JP2003041177A - Unburned color pencil lead - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide unburned color pencil lead having high strength of lead body and having golden gloss and vividness in the handwriting. SOLUTION: This unburned color pencil lead comprises at least binder, scaly bronze powder and an yellow-based organic pigment. In the unburned color pencil lead, the content of the scaly bronze powder is 30-70 wt.% and the average particle diameter of the powder is 3-30 μm and the content of the yellow- based organic pigment is 1-15 wt.% based on the scaly bronze powder.

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 blending at least a binder and scale-like bronze powder, molding after kneading and without firing, and more specifically, while having high strength. The present invention relates to a colored pencil lead whose handwriting has a golden luster.

[0002]

2. Description of the Related Art Conventionally, a non-fired colored pencil lead is generally used as a binder, an extender such as talc or calcium carbonate, a wax such as carnauba or paraffin, a lubricant made of an aliphatic metal salt such as calcium stearate, various inorganic materials, A colorant such as an organic pigment, a plasticizer, an organic solvent, etc. are kneaded in a three-roll mill or the like and molded into a core by an extruder or the like.
It is obtained by subjecting it to a drying treatment if necessary.

Further, as a method for producing a colored pencil lead having a golden luster in the handwriting, bronze powder is used, or as described in Japanese Patent Publication No. 34-1374, aluminum powder and pigment are combined. A method of visually presenting a golden color is known.

[0004]

The quality characteristics of a colored pencil lead in which the handwriting has a golden luster include, of course, that the handwriting is visually golden, the strength of the core, the glossiness of the handwriting, Three types of quality characteristics, that is, the vividness of handwriting, are required. However, the color pencil lead obtained by the conventionally known technique does not satisfy all the above quality characteristics. For example, when a colored pencil lead having a golden luster with handwriting is manufactured by combining aluminum powder and a pigment, if the amount of the pigment used is small, the tint becomes visually silvery, and conversely the amount of the pigment is changed. If the amount is increased, the problem that the glossiness is lowered occurs. From this fact, it is most preferable to use the bronze powder when producing a colored pencil lead having handwriting with a golden luster. However, with a colored pencil lead made of bronze powder, the handwriting was visually dark and easily visible, and the vividness was low.

In view of the above problems, the present inventor satisfied all the quality characteristics of the strength of the core, the glossiness of the handwriting, and the vividness of the handwriting in a colored pencil lead whose handwriting using bronze powder has a golden luster. As a result of intensive research and development to provide a colored pencil lead, the content and average particle size of the bronze powder in the core of the colored pencil lead are controlled, and further an appropriate amount of a yellow organic pigment is contained. Thus, the present invention has been achieved by obtaining a completely new finding that the above-mentioned quality characteristics can be improved at the same time.

[0006]

That is, the present invention is a non-fired colored pencil lead containing at least a binder, a scaly bronze powder and a yellow organic pigment, wherein the scaly bronze powder is:
The content is 30 to 70% by weight, the average particle size is 3 to 30 μm, and the content of the yellow organic pigment is 1 to 15% by weight based on the scale-like bronze powder. The gist is a non-fired colored pencil lead.

The details will be described below. The scale-like bronze powder used in the present invention is used for making the handwriting golden luster, and the amount used is 30 to 7 with respect to the total amount of colored pencil cores.
It is required to be 0% by weight and the average particle diameter thereof should be 3 to 30 μm. If the amount used is less than 30% by weight, the scaly bronze powder will be sparsely present in the coating film when writing with the core, and there will be gaps between the scaly bronze powder to form a uniform glossy surface. It cannot be formed, and it looks visually dark and has low gloss and vividness. Further, when the amount used is more than 70% by weight, glossiness is obtained, but the core becomes brittle and has low strength. Furthermore,
When the average particle size is less than 3 μm, the orientation of the scale-like bronze powder in the writing film is deteriorated, and the scale-like bronze powder is disturbed in the writing film, so that it is visually dark and has low vividness. Will be. The average particle size is 30μ
If it exceeds m, gaps are likely to be formed between the scale-like bronze powder in the handwriting coating film, and it appears visually darkened, and the gloss and vividness are lowered, and the core body is reduced in compactness, brittleness and strength. It will be low.

The average particle size of the scale-like bronze powder in the present invention refers to the median size (D ₅₀ ) of the particle size distribution measured by a laser diffraction type particle sizer.

The flaky bronze powder used in the present invention is
It is a metal powder pigment having copper and zinc as main components and having a golden luster, and bronze powder and gold powder that are usually commercially available can be used. In order to make the average particle diameter of the scale-like bronze powder in the core of the non-sintered colored pencil of the present invention 3 to 30 μm,
For example, among the following commercially available scale-like bronze powders, those having an average particle size of about 3 to 30 μm may be used alone, or several types of scale-like bronze powders may be used in combination to obtain an average particle size of 3 to 30 μm. You may adjust and use it so that it may become. In any case, the scale-like bronze powder is used by appropriately adjusting the average particle diameter of the scale-like bronze powder in the core body to be 3 to 30 μm when finally made into a core.

An example of the scale-like bronze powder used in the present invention is No. 7770 (3 μm), No. 700
0 (5 μm), No. 700 (7 μm), No. 70
(10 μm), 4L7 (15 μm), 3L7 (20 μm
m), 2L7 (25 μm), L7 (30 μm), E7
(35 μm), G7 (40 μm), No. 5550 (3
μm), No. 5000 (5 μm), No. 500 (7
μm), No. 50 (10 μm), 4L5 (15 μ
m), 3L5 (20 μm), 2L5 (25 μm), L5
(30 μm), E5 (35 μm), G5 (40 μm),
HRS70 (35 μm), HRS170 (30 μm),
HRS270 (25 μm), HRS50 (35 μm),
HRS150 (30μm), HRS250 (25μ
m), E7-R (35 μm), E5-R (35 μm),
Flake-shaped bronze powder such as 3L Copper (20 μm) (above, manufactured by Fukuda Metal Foil & Powder Co., Ltd.), BS-110
7 (3 μm), BS-937B (10 μm), BS-6
07 (14 μm), BS-107 (47 μm), BS-
1105 (3 μm), BS-935B (10 μm), B
Scale-like bronze powder such as S-605 (14 μm) and BS-105 (47 μm) (above, Toyo Aluminum Co., Ltd.)
Manufactured), # 7000, # 1007, # 277, # 91, W
-47, # 31, # 21, AE-7, # 5000, # 1
005, # 275, # 93, W-45, # 33, # 2
3, scaly bronze powder such as AE-5 (above, manufactured by Nakajima Metal Foil & Powder Co., Ltd.) and the like can be mentioned, and these can be used alone or in combination of two or more kinds.
The value in parentheses represents the average particle size.

The yellow organic pigment used in the present invention is used for visually softening the blackening of the scale-like bronze powder. This is because while the average particle diameter of the scale-like bronze powder used is 3 to 30 μm, most of the yellow organic pigments have small particles of about 0.01 to 1 μm. This is because it is easy to fill the gaps in, and the darkening is visually erased to obtain vivid handwriting. The amount of the yellow organic pigment used is preferably 1 to 15% by weight based on the amount of the flaky bronze powder used. If it is less than 1% by weight, there is little improvement in vividness,
This is because if the amount is more than 15% by weight, the surface of the scale-like bronze powder is covered with the organic pigment and the glossiness is lowered. Examples of yellow organic pigments include Fast Yellow G,
Same 10G, same FGL, same ER, etc. monoazo type, disazo yellow HR etc. disazo type, condensed azo yellow 3
Condensed azo type such as G, metal complex acid azomethine type such as copper azomethine yellow 117, benzimidazolone type such as benzimidazolone yellow H4G, isoindolinone type such as isoindolinone yellow 2GLT, anthrapyrimidine type, flavantron type Conventionally known various yellow organic pigments such as quinophthalone type can be used.

Examples of the binder used in the present invention include cellulose derivatives such as carboxymethyl cellulose, nitrocellulose, cellulose acetate and cellulose nitrate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl butyral, polyethylene, epoxy resin, polyvinyl chloride, There are synthetic resins such as vinyl chloride-vinyl acetate copolymer, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, tragacanth gum, gum arabic, and guar gum, natural resins, etc. The above can be used in combination.

The non-fired colored pencil lead of the present invention can be obtained by a conventionally known method. For example, a method may be employed in which the above essential components are blended, kneaded with a three-roll mill or a Hensyl mixer, molded into a core by an extruder or the like, and then dried if necessary. However, when a kneader having a mechanical share such as a three-roll mill is used in the kneading step in the manufacturing process, the scale-like bronze particles are partially broken, and the particle size distribution tends to shift toward a smaller particle size. is there. For example, when a compounded material mixed with a solvent is applied to a three-roll mill while adjusting the amount of the solvent, the average particle size of the scale-like bronze powder depends on the type and amount of other compounds, but is more than that at the time of compounding. The average particle size tends to be about 80%. In this case, the scale-like bronze powder to be used may be appropriately selected in consideration of the decrease in the average particle size.

In the non-sintered colored pencil lead of the present invention, various additives can be used in addition to the above essential components. For example, it is also preferable to use aluminum soap. When aluminum soap is used in combination with scale-like bronze powder, it greatly improves the wear resistance, making it difficult to form gaps between scale-like bronze particles, and the vividness and glossiness of the handwriting are significantly improved. Has been. The amount of the aluminum soap used is preferably about 3 to 20% by weight based on the total amount of the compound of the colored pencil lead. This is because if it is less than 3% by weight, the abrasion resistance is not improved so much, and if it exceeds 20% by weight, the core becomes soft and the strength is lowered. Examples of aluminum soaps include aluminum stearate, aluminum palmitate, aluminum oleate and the like.

In addition to the above-mentioned yellow organic pigments, as a coloring material used for toning as necessary, known dyes of various types, inorganic or organic, may be used as long as they do not impair the luster of gold. The pigments can be used alone or in combination of two or more kinds.

As other materials, those conventionally added to colored pencil leads can be used without particular limitation.
As an example, talc, calcium carbonate, mica-containing calcium carbonate, magnesium phosphate, barium sulfate, mica, bentonite, kaolin clay, Nε-lauroyl lysine, lauroyl-β-alanine calcium, boron nitride, fluorinated graphite and other constitutions. Materials, potassium titanate whiskers, calcium carbonate whiskers, titanium dioxide whiskers, aluminum borate whiskers, magnesium sulfate whiskers, calcium sulfate whiskers and other fibrous reinforcing materials, paraffin wax, petrolatum, microcrystalline wax, caderilla wax, carnauba wax, Castor wax, montan wax, polyethylene wax, distearyl ketone, ketone wax,
Waxes such as beeswax, wood wax, lard, hardened tallow oil,
Fats and oils such as hardened fish oil and higher fatty acids such as stearic acid and metallic stearic acid and salts thereof can be mentioned. As a plasticizer, tricresyl phosphate, dimethyl phthalate, diallyl phthalate, dibutyl phthalate, dioctyl phthalate, propylene carbonate, etc. Is mentioned. Further, as other compounding agents, liquid oil such as liquid paraffin, spindle oil, machine oil, methyl ethyl ketone, acetone,
Examples include solvents such as methyl isobutyl ketone and water.

[0017]

In the non-fired colored pencil lead of the present invention, the content of the scaly bronze powder in the core is 30 to 70% by weight, and
Since the average particle diameter of the scale-like bronze powder is 3 to 30 μm, it is an ideal coating structure having a vivid and high gloss, there are no gaps between the scale-like bronze particles, and the coating surface has few irregularities. A uniform and smooth coating film can be obtained. Furthermore, by adding a yellow organic pigment in an amount of 1 to 15% by weight based on the amount of the scale-like bronze powder used, the gaps between the scale-like bronze particles can be filled and the vividness can be greatly improved.

[0018]

【Example】

After kneading the above materials with a three-roll mill while adjusting the amount of solvent, extrusion-molding into a fine wire, and drying at 80 ° C for about 8 hours to remove the solvent, and have a golden luster of 1.3 mm in diameter. I got a colored pencil lead. The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 13.0 μm.

<Example 2> In Example 1, the bronze powder 4L7 was replaced with bronze powder No. A colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained in the same manner as in Example 1 except that the number was changed to 7,000 (manufactured by Fukuda Metal Foil & Powder Co., Ltd .; average particle size 5 μm). The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 4.2 μm.

<Example 3> In Example 1, bronze powder 4L7 was replaced with bronze powder L7 (Fukuda Metal Foil & Powder Co., Ltd.).
Manufactured in Example 1 except that the average particle size was changed to 30 μm)
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle size of the scale-like bronze powder contained in the colored pencil lead was 25.5 μm.

Example 4 All of Example 1 except that the amount of bronze powder 4L7 used was 35 parts by weight and the amount of Nε-lauroyl lysine used was 40 parts by weight.
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle size of the scaly bronze powder contained in the colored pencil lead was 13.2 μm.

<Example 5> In Example 1, except that the amount of bronze powder 4L7 used was 65 parts by weight and the amount of Nε-lauroyl lysine used was 10 parts by weight.
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 12.9 μm.

Example 6 A colored pencil lead having a golden luster of 1.3 mm in diameter was obtained in the same manner as in Example 1 except that the amount of the first yellow 10G used was 6 parts by weight. . The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 13.0 μm.

<Example 7> The procedure of Example 1 was repeated except that 7 parts by weight of calcium stearate was used instead of 7 parts by weight of aluminum stearate, and a golden luster having a diameter of 1.3 mm was obtained. I got a colored pencil lead. The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 12.9 μm.

<Comparative Example 1> In Example 1, the bronze powder 4L7 was replaced with the bronze powder No. A colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained in the same manner as in Example 1 except that it was changed to 7770 (Fukuda Metal Foil & Powder Co., Ltd .; average particle diameter 3 μm). The average particle diameter of the scale-like bronze powder contained in the colored pencil lead was 2.5 μm.

<Comparative Example 2> In Example 1, bronze powder 4L7 was replaced with bronze powder G7 (Fukuda Metal Foil & Powder Co., Ltd.).
Manufactured in Example 1 except that the average particle diameter was changed to 40 μm)
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle size of the scaly bronze powder contained in the colored pencil lead was 35.0 μm.

<Comparative Example 3> In Example 1, except that the amount of bronze powder 4L7 used was 25 parts by weight and the amount of Nε-lauroyl lysine used was 50 parts by weight.
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle size of the scaly bronze powder contained in the colored pencil lead was 13.2 μm.

<Comparative Example 4> The procedure of Example 1 was repeated except that the amount of the bronze powder 4L7 used was 75 parts by weight and Nε-lauroyl lysine was not used. A colored pencil lead having a golden luster was obtained. The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 12.9 μm.

<Comparative Example 5> In Example 1, the bronze powder 4L7 was replaced with the bronze powder No. 7770 (manufactured by Fukuda Metal Foil & Powder Co., Ltd .; average particle size 3 μm), and the amount used was 25 parts by weight, and the amount used of Nε-lauroyl lysine was 50 parts by weight, and all were the same as in Example 1. In the same manner, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. still,
The scale-like bronze powder contained in the colored pencil lead had an average particle diameter of 2.6 μm.

Comparative Example 6 Example 1 is the same as Example 1 except that Fast Yellow 10G is not used.
In the same manner as above, a colored pencil lead having a diameter of 1.3 mm and having a golden luster was obtained. The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 13.0 μm.

Comparative Example 7 A colored pencil lead having a golden luster of 1.3 mm in diameter was obtained in the same manner as in Example 1 except that the amount of the first yellow 10G used was 10 parts by weight. . The average particle diameter of the scaly bronze powder contained in the colored pencil lead was 13.1 μm.

<Comparative Example 8> The procedure of Comparative Example 5 was repeated except that Fast Yellow 10G was not used and 7 parts by weight of calcium stearate was used instead of 7 parts by weight of aluminum stearate. 1.
A colored pencil lead having a golden luster of 3 mm was obtained. The average particle diameter of the scale-like bronze powder contained in the colored pencil lead was 2.5 μm.

With respect to the non-fired colored pencil cores obtained in the above Examples and Comparative Examples, the bending strength (unit: MPa) as a substitute characteristic of the strength of the core body, and the glossiness of the handwriting (unit :)
%), Saturation as a substitute characteristic of handwriting vividness (unit:
None) was measured. The results are shown in Table 1.

The bending strength (unit: MPa) of the core is JI
It measured according to the measuring method of S S6005. Regarding the glossiness (unit:%) of the handwriting, a sample piece was prepared by coating each of the above-mentioned non-burning colored pencil leads on Kent paper with a load of 600 g so that there was no gap, and according to JIS Z8741-1983 -300A (Nippon Denshoku Industries Co., Ltd.)
Manufactured by K.K.) to measure the 60-degree specular gloss. The larger the gloss value, the higher the metallic gloss. The saturation of the handwriting (unit: none) is the spectrocolorimeter CM-3 for the sample piece used to measure the glossiness.
The C value (saturation) was measured using 700d (manufactured by Minolta Co., Ltd.). The higher the saturation value, the more vivid the tint.

[0035]

[Table 1]

[0036]

As described above, the non-fired colored pencil lead according to the present invention can provide a colored pencil lead having a golden luster excellent in the strength of the core, the glossiness of the handwriting and the vividness.

Claims (2)

[Claims] 1. A non-sintered colored pencil lead containing at least a binder, a scaly bronze powder and a yellow organic pigment, wherein the scaly bronze powder has an average particle size of 30 to 70% by weight. Is 3 to 30 μm, and
The yellow organic pigment has a content of 1 to 15% by weight based on the scale-like bronze powder. 2. The non-baked colored pencil lead according to claim 1, further comprising aluminum soap.