acids such as calcium stearate and their metal salts, coloring materials such as various inorganic and organic pigments, plasticizers, and organic solvents. It is obtained by kneading with a roll or the like, forming into a core shape by an extruder or the like, and performing a drying treatment as necessary.

[0003] A colored pencil lead that emits a fluorescent color is obtained by using a fluorescent pigment as the coloring material, and most of the fluorescent pigment is produced by dissolving a fluorescent dye in a synthetic resin base and then pulverizing the fluorescent dye. Coloring material. Therefore, the particle size of the fluorescent pigment is as large as about 2 to 5 μm, and the opaqueness is weak and the coloring power is often inferior to that of a normal non-fluorescent organic pigment. Therefore, in order to obtain sufficient coloring power, a large amount of fluorescent pigment is used. However, since the fluorescent pigment is made of a synthetic resin as a base, it is not easy to write as written with a resin stick. In addition to being a core, it does not function as a bonding material, so that the bending strength is reduced. As a method for obtaining a sufficient coloring power without lowering the fluorescent coloring property or bending strength, for example, Japanese Patent Application Laid-Open No. 8-73799 discloses that a fluorescent pigment is used as a coloring material,
A method using 用 い る 1.0% by weight of a non-fluorescent organic pigment of the same hue is described.

[0004]

According to the above prior art,
Although the coloring power is improved, a sufficient core is not obtained in terms of strength, and the fluorescent coloring property is reduced. In addition, tinting strength and fluorescent coloring can be obtained by adjusting wear materials such as constitutional materials, lubricants, and wax, and by making a core that is easy to wear, but the strength is significantly reduced, and a core with a small core diameter is used. In such a case, there arises a problem that practical strength cannot be obtained. That is, at present, a core excellent in all of the fluorescent coloring property, coloring power and bending strength has not been obtained.

[0005]

That is, the present invention provides a non-fired colored pencil lead characterized by containing at least a binder, a fluorescent pigment and a pearl pigment.

The details will be described below. Examples of the binder used in the present invention include nitrocellulose, carboxymethylcellulose, cellulose acetate, cellulose derivatives such as cellulose nitrate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl butyral, polyethylene, epoxy resin, polyvinyl chloride, and vinyl chloride. There are synthetic resins such as vinyl acetate copolymer, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, tragacanth gum, gum arabic, and guar gum, and natural resins, and these may be used alone or in combination of two or more. Can be used.

As the fluorescent pigment used in the present invention, various fluorescent pigments based on benzoguanamine resin, melamine resin, urea resin and the like can be used.
Z-2000, -3040, -5000, -60
00 series, FA-40, and -200 series (all manufactured by Shinloich Co., Ltd.), NKP-4000, -8300, -9200, -9500 / C, -9
600 each series, NKV-S series, NKW-20
00 series (above, manufactured by Nippon Fluorescence Co., Ltd.), T series, GT series (above, manufactured by Daygro Color Co., Ltd.) and the like, and these can be used alone or in combination of two or more. The amount of fluorescent pigment used is
Preferably, it is about 10 to 50% by weight of the total amount. When the amount is less than 10% by weight, the fluorescent coloring property and the coloring power are small. If the content is more than 50% by weight, the core becomes poorly written as written with a resin stick, and does not function as a binder, so that the bending strength tends to be reduced.

The pearl pigment used in the present invention is obtained by coating the surface of lamellar mica particles with a metal oxide having a high refractive index such as titanium oxide or iron oxide. By using a pearl pigment as a part of the core coloring material, the coloring property and the bending strength can be improved without impairing the fluorescent coloring property. Some pearl pigments have an iris color (interference color) or are colored by changing the thickness of the coated titanium oxide or using iron oxide, but the present invention impairs the hue of the fluorescent pigment required. Any pearl pigment can be used unless otherwise specified. The average particle size of the pearl pigment used is 5-6.
It is preferably 0 μm. When the average particle size is less than 5 μm, the improvement in coloring properties is small, and when the average particle size is more than 60 μm, the improvement in bending strength is small.
Further, the use amount of the pearl pigment is preferably 5 to 50% by weight based on the use amount of the fluorescent pigment. If the amount is less than 5% by weight, the improvement in coloring power and strength is small, and if the amount is more than 50% by weight, the coloring of the fluorescent pigment is hindered, and the fluorescent coloring property is slightly reduced. Examples of the pearl pigment used in the present invention include SA-100, SB-100,
SD-100, SE-100, SF-100, SH-1
00, YD-100, RD-100, RBD-100,
VD-100, BD-100, GD-100, RYD-
100, MM-100R, MF-100, MF-100
R, ME-100, ME-100R, MS-100R,
ML-100R, MB-100R, MG-100R, M
R-100R, MV-100R, MRB-100R, M
Y-100R, MDY-100, MRY-100, MC
-303R, MC-500, MC-502, MC-50
4 (manufactured by Topy Industries, Ltd.), Iriodin 10
0, 103, 111, 120, 123, 15
1, 153, 163, 173, 201, 21
1, 221, 223, 231, 205, 21
5, 217, 219, 225, 235, 24
9, 259, 289, 299, 300, 30
2, 303, 306, 309, 320, 32
3, 351, 355, 500, 502, 50
4, 505, 507, 520, 522, 52
4, 530, 532, and 534 (all manufactured by Merck Japan K.K.), and these can be used alone or in combination of two or more.

[0009] If necessary, the coloring material used for toning may be any known inorganic or organic dye or pigment, either alone or in combination of two or more, without impairing the fluorescent coloring properties. Can be used.

As other materials, those conventionally added to a colored pencil lead can be used without any particular limitation.
Examples include talc, calcium carbonate, mica-containing calcium carbonate, magnesium phosphate, barium sulfate, bentonite, kaolin clay, Nε-lauroyl lysine, lauroyl-β-alanine calcium, boron nitride,
Body materials such as fluorinated graphite, fibrous reinforcing materials such as potassium titanate whiskers, calcium carbonate whiskers, titanium dioxide whiskers, aluminum borate whiskers, magnesium sulfate whiskers, calcium sulfate whiskers, paraffin wax, vaseline, microcrystalline wax, and capillaries Waxes such as delila wax, carnauba wax, caster wax, montan wax, polyethylene wax, distearyl ketone, ketone wax, beeswax, wood wax, etc., oils and fats such as lard, hardened tallow oil, hardened fish oil, stearic acid and metal Examples include higher fatty acids such as stearic acid and salts thereof, and plasticizers such as tricresyl phosphate, dimethyl phthalate, diallyl phthalate, dibutyl phthalate, dioctyl phthalate, and propylene carbonate. Doors and the like. Further, as other compounding agents, liquid paraffin, spindle oil, liquid oil such as machine oil, methyl ethyl ketone, acetone,
Solvents such as methyl isobutyl ketone and water.

[0011]

The pearl pigment is a pigment having a transparent silver or iris color due to multi-layer reflection of light or interference of light, and can transmit the color of the fluorescent pigment as a base. In addition, the pearl pigment is a thin plate-like crystal and has good releasability, has the effect of promoting abrasion and improving the coloring power, and is oriented in the longitudinal direction of the core in the core by the orientation action,
Bending strength can be improved. Pearl pigments, in particular, have a much higher strength than ordinary mica because the mica surface is evenly coated with a metal oxide such as titanium oxide. Can be.

[0012]

Examples <Example 1> Nitrocellulose resin (binder) 20 parts by weight Nε-lauroyl lysine (building material) 30 parts by weight Stearic acid (lubricant) 10 parts by weight FZ-2002 (red fluorescent pigment, Shinloich Co., Ltd.) )) 30 parts by weight SD-100 (pearl pigment (average particle size 20 μm), manufactured by Topy Industries, Ltd.) 10 parts by weight Methyl ethyl ketone (solvent) 100 parts by weight Kneading the above materials while adjusting the solvent amount with three rolls. rear,
After extruding into a fine wire, the solvent was removed by drying at 80 ° C. for about 8 hours in a drier to obtain a fluorescent red core having a diameter of 1.3 mm.

<Examples 2 to 5> In Example 1, instead of SD-100, pearl pigment was replaced with SA-100 (average particle size: 3 μm), SB-100 (10 μm), SE-100.
(35 μm) and the same as Example 1 except that SF-100 (70 μm) was used.
m fluorescent red core for mechanical pencil was obtained.

<Embodiments 6 to 9> In Embodiment 1, the SD
A fluorescent red core having a diameter of 1.3 mm was obtained in the same manner as in Example 1, except that the amount of -100 used was changed to 1, 2.5, 14, and 18 parts by weight.

Comparative Example 1 In Example 1, SD-1
A fluorescent red core having a diameter of 1.3 mm was obtained in the same manner as in Example 1 except for excluding 00.

Comparative Example 2 In Example 1, SD-1
A fluorescent red core having a diameter of 1.3 mm was obtained in the same manner as in Example 1 except for using 0.2 parts by weight of Lake Red C (red organic pigment) instead of 00.

Comparative Example 3 In Example 1, SD-1
A fluorescent red core having a diameter of 1.3 mm was obtained in the same manner as in Example 1 except that 10 parts by weight of talc were used instead of 00.

Comparative Example 4 In Example 1, SD-1
A fluorescent red core having a diameter of 1.3 mm was obtained in the same manner as in Example 1 except that mica (average particle size: 20 μm) was used instead of 10 parts by weight except for 00.

Table 1 shows the properties of the non-fired colored pencil leads obtained in the above examples. The bending strength (unit: MPa) is measured according to the measurement method of JIS S6005, and the coloring power is represented by the density of the writing line (unit: D).
It measured according to the measuring method of 6005. The fluorescent coloring property is obtained by irradiating a writing line with a black light and expressing the brightness emitted from the black light in three stages by visual sensory evaluation. The larger the value, the more the light is emitted.

[0020]

[Table 1]

[0021]

As described above, the present invention provides a fluorescent coloring property,
A colored pencil lead excellent in both coloring power and bending strength can be provided.

Claims (3)

[Claims] 1. A non-fired color pencil lead comprising at least a binder, a fluorescent pigment, and a pearl pigment. 2. The pearl pigment has an average particle size of 5 to 60 μm.
2. The non-fired colored pencil lead according to claim 1, wherein m is m. 3. The non-fired color pencil lead according to claim 1, wherein the amount of the pearl pigment used is 5 to 50% by weight based on the amount of the fluorescent pigment used.