JP2001200189A - Unbaked lead for colored pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lead for colored mechanical pencil suitable for writing on a hard and a not flat surface. SOLUTION: This lead for colored mechanical pencil has a bulk density of 1.70-2.00 g/cm3 and a diameter of 1.2-1.6 mm.

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, a body material and a coloring material, kneading and molding, and without firing.

[0002]

2. Description of the Related Art Conventionally, non-baked colored pencil leads are generally made of coloring materials such as organic binders, builders such as talc and calcium carbonate, waxes such as carnauba and paraffin, metal salts such as calcium stearate, and various inorganic and organic pigments. It is obtained by kneading a material, a plasticizer, an organic solvent, and the like with a three-roll mill or the like, forming a core by an extruder or the like, and performing a drying treatment as necessary.

[0003]

Heretofore, in a color pencil lead having a small diameter which can be used particularly for a mechanical pencil having a diameter of 1.2 to 1.6 mm, for example, wood or gypsum board such as a building material is used. When considering the use of writing on such a hard, uneven surface, a colored pencil lead for a mechanical pencil having sufficient strength to withstand practical use has not been obtained. Therefore, as a color pencil lead conventionally used for writing on such a hard surface, a color pencil lead obtained by winding a large-diameter lead having a diameter of 1.8 mm or more around a wooden shaft was mainly used.

[0004] A thick colored pencil lead having a diameter of 1.8 mm or more becomes rounded at the end of use, the width of the writing line gradually increases, and the writing quality becomes extremely poor. I will. For this reason, it is necessary to carry a pencil sharpener, but especially when writing on hard and uneven surfaces such as wood and plasterboard, frequent wear is required to maintain a constant line width and writing taste quickly. The core had to be sharpened, which was very complicated. In that respect, a knock mechanical pencil is very useful, but the conventional core with a diameter of 0.5 mm or 0.9 mm has a low strength and cannot withstand writing on a hard surface. Not suitable for use.

[0005]

According to the present invention, there is provided a non-fired colored pencil lead formed by mixing at least a binder, a body material and a coloring material, and having a bulk density of 1.70 to 2.00 g / c.
The gist of the present invention is a non-fired colored pencil lead for a mechanical pencil, characterized by having a m ³ of 1.2 to 1.6 mm in diameter.

The details will be described below. As the binder used in the present invention, nitrocellulose is most preferred, but carboxymethylcellulose, cellulose acetate, cellulose derivatives such as cellulose nitrate, polymethyl methacrylate, polyvinyl alcohol, polyvinyl butyral, polyethylene, epoxy resin, polyvinyl chloride, chloride Vinyl-vinyl acetate copolymer, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, tragacanth rubber, gum arabic, synthetic resins such as guar gum, natural resins and the like can also be used.
These may be used alone or in combination of two or more.

[0007] As a body material, mica-containing calcium carbonate, talc, boron nitride, Nε-lauroyl lysine, graphite fluoride, natural graphite, calcium carbonate, magnesium phosphate, barium sulfate and the like can be used. You may use it in combination of types or two or more types. The amount of extender used is 2 to the total amount excluding the volatile solvent.
The amount is preferably 0 to 60% by weight, more preferably 30 to 50% by weight. Depending on the other composition, 2
If the amount is less than 0% by weight, the bulk density is low and the strength is low. If the amount is more than 60% by weight, the bulk density is high and the strength is high, but the coloring and writing quality are poor. .

As the coloring material, known dyes and pigments can be used alone or in combination, regardless of various inorganic or organic materials. Specific examples thereof include rhodamine B base (CI. 45170B), Sordan Red 3R (CI. 21260), and methyl violet 2
B base (CI. 42535B), Victoria Blue F4R (CI. 42563B), Nigrosine base L
K (CI. 50415), Bali First Yellow #
3104 (CI. 13900A), Balifast Yellow # 3105 (CI. 18690), Orient Spirit Black AB (CI. 50415), Balifast Black # 3804 (CI. 1219)
5), Balifast Yellow # 1109, Balifast Orange # 2210, Balifast Red # 13
20, Balifast Blue # 1605, Balifast Violet # 1701, Spiron Black GMH
Special, Spiron Yellow C-2GH, Spiron Red C-GH, Spiron Red C-BH, Spiron Blue BPNH, Spiron Blue C-RH, Spiron Violet C-RH, S.P. P. T. Orange 6, S.I. P.
T. Oil-based dyes such as Blue-111, Japananol Fast Black D Conc (CI Direct Black 1
7), Water Black 100L (19), Water Black L-200 (19), Water Black # 7 (19), Kayaset Black W9 (1)
9), Direct Fast Black B (22), Direct Fast Black AB (32), Direct Deep Black EX (38), Direct Deep Black (38 similar products), Direct Fast Black Conch (51), Kaya Rath Sprague VGN (7
1), Kayak Direct Brilliant Yellow G (C.I.
I. Direct Yellow 4) Direct Fast Yellow 5
GL (26), Aizen Brimura Yellow GCLH (44), Direct Fast Yellow R (50), Aizen 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 (39), Aizen Murabin Conch 2BLH (75), Sumilight Red F3B
(80), Eisen Burimura Red 4BH (81)
Kayalas Sprarubin BL (83), Kayalas Light Red F5G (225), Kayalas Light Red F5
B (226), Kayasu Light Rose FR (22)
7) Direct Sky Blue 6B (CI Direct Blue 1), Direct Sky Blue 5B (15),
Benzo Brilliant Sky Blue 8GS (41), Sumilite Supra Blue BRR Conc (71), Diebogen Turquoise Blue S (86), Water Blue # 3 (86), Kayara Star Coy Blue GL (86), Direct dyes such as Daiwa Blue 215H (87), Kayalas Supra Blue FF2GL (106), Kayaras Supra Blue FFRL (108), Kayaras Splatter Turquoise Blue FBL (199) and Acid Blue Black 10B (C.I. I. Acid Black 1),
Nigrosine (2), Water Black R455 (2), Water Black R510 (2), Suminol Milling Black 8BX (24), Kayanol Milling Black VLG (26), Kayanol Milling Black BR Conc (2) 31), Mitsui Nylon Black GL (52), Eisen Opal Black WH Extra Conc (52), Sumilan Black WA (5)
2), Ranyl Black BG Extra Conc (10
7), Kayanol Milling Black TLB (10
9), Suminol Milling Black B (109), Kayanol Milling Black TLR (110), Eisen Opal Black New Conc (119), Water Black 187-L (154) Acid Yellow # 10 (CI) Acid Yellow 1), Kayak Acid Brilliant Flavin FF (7: 1), Kayasil Yellow GG (17), Xylene Light Yellow 2G 140%
(17), Suminol Leveling Yellow NR (1)
9), Water Yellow # 1 (23), Daiwa Torazine (25), Kayaktor Trazine (23),
Suminol Fast Yellow R (25) Diacid Light Yellow 2GP (29), Suminol Milling Yellow O (38), Suminol Milling Yellow MR (4)
2), Water Yellow # 6 (42), Kayanol Yellow NFG (49), Suminol Milling Yellow 3
G (72), Suminol Fast Yellow G (6)
1), Suminol Milling Yellow G (78), Kayanol Yellow N5G (110), Suminol Milling Yellow 4G 200% (141), Kayanol Yellow NG
(135), Kayanol Milling Yellow 5GW (1
27), Kayano Lumiling Yellow 6GW (14
2), Sumitomo Fast Scarlet A (CI Acid Red 8), Kayak Silk Scarlet (9),
Solar Rubin Extra (14), Daiwa New Koksin (18), Water Scarlet (1)
8), Daiwa Red No. 102 (18), Eisenbon Saw RH (26), Daiwa Red 2 (27), Suminol Leveling Brilliant Red S3B (35),
Kayasil rubinol 3GS (37), Aizen erythrosine (51), kayak acid rhodamine FB (52), Daiwa red No. 106 (52), Suminol leveling rubinol 3GP (57), Diacid alizarin rubi Nord F3G 200% (82), Alizarin Rubinol 5G (83), Eizen Eosin GH
(87), Water Red # 2 (87), Daiwa Red 103WB (87), Water Pink # 2 (92), Eisen Acid Phloxine PB (92),
Daiwa Red No. 104 (92), Rose Bengal (9)
4), Kayanol milling scarlet FGW (11
1), Kayanol Milling Rubin 3BW (129)
Suminol Milling Brilliant Red 3BN Conc (131), Suminol Milling Brilliant Red BS (138), Aizen Opal Pink BH (1)
86), Suminol Brilliant Red B Conch (2
49), Kayak Acid Brilliant Red 3BL (254), Kayak Acid Brilliant Red BL (265), Kayanol Milling Red GW (27)
6), Mitsui Acid Violet 6BN (CI Acid Violet 15), Mitsui Acid Violet BN (17), Water Violet # 1 (4)
9), Water Violet # 5 (49), Daiwa Purple No. 1 (49), Ink Violet L10 (4)
9), Sumitomo Patent Pure Blue VX (CI Acid Blue 1), Water Blue # 106 (1), Patent Blue AF (7), Water Blue # 9 (9), Daiwa Blue 1 ( 9), Ink Blue L20 (9), Spranol Blue B (15), Water Blue # 116 (15), Orient Soluble Blue OBC (22), Orient Soluble-
OBX (22), Sumino-le leveling blue 4GL
(23), Mitsui Nylon Fast Blue G (2)
5), Kayasil Blue AGG (40), Kayasil Blue BR (41), Mitsui Alizarin Safirol SE
(43), Suminol Leveling Sky Blue R Extra Conc (62), Mitsui Nylon Fast Sky Blue R (78), Sumitomobrilliant Indocyanine 6Bh / e (83), Sandrancyanin N-
6B350% (90), Water Blue # 115
(90), Water Blue # 105 (90), Orient Soluble Blue OBB (93), Spranol Cyanine 7BF (100), Sumitomobrilliant Blue 5G (103), Acid Blue (10)
3), Asilane brilliant blue FFR (10
4), Kayanol Milling Ultra Sky SE (11
2), Kayanol milling cyanine 5R (113);
Aizen Opal Cyanine 2GLH (158), Daiwa Guinea Green B (CI Acid Green 3) Acid Brilliant Milling Green (9), Daiwa Green # 70 (16), Kayanol Cyanine Green G (25) ), Suminol Milling Green G (2
7), acid dyes such as water orange # 17 (CI acid orange 56), water yellow # 2
(CI Food Ero-3), Food Yellow No. 5 (C.I.
I. Food Yellow 3) Food Red No. 3 (CI Food Red 14), Food Blue 2 (CI Acid Blue 74), Food Green 2 (CI Acid Green 5), etc. Food dye, malachite green (CI.4
2000), Victoria Blue FB (CI. 4404)
5), methyl violet FN (C.I.
5), basic dyes such as rhodamine F4G (CI. 45160) and rhodamine 6GCP (CI. 45160).

Conventionally known pigments can be used as the pigment.
As specific examples, SpecialBlack 6 and S
170, S610, 5, 5, 4, 4A, 550,
35, 250, 100, Printex 150
T, U, V, 140U, 140V, 95, 90, 85, 80, 75, 55, 45, 45, P, XE2, L6, L, 300 30, 30, 35, 25, 200, A, G (all manufactured by Degussa Japan KK), # 2400B, # 235
0, # 2300, # 2200B, # 1000, # 95
0, # 900, # 850, # MCF88, MA600,
MA100, MA7, MA11, # 50, # 52, # 4
5, # 44, # 40, # 33, # 32, # 30, CF
9, # 20B, # 4000B (Mitsubishi Chemical Industries, Ltd.), MONARCH 1300, 1100,
1000, 900, 880, 800, 70
0, MOGULL, REGAL 400R, 660
R, 500R, 330R, 300R, 99R,
ELFTEX 8, 12 and BLACK PEARLS
2000 (above, USA, Cabot Co. Ltd.
Manufactured), Raven7000, 5750, 5250,
5000, 3500, 2000, 1500, 1255, 1250, 1200, 1170, 1
060, 1040, 1035, 1020, 10
00, 890H, 890, 850, 790, 780, 760, 500, 450, 430, 420, 410, 22, 22, 16, 14, and 825
Oil Beads, H20, C, Conduc
carbon blacks such as tex 975, 900, and SC (all manufactured by Colombian Carbon Japan Co., Ltd.);
KA-10, 10P, 15, 15, 20, 30, 3
5, 60, 80, 90, KR-310, 38
0, 460, 480 (Titanium Industry Co., Ltd.
Titanium oxide such as P25 (produced by Nippon Aerosil Co., Ltd.), inorganic pigments such as black iron oxide, yellow iron oxide, red iron oxide, ultramarine, navy blue, cobalt blue, chrome green, and chromium oxide; 10G, 5G, 3G, 4, GR, A, Benzidine Yellow, Permanent Yellow NCG, Tartrazine Lake, Quinoline Yellow, Sudanese 1, Permanent Orange, Indus Ren Brilliant Orange GN, Permanent Brown F
G, para brown, permanent red 4R, fire red, brilliant carmine BS, pyrazolone red, lake red C, quinacridone red, brilliant carmine 6B, bordeaux 5B, thioindigo red,
Organic pigments such as Fast Violet B, Dioxane Violet, Alkaline Blue Lake, Phthalocyanine Blue, Indigo, Acid Green Lake, and Phthalocyanine Green. In addition, inorganic fluorescent pigments such as zinc sulfide, zinc silicate, zinc cadmium sulfate, calcium sulfide, strontium sulfide, calcium tungstate, and other known organic fluorescent pigments can be used. These colorants can be used alone or in combination with others. Further, a processed pigment in which a resin is attached around the pigment can also be used. Examples of the processed pigment include MICROLITHA, MICROLITH K,
MICROLITH T, MICROLITHWA, M
ICROLITH AB (CIBA-GEIGY
(Switzerland).

As other materials, those conventionally added to a colored pencil lead can be used without any particular limitation.
To give an example, as the amount of wear material, paraffin wax, vaseline, microcrystalline wax, cadilla wax, carnauba wax, caster wax,
Waxes such as montan wax, polyethylene wax, distearyl ketone, ketone wax, beeswax, and wax, lard, hardened tallow oil, oils and fats such as hardened fish oil,
Examples thereof include higher fatty acids such as stearic acid and metal stearic acid and salts thereof, and examples of the plasticizer include tricresyl phosphate, dimethyl phthalate, diallyl phthalate, dibutyl phthalate, dioctyl phthalate, and propylene carbonate. Further, as other compounding agents, liquid paraffin, spindle oil, liquid oil such as machine oil, methyl ethyl ketone, acetone, methyl isobutyl ketone,
There are solvents such as water.

[0011]

When a mechanical pencil is used for writing on a hard and uneven surface such as wood or gypsum board, the core must have a diameter of 1.2 to 1.6 mm. 1.
If it is less than 2 mm, the strength is low, and if it exceeds 1.6 mm, if the core is worn, a constant line width and writing quality cannot be maintained, and it becomes necessary to sharpen the tip with a pencil sharpener. At this time, the bulk density of the colored pencil core is 1.70 to 2.00 g / c.
m ³ . The bulk density is 1.70 g /
If it is less than cm ³ , the coloring is good, but the strength is extremely low, and the core breaks many times during writing. When the bulk density exceeds 2.00 g / cm ³ , although the strength is increased, the coloring condition and writing taste are extremely poor. Also,
As a use for writing on a hard and uneven surface, for example, a use for blackening a building material can be considered. In such a case, there are many cases of being particularly treated roughly or being left outdoors for a long time. Therefore, it is needless to say that the strength of the core is required. However, there is also a need for a problem with time, for example, water resistance such that the core does not expand or its strength does not decrease even when wet. Therefore, it is preferable to use nitrocellulose as the binder. By using nitrocellulose as a binder, it is possible to obtain a non-fired color pencil lead having extremely high strength, excellent water resistance, and no change over time as compared with the case where another binder is used.

[0012]

EXAMPLES <Example 1> Nitrocellulose resin (binder) 20 parts by weight Talc (building material) 40 parts by weight Polyethylene wax (wax) 5 parts by weight Phthalocyanine blue (coloring material) 35 parts by weight Methyl ethyl ketone (solvent) 100 parts by weight Part After kneading the above materials while adjusting the solvent amount with three rolls,
It was extruded into a thin wire and dried at 80 ° C. for about 8 hours in a drier to remove the solvent to obtain a blue lead for a mechanical pencil having a diameter of 1.3 mm.

<Examples 2 to 3> All of Example 1 was the same as Example 1 except that the amounts of talc and phthalocyanine blue were changed to 30 parts by weight: 45 parts by weight and 50 parts by weight: 25 parts by weight, respectively. As a result, a blue lead for a mechanical pencil having a diameter of 1.3 mm was obtained.

Example 4 Nitrocellulose resin (binder) 20 parts by weight Talc (body extender) 30 parts by weight Nε lauroyl lysine (body extender) 10 parts by weight Polyethylene wax (wax) 5 parts by weight Phthalocyanine blue (colorant) 35 parts by weight Methyl ethyl ketone (solvent) 100 parts by weight The above-mentioned material was treated in the same manner as in Example 1, and the diameter was 1.3 m.
m of a blue lead for a mechanical pencil was obtained.

<Examples 5 and 6> Each of the diameters was 1.2 m.
m and 1.6 mm, except that a blue lead for a mechanical pencil was obtained in the same manner as in Example 1.

<Comparative Examples 1 and 2> All of Example 1 was conducted except that the amount of talc: colorant used was 20 parts by weight: 55 parts by weight and 60 parts by weight: 15 parts by weight.
As a result, a blue lead for a mechanical pencil having a diameter of 1.3 mm was obtained.

Comparative Example 3 In Example 4, talc:
A blue core for a mechanical pencil having a diameter of 1.3 mm was obtained in the same manner as in Example 4 except that the amount of Nε lauroyl lysine used was changed to 10 parts by weight and 30 parts by weight, respectively.

Comparative Example 4 Polyester polyol resin (water-soluble resin binder) 20 parts by weight Talc (building material) 40 parts by weight Polyethylene wax (wax) 5 parts by weight Phthalocyanine blue (coloring material) 35 parts by weight Methyl ethyl ketone (solvent) 100 parts by weight The above material was treated in the same manner as in Example 1, and the diameter was 1.3 m.
m of a blue lead for a mechanical pencil was obtained.

<Comparative Examples 5 to 6> Each of the diameters was 1.1 m.
m and 1.8 mm, except that a blue lead for a mechanical pencil was obtained.

Comparative Examples 5 to 6 A blue lead for a mechanical pencil was obtained in the same manner as in Comparative Example 1 except that the diameter was 1.1 mm.

Table 1 shows the properties of the non-fired colored pencil leads obtained in the above examples. For the strength, the bending strength was measured in accordance with the measuring method of JIS S6005, and for the number of breaks, the obtained colored pencil lead was placed in a mechanical pencil, and the lead was placed in a pencil.
A line of 1 m was drawn on the wood in a state where the core was protruded, and the number of times the core was broken during that time (when the core was broken, the core was protruded again by 2 mm) was measured. At this time, we used cedar planks as wood,
The surface roughness in the direction perpendicular to the nodes is determined according to JIS B 0601.
The average roughness Ra of the center line was about 2.0 μm. The writing method was such that a ruler was applied to the node in the vertical direction, and writing was performed by hand so that the writing load was constant at 500 g as much as possible, and the writing angle was perpendicular to the wood. In addition, about coloring condition,
The line written as described above is connected to a spectrophotometer (Minolta
CM-3700d), and evaluated by calculating a color difference ΔE when the surface of the underlying wood is used as a reference color. The color difference at the three points at the beginning, middle, and end of the writing was measured, and the average value was defined as the color difference ΔE. At this time, the larger the value of ΔE, the more the wood is colored, indicating that the coloring condition is good.

[0022]

[Table 1]

[0023]

As described above, the present invention can provide a high-strength colored pencil lead for a mechanical pencil suitable for writing on a hard and uneven surface.

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Claims (2)

[Claims] 1. A non-fired colored pencil lead formed by blending at least a binder, an extender and a coloring material, has a bulk density of 1.70 to 2.00 g / cm ³ and a diameter of 1.2 to 1.
A non-fired colored pencil lead for a mechanical pencil characterized by being 6 mm. 2. The non-fired colored pencil lead according to claim 1, wherein nitrocellulose is used as the binder.