JP2003221544A - Solid drawing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid drawing material having an excellent strength and an excellent color-developing property. <P>SOLUTION: This solid drawing material comprising a binder such as clay or a resin, for example, nitrocellulose, a coloring material such as an inorganic pigment or an organic pigment, and an extender is characterized in that the extender contains platy alumina having an average particle diameter of 0.5 to 20 μm and an aspect ratio of 10 to 80 in an amount of 2 to 30 wt.% based on the total amount of the solid drawing material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crayon, a pastel, a solid correction tool, a colored pencil lead, and the like. The present invention relates to a solid drawing material that wears and attaches a coloring material to a drawing object to form a drawing trace.

[0002]

2. Description of the Related Art Generally, solid drawing materials such as crayons, pastels, solid correction tools, and colored pencil leads are coloring materials such as organic pigments and inorganic pigments, and binders such as clay, organic bentonite, carboxymethyl cellulose, and polyethylene resin. And a body material such as talc, mica, calcium carbonate, and an abradability-imparting material such as carnauba wax, polyethylene wax, and oils and stearic acid are kneaded, and water and a solvent such as methyl ethyl ketone (MEK) are added as necessary. It is obtained by molding

In addition, in the case of a colored pencil lead, particularly in recent years, as a thin lead for a mechanical pencil, a talc or boron nitride is used in combination with a clay binder such as bentonite, kaolin or clay and an organic binder such as vinyl chloride resin. In a colored pencil lead that is colored by impregnating a dye etc. into a white sintered core obtained by heat-treating while adjusting the atmosphere using a body material such as A white sintered core with improved strength by generating multiple layers of silicon nitride skeleton in the pores formed by scattering the organic binder by heat treatment by immersing it in a xylene solution of polysilazane several times and performing heat treatment. There has been proposed a colored pencil lead in which a body is formed and a dye is impregnated into this white sintered core.

Such a solid drawing material is one in which the solid drawing material itself adheres to or is fixed on the paper surface by abrasion to develop a color, and if a larger amount of colored powder is abraded from the solid drawing material, a good color is obtained. To be However, accelerating the abrasion property for improving the color developability has a problem that the strength of the molded product becomes weak. For example, although the color development of the colored pencil lead obtained by the method of suppressing the amount of the resin used to make the colored pencil lead itself soft and easy to wear is certainly improved,
A phenomenon occurs in which the strength becomes weak and the material easily breaks.

In order to obtain a solid drawing material having a coloring property without deteriorating the strength of the solid drawing material, it is important to control the largest particle as a coloring particle especially when it is worn out such as talc and calcium carbonate. Various studies have been carried out to obtain a structure in which these materials can be easily separated from the solid drawing material without impairing the strength of the material. For example,
JP-B-62-26354 discloses that the bending strength of the pencil lead and the color tone of the handwriting are improved by making the average particle diameter of the extender material in the pencil lead fine. However, although the bending strength is certainly improved, since the fine body material is used, the core body becomes dense, and eventually, it becomes hard and hard to wear,
The current situation is that the task of improving both strength and color developability has not been fully achieved.

[0006]

As described above, it is extremely difficult to improve both the strength and the color developability, and a solid drawing material having good colorability while having practically sufficient strength is used. There is a problem that cannot be obtained.

[0007]

That is, the present invention provides a solid drawing material using at least a binder, an extender and a coloring material, wherein the extender has an average particle size of at least 0.5 to 2.
A gist of the solid drawing material is characterized by containing a plate-like alumina having a thickness of 0 μm and an aspect ratio of 10 to 80.

The present invention will be described in detail below. In the present invention, the plate-like alumina has an average particle size of 0.5 μm.
.About.20 .mu.m and an aspect ratio of 10 to 80 are required. The average particle size of the plate-shaped alumina has a great influence on the denseness of the structure of the solid drawing material and the amount of wear, and if the average particle size is less than 0.5 μm, the packing effect in the solid drawing material makes it more dense. If the thickness is larger than 20 μm, the structure becomes a structure and the effect of promoting wear cannot be obtained. Will be low. Further, the aspect ratio of the plate-like alumina has a great influence on the orientation of the plate-like alumina in the solid drawing material and the releasability from the solid drawing material, and if the aspect ratio is less than 10, the particle shape is irregular. Since the orientation of the plate-like alumina in the solid drawing material becomes low, it becomes difficult to improve the strength of the solid drawing material, and the peelability from the solid drawing material also decreases, resulting in less wear. Will end up. When the aspect ratio is larger than 80, the strength of the plate-shaped alumina itself is lowered, the plate-shaped structure is deformed / broken in the solid drawing material, and the orientation and the peeling property are lowered. The aspect ratio of the plate-like alumina varies depending on the average particle diameter, but it is more preferably 40 to 80. Further, the amount of the plate-like alumina used is preferably 2 to 30% by weight based on the total amount of the solid drawing material. If the amount used is less than 2% by weight, it is difficult to obtain the effect of improving the strength due to the orientation of the plate-like alumina and the amount of wear due to the peelability as described above, and if the amount is more than 30% by weight. However, the solid drawing material becomes too hard and hard to wear, or the orientation becomes too high, and cracks are likely to occur along the orientation direction. A hydrothermal synthesis method using aluminum hydroxide is generally used as a method for producing the plate-shaped alumina, and a commercially available product is Seraph YFA006.
10 (average particle diameter 0.6 μm, aspect ratio 10), Seraph YFA02025 (average particle diameter 2 μm, aspect ratio 25), Seraph YFA02050 (average particle diameter 2 μ)
m, aspect ratio 50), Seraph YFA05025 (average particle diameter 5 μm, aspect ratio 25), Seraph YFA0
5070 (average particle diameter 5 μm, aspect ratio 70), Seraph YFA10030 (average particle diameter 10 μm, aspect ratio 30) (above, manufactured by YKK Corporation) and the like.

As the material of the solid drawing material used in the present invention, in addition to the above-mentioned plate-like alumina, a resin, clay, organic bentonite, which is a binder for shaping, and a coloring material are used as essential components. If necessary, mix and use body materials other than plate-like alumina such as talc and calcium carbonate, various waxes for applying colorants to the paper surface, and abrading properties such as oils and fats such as stearic acid. You can

The binder used in the present invention includes clay, organic bentonite and resin. The resin is not particularly limited, and specifically, polystyrene, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polystyrene butadiene, polyvinyl chloride, polyvinyl acetate, polymethyl acrylate, polymethyl methacrylate, polyvinylidene chloride,
Polytetrafluoroethylene, acrylic-styrene resin, acrylonitrile butadiene styrene resin, ethylene-tetrafluoroethylene copolymer, nitrocellulose, ethyl cellulose, methyl cellulose, cellulose acetate, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, polypropylene glycol, polyacrylamide, poly Examples thereof include acrylic acid, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl ether, maleic acid polymer, polyester polyol resin, polyester polyether resin, polyethylene terephthalate, polybutylene terephthalate and the like. These may be used alone or in combination of two or more.

The colorant used in the present invention is not particularly limited, and various natural and synthetic dyes and various inorganic and organic pigments can be arbitrarily used. As the dye, Japanol Fast Black D Conc (C.I.
Direct Black 17), Water Black 100
L (same 19), water black 200-L (same 1)
9), Water Black # 7 (19), Kayaset Black W9 (19), Direct Fast Black B (22), Direct Fast Black AB (3)
2), Direct Deep Black EX (38 same), Direct Deep Black (38 similar product), Direct Fast Black Conc (51 same), Kayaras Supra Ray VGN (71 same), Kayak Direct Brilliant Yellow G (CI) Direct Yellow (12 same), Direct Fast Yellow 5GL (26 same), Eisen Primula Yellow GCLH (44 same), Direct Fast Yellow R (50 same), Eisen Direct Fast Red FH (CI Direct Red 1), Nippon Fast Scarlet GSX (4), Direct Fast Scarlet 4BS (23), Eisen Direct Durin BH (31), Direct Scarlet B (37), Kayak Direct Scarlet 3B (3)
9), Eisen Primula Binconk 2BLH (7
5), Sumilite Red F3B (80), Eisen Primula Red 4BH (81), Kayaras Sprarubin BL (83), Kayaras Light Red F5G (22)
5), Kayaras Light Red F5B (same 226), Kayaras Light Rose FR (same 227), Direct Sky Blue 6B (CI Direct Blue 1), Direct Sky Blue 5B (same 15), Benzo Brilliant Sky Blue 8GS (41 same), Sumilite Supra Blue BRR Conch (71 same), Dibogen Turquoise Blue S (86 same), Water Blue # 3 (86 same), Kayala Star Coise Blue GL (86 same), Daiwa Blue 215H ( Same as 87), Kayaras Sprawl Blue FFRL
(Same as 108), Kayaras Sproll Blue FF2GL (Same as 106), Kayaras Spractor Coise Blue FBL
(Ibid. 199), etc. and acid blue black 1
0B (CI Acid Black 1), Nigrosine (2), Water Black R455 (2), Water Black R510 (2), Suminol Milling Black 8BX (24), Kayanol Milling Black V
LG (26), Kyanol Milling Black BR Conc (31), Mitsui Nylon Black GL (5)
2), Eisen Opal Black WH Extra Conc (52), Sumilan Black WA (52), Raunyl Black BG Extra Conc (107), Kayanol Milling Black TLB (109), Suminol Milling Black B (same) 109), Kayanor Milling Black TLR (110 same), Eisen Opal Black New Conc (119 same), Water Black 18
7-L (154), Acid Yellow # 10 (C.I.
I. Acid Yellow 1), Kayaku Acid Brilliant Flavin FF (7: 1), Kayasil Yellow CG (1)
7), Xylene Light Yellow 2G 140% (17),
Suminol Leveling Yellow NR (19 same), Water Yellow # 1 (23 same), Daiwa Dadrazine (2 same)
5), Kayactorazine (23), Suminol Fast Yellow R (25), Diacid Light Yellow 2
GP (29), Suminol Milling Yellow 0 (3)
8), Suminol Milling Yellow MR (42), Water Yellow # 6 (42), Kayanor Yellow NF
G (49), Suminol Milling Yellow 3G (7)
2), Suminol Fast Yellow G (same as 61), Suminol Milling Yellow G (same as 78), Kayanol Yellow N
5G (110 same), Suminol Milling Yellow 4G20
0% (141 same), Kayanor Yellow NG (13 same)
5), Kayanor Milling Yellow 5GW (127),
Kaya Knoll Milling Yellow 6GW (142), Sumitomo Fast Scarlet A (CI Acid Red 8), Kayak Silk Scarlet (9), Solar Rubin Extra (14), Daiwa New Koksin (18), Water Scarlet (18), Daiwa Red No. 102 (18), Aizen Bonso RH (2)
6), Daiwa Red No. 2 (27), Suminol Leveling Brilliant Red S3B (35), Kayasil Rubinol 3GS (37), Eisen Erythrosin (5)
1), Kayaqua Acid Rhodamine FB (52), Daiwa Red No. 106 (52), Suminol Leveling Rubinol 3GP (57), Diacid Alizarin Rubinol F3G 200% (82), Alizarin Rubinol 5G (82). 83), Aizeneocin GH (87 same), Water Red # 2 (87 same), Daiwa Red 103WB
(Same as 87), Water Pink # 2 (Same as 92), Aizen Acid Phloxine PB (Same as 92), Daiwa Red 104
No. (92), Rose Bengal (94), Kyanol Milling Scarlet FGW (111), Kyanol Milling Rubin 3BW (129), Suminol Milling Brilliant Red 3BN Conc (131), Suminol Milling Brilliant Red BS (same 138),
Eisen Opal Pink BH (same 186), Suminol Milling Brilliant Red B Conc (same 249), Kayak Acid Brilliant Red 3BL (same 254),
Kayaqua Acid Brilliant Red BL (265),
Kayanol Milling Red GW (same as 276), Mitsui Acid Violet 6BN (same as 17), Water Violet # 1 (same as 49), Ink Violet L10
(Id. 49), Sumitomo Patent Pure Blue VX (C.
I. Acid Blue 1), Water Blue # 106
(Same 1), Patent Blue AF (Same 7), Water Blue # 9 (Same 9), Daiwa Blue No. 1 (Same 9), Ink Blue L20 (Same 9), Splanol Blue B (Same 1).
5), Water Blue # 116 (15), Orient Sulblue Blue OBX (22), Suminol Leveling Blue 4GL (23), Mitsui Nylon Fast Blue G (25), Kayasil Blue AGG (4)
0), Kayacil Blue BR (41), Mitsui Alizarin Sapphirole SE (43), Suminol Leveling Sky Blue R Extraconc (62), Mitsui Nylon Fast Sky Blue R (78), Sumitomo Brilliant Indocyanine 6Bh / e (same as 83), Sandlancyanin N-6B 350% (same as 90), Water Blue # 105 (same as 90), Orient Solble Blue OBB (same as 93), Splanol cyanine 7BF (same as 100), Sumitomobrilliant Blue 5G (Ibid 10
3), Acid Blue (103), Asilane Brilliant Blue FFR (104), Kyanol Milling Ultra Sky SE (112), Kyanol Milling Cyanine 5R (113), Aizen Opal Cyanine 2
GLH (158), Daiwa Guinea Green B (C.
I. Acid Green 3), Acid Brilliant Milling Green (9), Daiwa Green # 70 (1)
6), Kayanol Cyanine Green G (same as 25), Suminol Milling Green G (same as 27), Water Orange # 17 (C.I. Acid Orange 56), and other acid dyes such as Water Yellow # 2 (C.I. Food Yellow 3), Food Yellow No. 5 (CI Food Yellow 3), Food Red No. 3 (CI Food Red 14), Food Blue No. 2 (CI Acid Blue 74), Food green 2
No. (CI Acid Green 5) and other food dyes, Malachite Green (CI 42000), Victoria Blue FB (CI 44045), Methyl Violet FN (CI 42535), Rhodamine F4G ( C.
I. 45160), Rhodamine 6GCP (C.I.45
And basic dyes such as 160).

As the pigment, Special Black
6, S170, S610, S5, S4, S4A, S550, S35, S250, S100, Printex
150T, U, V, 140U, 140V, 95, 90, 85, 80, 75, 55, 4
5, same P, same XE2, same L6, same L, same 300, same 3
0, the same 3, the same 35, the same 25, the same 200, the same A, the same G (above, manufactured by Degussa Japan KK), # 2400B, # 2.
350, # 2300, # 2200B, # 1000, # 9
50, # 850, # MCF88, MA600, MA10
0, MA7, MA11, # 50, # 52, # 45, # 4
4, # 33, # 32, # 30, CF9, # 20B, # 4
000B (above, Mitsubishi Kasei Co., Ltd.), MONARCH
1300, 1100, 1000, 900, 8
80, 800, 700, MOGUL L, REGA
L 400R, 660R, 500R, 330R,
300R, 99R, ELFTEX 8, 12 and B
LACK PERALS 2000 (above, manufactured by Cabot Co. LTD in the United States), Raven 7000, 57
50, 5250, 5000, 3500, 200
0, same 1500, same 1255, same 1250, same 120
0, 1170, 1060, 1040, 103
5, 1020, 1000, 890H, 890,
850, 790, 780, 760, 500,
Same 450, same 430, same 420, same 410, same 22, 22, same 16, same 14, same 825 Oil Beads, same H2
Carbon blacks such as 0, C, Conductex 975, 900, SC (above, Columbian Carbon Japan Co., Ltd.), KA-10, 10P, 1
5, the same 20, the same 30, the same 35, the same 60, the same 80, the same 9
0, KR-310, 380, 460, 480 (above, manufactured by Titanium Industry Co., Ltd.), P25 (manufactured by Nippon Aerosil Co., Ltd.) and the like, BS-605, 607.
(Above, manufactured by Toyo Aluminum Co., Ltd.), bronze powder P-
555 and P-777 (Nakajima Metal Foil Industry Co., Ltd.)
Powder), bronze powder 3L5, 3L7 (manufactured by Fukuda Metal Foil Industry Co., Ltd.), black iron oxide, yellow iron oxide, red iron oxide, ultramarine blue, dark blue, cobalt blue, chrome green. , Inorganic pigments such as chromium oxide, Hansa Yellow-10G, 5G, 3G, 4 and GR,
Same A, Benzidine Yellow, Permanent Yellow NCC
G, Tartrazine Lake, Quinoline Yellow, Sudan 1, Permanent Orange, Induslen Brilliant Orange GN, Permanent Brown FG, Para Brown, Fire Red, Brilliant Carmine 6B, Bordeaux 5B, Thioindigo Red, Fast Violet B, Dioxane Violet, Alkali Organic pigments such as blue lake, phthalocyanine blue, indigo, acid green lake, phthalocyanine green and the like can be mentioned. In addition to these, inorganic fluorescent pigments such as zinc sulfide, zinc silicate, cadmium zinc sulfate, calcium sulfide, strontium sulfide, and calcium tungstate can be cited.

As the extender used in the present invention, the above-mentioned plate-like alumina may be used alone, or conventionally known extender may be used in addition to the plate-like alumina without any particular limitation. Specifically, talc, mica, kaolin clay, bentonite, Nε-lauroyl lysine, various metal salts of N-lauroyl-β-alanine, calcium carbonate,
Magnesium carbonate, magnesium sulfate, boron nitride and potassium titanate whiskers, calcium carbonate whiskers, titanium dioxide whiskers, magnesium sulfate whiskers, calcium sulfate whiskers, aluminum sulfate whiskers, and the like as fibrous substances can be used alone or in combination of two or more. You may use together.

In the present invention, in addition to the above, natural waxes such as carnauba wax, beeswax, and wood wax, synthetic waxes such as polyethylene wax, montan wax, paraffin wax, zinc stearyl ketone, and microcrystalline wax, Abrasive agents such as various metal salts of stearic acid such as stearic acid, aluminum stearate, magnesium stearate, calcium stearate, etc., and if necessary, diallyl phthalate, dimethyl phthalate, butylphthalyl butyl glycolate, propylene carbonate, etc. Plasticizers and the like can be used.

In the present invention, as the solid drawing material, the above-mentioned compounding materials are arbitrarily compounded, and a polar solvent such as water, MEK or alcohol, or a nonpolar solvent such as toluene is optionally used depending on the characteristics of the binder used. While the Hencil mixer,
It is molded after stirring, crushing, and kneading with a ball mill, three-roll mill, etc. A method in which a crayon, a pass, and the like are put into a mold while being heated and melted, and then cooled and molded can be adopted. Furthermore, in the case of a colored pencil lead, etc., a material with a slight amount of solvent remaining is loaded into a cylinder for a vertical extruder, and the material inside the cylinder is extruded by a hydraulic piston, and a dryer is used for the organic solvent contained. An existing method such as forced drying can be used to perform molding.

[0016]

The plate-like alumina used in the present invention is a rhombohedral α-alumina particle, which is a plate-like particle which is extremely thin and has a high aspect ratio as compared with commonly used extenders. The shape is also uniform. This is a property peculiar to alumina particles, and exhibits extremely excellent orientation in the solid drawing material as compared with other extender materials, and the strength can be improved even with a small amount of use. Further, since extremely thin plate-like alumina particles are arranged in layers in the solid drawing material, each plate-like alumina can be uniformly and easily peeled off during writing, and high wear resistance can be obtained. By these, a solid drawing material excellent in strength and color development can be obtained.

[0017]

EXAMPLES The present invention will be described below based on examples.
The invention is not limited to the examples. <Example 1> Nitrocellulose (binder) 16 parts by weight Talc (exterior material) 25 parts by weight Plate-like alumina (average particle diameter: 2 μm, aspect ratio: 50) 10 parts by weight Stearic acid (sliding material) 19 parts by weight Propylene Carbonate (plastic material) 5 parts by weight Phthalocyanine bleu- (coloring material) 25 parts by weight MEK (solvent) 100 parts by weight The above materials are blended, dispersed with a Hensil mixer, and then kneaded and further dispersed with a three-roll mill. After molding with a vertical extruder while adjusting the solvent content, it was dried at 80 ° C. for 8 hours in order to completely remove the residual solvent content, and a blue pencil lead having a nominal diameter of 2 was obtained.

<Example 2> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 0.6 μm, aspect ratio: 1).
The same operation as in Example 1 was carried out except that 0) was replaced,
A blue colored pencil lead having a nominal diameter of 2 was obtained.

Example 3 In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 5 μm, aspect ratio: 70).
The same operation as in Example 1 was carried out except that the above procedure was repeated to obtain a blue colored pencil lead having a nominal diameter of 2.

<Example 4> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 10 μm, aspect ratio: 3).
The same operation as in Example 1 was carried out except that 0) was replaced,
A blue colored pencil lead having a nominal diameter of 2 was obtained.

<Example 5> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 18 μm, aspect ratio: 7).
The same operation as in Example 1 was carried out except that 0) was replaced,
A blue colored pencil lead having a nominal diameter of 2 was obtained.

<Example 6> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 2 μm, aspect ratio: 25).
The same operation as in Example 1 was carried out except that the above procedure was repeated to obtain a blue colored pencil lead having a nominal diameter of 2.

<Examples 7 to 9> All except that the amount of plate-like alumina (average particle diameter: 2 μm, aspect ratio: 50) used in Example 1 was changed to 3 parts by weight, 20 parts by weight, and 35 parts by weight, respectively. Perform the same operation as in Example 1 to obtain a nominal diameter of 2
To obtain a blue pencil lead.

<Comparative Example 1> The same procedure as in Example 1 was carried out for the composition of Example 1 except for the plate-like alumina (average particle diameter: 2 μm, aspect ratio: 50), and a blue colored pencil having a nominal diameter of 2 was used. I got a core.

<Comparative Example 2> In Example 1, the plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with the plate-like alumina (average particle size: 0.4 μm, aspect ratio:
The same operation as in Example 1 was performed except that 8) was replaced.
A blue colored pencil lead having a nominal diameter of 2 was obtained.

<Comparative Example 3> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 1 μm, aspect ratio: 8).
The same operation as in Example 1 was carried out except that the above procedure was repeated to obtain a blue colored pencil lead having a nominal diameter of 2.

Comparative Example 4 In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 22 μm, aspect ratio: 7).
The same operation as in Example 1 was carried out except that 0) was replaced,
A blue colored pencil lead having a nominal diameter of 2 was obtained.

<Comparative Example 5> In Example 1, plate-like alumina (average particle size: 2 μm, aspect ratio: 50) was replaced with plate-like alumina (average particle size: 25 μm, aspect ratio: 8).
The same operation as in Example 1 was performed except that the procedure 5) was replaced.
A blue colored pencil lead having a nominal diameter of 2 was obtained.

<Comparative Examples 6 to 8> In Example 1, plate-like alumina (average particle diameter: 2 μm, aspect ratio: 50)
The same procedure as in Example 1 was carried out except that the amounts used in Example 1 were 1.5 parts by weight, 45 parts by weight, and 70 parts by weight, respectively, to obtain a blue pencil lead having a nominal diameter of 2.

As described above, the bending strength (unit: MPa) of the colored pencil lead obtained in each of the above-mentioned Examples and Comparative Examples and the density (unit: D) as a substitute characteristic of color developability are defined in JIS S 6005.
It was measured based on. The results are shown in Table 1.

[0031]

[Table 1]

[0032]

As described above, the average particle size is 0.5 to 2
By using the plate-like alumina having a thickness of 0 μm and an aspect ratio of 10 to 80, it is possible to obtain a solid drawing material excellent in strength and color developability.

Claims (2)

[Claims] 1. A solid drawing material using at least a binder, an extender and a coloring material, wherein the extender has an average particle size of at least 0.5 to 20 μm and an aspect ratio of 10 to 8.
A solid drawing material comprising a plate-shaped alumina of 0. 2. The solid drawing material according to claim 1, wherein the amount of the plate-like alumina used is 2 to 30% by weight based on the total amount of the solid drawing material.