Pencil or cosmetic barrel

Abstract

To provide a shaft of a pencil core (including colored pencil core) that has the same ease of sharpening as a conventional wooden shaft and has less impact on an environment, or a shaft of cosmetics such as eyeliners, eyebrows, eye shadows and other rod-shaped cosmetic.SOLUTION: A pencil or cosmetic shaft of the present invention is a pencil or cosmetic shaft obtained by coating a pencil core or a rod-shaped cosmetic with a shaft material composition, and the shaft material composition contains at least a naturally-occurring filler material and a naturally-occurring binding material.SELECTED DRAWING: None

Description

【Technical Field】 , , 【0004】 【0001】 The present invention relates to a shaft body for a pencil lead or a cosmetic, which has the same easy-to-cut property, drop resistance, and water resistance as a conventional wooden shaft, has a low environmental load, and can be easily manufactured. 【Background Art】 【0002】 Conventionally, as a shaft body for pencils, stick-shaped cosmetics, etc., natural wood that gives users a good feel, particularly natural wood such as American red cedar, is used because it is soft and easy to cut with a knife or a pencil sharpener. By the way, in recent years, it has been decreasing due to deforestation such as illegal logging. From such a situation, the problem of environmental destruction has attracted attention. It has become difficult to obtain red cedar, etc., and the development of alternative materials has been carried out. 【0003】 Conventionally, as a technology for alternative materials for shaft bodies of pencils, stick-shaped cosmetics, etc., for example, 1) On the rod-shaped outer peripheral surface of a core material containing a thermoplastic resin, a lubricant, and graphite or a pigment, convex stripes and concave stripes are alternately and continuously integrally formed along the axial direction. Outside the core material, a shaft material containing the thermoplastic resin, cellulose fiber, and a foaming agent is formed so as to adhere to the uneven surface of the stone material, and a part of the cellulose fiber in the shaft material is mixed into the uneven portions of the rod-shaped outer peripheral surface of the core material in an embedding manner. A pencil characterized by this (for example, see Patent Document 1), 2) In order to provide a pencil that can be削 with a pencil sharpener without any problem and can be manufactured at a low cost because this shaft is excellent in processability, cellulose-based fine particles subjected to a grinding treatment are mixed into a resin, the mixture is molded by extrusion or injection molding, and further, a core is inserted into a shaft obtained by forming this molded body into a pencil shaft shape. A pencil (for example, see Patent Document 2), 【0004】 3) To provide a biodegradable synthetic pencil-type cosmetic shaft and a method for producing the same, which has excellent physical properties such as rigidity, machinability, and oil and grease penetration resistance as a synthetic shaft to replace a wooden shaft, as well as a good feel to use, and which is easily decomposed after disposal, can be burned with low heat, and does not generate harmful substances when incinerated, a hollow cylindrical biodegradable synthetic pencil-type cosmetic shaft is formed using a biodegradable thermoplastic material as a base material, which consists of a starch ester in which the hydrogen of the reactive hydroxyl group of the same starch molecule is substituted with short-chain acyl groups and long-chain acyl groups, and a reinforcing filler (see, for example, Patent Document 3), 4) A pencil characterized in that the surface of the wooden shaft is covered with a foamed resin coating layer formed of a heat-expandable resin (see, for example, Patent Document 4), These are some of the known facts. 【0005】 However, the aforementioned Patent Documents 1 to 4 still have a significant environmental impact, and when attempting to manufacture products with a lower environmental impact, there are challenges such as reduced ease of machining, drop resistance, and water resistance. [Prior art documents] [Patent Documents] 【0006】 [Patent Document 1] Japanese Patent Publication No. 60-204399 (Claims, Examples, etc.) [Patent Document 2] Japanese Patent Publication No. 6-255296 (Claims, Examples, etc.) [Patent Document 3] Japanese Patent Publication No. 2001-192502 (Claims, Examples, etc.) [Patent Document 4] Japanese Patent Publication No. 2014-19042 (Claims, Examples, etc.) [Overview of the project] [Problems that the invention aims to solve] 【0007】 The present invention aims to solve the above-mentioned problems of the conventional invention and to provide a pencil lead or a barrel for a stick-shaped cosmetic that has the same ease of sharpening, drop resistance, and water resistance as conventional wooden barrels, has less environmental impact, and can be easily manufactured. [Means for solving the problem] 【0008】 As a result of diligent research into the above-mentioned conventional problems, the present inventors have found that a pencil or cosmetic shaft, comprising a pencil lead or rod-shaped cosmetic coated with a shaft material composition, can be obtained by the shaft material composition containing at least a specific binder and a binder, thereby achieving the above-mentioned objective, and have completed the present invention. 【0009】 In other words, the pencil or cosmetic shaft of the present invention is a pencil or cosmetic shaft formed by coating a pencil lead or a rod-shaped cosmetic with a shaft material composition, characterized in that the shaft material composition contains at least a naturally derived binder and a naturally derived binder. It is preferable that the shaft material composition has a naturally derived index (excluding water) of 75% or more. The shaft material composition preferably further contains a naturally derived binder which is carboxymethylcellulose or a salt thereof, or a crosslinking agent having a carboxylic acid group that ester-crosslinks the binder. The present invention relates to a pencil comprising at least a pencil lead and a shaft formed by covering and molding the pencil lead, characterized in that the shaft is a shaft having the above configuration. Furthermore, the present invention relates to a stick-shaped cosmetic comprising at least a stick-shaped cosmetic and a shaft formed by covering and molding the stick-shaped cosmetic, characterized in that the shaft is a shaft having the above configuration. [Effects of the Invention] 【0010】 According to the present invention, it is possible to provide a pencil lead or cosmetic shaft that has the same ease of sharpening and drop resistance as conventional wooden shafts, has less environmental impact, and can be easily manufactured, as well as a pencil, stick-shaped cosmetic, etc. equipped with this shaft. The object and effect of the present invention are recognized and obtained, in particular, by using the components and combinations indicated in the claims. Both the general description above and the detailed description below are illustrative and descriptive, and do not limit the present invention as described in the claims. [Modes for carrying out the invention] 【0011】 Embodiments of the present invention will be described in detail below. However, it should be noted that the technical scope of the present invention is not limited to the embodiments detailed below, but extends to the invention described in the claims and its equivalents. Furthermore, the present invention can be implemented based on the contents disclosed herein and common technical knowledge in the art (including design matters and obvious matters). 【0012】 The present invention relates to a pencil or cosmetic shaft, which is a pencil or cosmetic shaft formed by coating a pencil lead or a rod-shaped cosmetic with a shaft material composition, characterized in that the shaft material composition contains at least a naturally derived binder and a naturally derived binder. 【0013】 Examples of naturally derived binders used in this invention include sawdust, wood powder, powdered cellulose, or naturally derived inorganic powders obtained from naturally derived wood. The sawdust that can be used can be derived from hardwoods or softwoods, and is not particularly limited. Specific tree species of sawdust used in this invention include Japanese cedar, pine, larch, Japanese red pine, Sakhalin fir, cypress, beech, horse chestnut, sawtooth oak, Mongolian oak, oak, linden, birch, Japanese elm, lauan, and Western hemlock. In particular, cedar, cypress sapwood, beech, horse chestnut, and Mongolian oak are preferably used. Furthermore, waste generated during the production of these woods may also be effectively utilized. Moreover, at least one type of sawdust (or a combination of two or more types, and so on) can be used. From the standpoint of dispersibility and moldability, the sawdust should preferably have an average particle size of 10 mesh or more, and furthermore, from the standpoint of energy costs for grinding, it is desirable to use sawdust with a particle size of 200 mesh or less. 【0014】 As for the wood powder that can be used, for example, at least one of the following can be used: wood powder obtained from each of the tree species exemplified above in the sawdust, wood powder obtained from the above sawdust or waste wood, or sander powder. Furthermore, in order to further improve dispersibility and moldability, the upper limit of the average particle size of the wood powder is preferably 2000 μm or less, and the lower limit is preferably 100 μm or more, but it may also be in the form of microfibrillated fibers. The average particle size in this invention can be the value measured according to the laser diffraction and scattering method. 【0015】 The powdered cellulose that can be used is preferably cellulose powder obtained by finely grinding cellulose fibers from naturally derived plants, with an average particle size of 100 μm or less, preferably in the range of 10 to 50 μm. As the powdered cellulose, for example, crystalline cellulose powder having a certain particle size distribution may be used, produced by methods such as purifying and drying the undecomposed residue obtained after acid hydrolysis of selected pulp, and then grinding and sieving it. Alternatively, commercially available products such as "KC Floc" (manufactured by Nippon Paper Chemicals Co., Ltd.), "Ceolus" (manufactured by Asahi Kasei Chemicals Corporation), and "Avicel" (manufactured by FMC Corporation) may be used. 【0016】 At least one of the following naturally derived inorganic powders can be used: talc, calcium carbonate, huntite, kaolin, sericite, bentonite, titanium dioxide, etc. The upper limit of the average particle size of these inorganic powders is preferably 50 μm or less, and the lower limit is preferably 1 μm. 【0017】 The content of these natural-derived extender materials is preferably 60 to 90% by mass, more preferably 70 to 80% by mass, based on the total amount of the shaft body material composition. By setting the content of this natural-derived extender material to 60% by mass or more, workable cutting performance can be achieved, and by setting it to 90% by mass or less, workable strength can be obtained. In addition, among these natural-derived extender materials, when the proportion of inorganic powder is 60% by mass or less, the impact resistance of the shaft body is improved, and when used as a pencil or cosmetic, breakage inside the pencil lead or stick-shaped cosmetic can be prevented. 【0018】 As the natural-derived binder used in the present invention, at least one of cellulose fibers (including nanofibers), methyl cellulose or its salts, carboxymethyl cellulose or its salts, hydroxymethylpropyl cellulose or its salts, cellulose acetate or its salts, sodium alginate, etc. can be used. As the salts of each of the above celluloses, sodium Salt (Na salt) , ammonium Salt (NH 4 salt) , calcium Salt (Ca salt) etc. can be mentioned. These binders are preferably water-soluble, and more preferably ammonium carboxymethyl cellulose from the viewpoint of imparting water resistance. 【0019】 The content of these natural-derived binders is preferably 10 to 40% by mass, more preferably 20 to 30% by mass, based on the total amount of the shaft body material composition. By setting the content of this natural-derived binder to 10% by mass or more, workable strength can be achieved, and by setting it to 40% by mass or less, workable cutting performance can be obtained. 【0020】 In addition to the above natural-derived extender materials and natural-derived binders, the shaft body material composition in the present invention can further contain a cross-linking agent for cross-linking the binder, etc. from the viewpoint of further exerting the effects of the present invention and imparting water resistance. The crosslinking agent used to crosslink the aforementioned binder is preferably one that has a carboxylic acid group that crosslinks the binder with ester, and specifically, examples include succinic acid, malic acid, maleic acid, tartaric acid, citric acid, and polyacrylic acid. The content of these crosslinking agents is preferably 0.1 to 5% by mass, and more preferably 0.5 to 2% by mass, relative to the total amount of the shaft material composition, from the standpoint of developing water resistance, suppressing strength reduction due to moisture absorption, and suppressing discoloration of the material. 【0021】 Furthermore, in addition to the above-mentioned naturally derived binder, naturally derived binder, and crosslinking agent, the shaft material composition of the present invention may optionally contain, as needed, colorants for coloring the shaft (dyes, inorganic pigments, organic pigments), iron oxide, zinc oxide, carbon black, natural pigments, etc. 【0022】 These shaft material compositions are preferably composed of 75% or more of naturally derived materials (excluding water) in order to further enhance the effects of the present invention and to minimize environmental impact. This "natural origin index (excluding water)" refers to the index representation according to ISO 16128. By making this natural origin index (excluding water) 75% or higher, and more preferably 85% or higher, it becomes possible to obtain a pencil lead or cosmetic barrel that has an extremely low environmental impact. Achieving a naturally derived index (excluding water) of 75% or more in this shaft material composition can be accomplished by appropriately selecting the naturally derived binders and natural derived conjugates mentioned above. 【0023】 The pencil or cosmetic shaft of the present invention is obtained by dry-mixing a compound composition consisting of the above-mentioned naturally derived filler material, naturally derived binder, etc., using a kneader such as a Henschel mixer, planetary mixer, or kneader, then adding water (purified water, distilled water, etc.) to a moisture content of 40-80% and kneading to obtain a slurry. This slurry is then further kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 30-60%. This mixture is then applied to the outer surface of the pencil lead or cosmetic using an extrusion molding machine with a die of a predetermined diameter, and dried to obtain the pencil or cosmetic. Alternatively, the kneaded material can be formed into a round bar or plate using an extrusion molding machine with a die of a predetermined diameter or a T-die, and a molded body can be produced by drying. These can then be processed to insert the pencil lead or cosmetic, thereby obtaining the pencil or cosmetic. Furthermore, by controlling the press pressure during extrusion molding, the moisture content, and the combination of naturally derived binders and other materials, the physical properties of the shaft can be broadly controlled. This allows for the creation of a pencil or cosmetic shaft that satisfies the desired texture, strength, and moldability. 【0024】 In the present invention, the composition and form of the pencil lead coated with the above-mentioned shaft material composition are not particularly limited, and examples include fired pencil leads (including fired colored pencil leads) and unfired pencil leads (including unfired colored pencil leads). Examples of fired pencil leads include those obtained by mixing, dispersing, and kneading materials such as coloring components such as graphite, vinyl chloride resin, vinylidene chloride resin, vinyl acetate resin, chlorinated polyethylene, polyvinyl alcohol, acrylamide resin, chlorinated paraffin resin, phenolic resin, furan resin, urea resin, and butyl rubber, as well as plasticizers such as phthalate esters, solvents such as methyl ethyl ketone and water, stabilizers such as stearate, lubricants such as stearic acid, and fillers such as carbon black, extruding the mixture into a fine wire shape, and then heat-treating the resulting core to a firing temperature, and then impregnating it with oily substances such as silicone oil, liquid paraffin, spindle oil, squalane, and α-olefin oligomers or waxes. 【0025】 Furthermore, the composition and form of the rod-shaped cosmetic coated with the above-mentioned shaft material composition are not particularly limited, and various formulations used for applications such as eyeliner, eyebrow pencil, lip liner, concealer pencil, and eyeshadow pencil are possible. For example, a cosmetic obtained by kneading oils, fats, waxes, fatty acids, hydrocarbons, waxes, clays, colorants, and extenders together and forming them into a rod shape is an example. These may be fired rod-shaped cosmetic products or non-fired rod-shaped cosmetic products. 【0026】 The pencil lead or cosmetic shaft of the present invention, configured in this way, has the same ease of sharpening, drop resistance, and water resistance as conventional wooden shafts, has a low environmental impact, and can be used without modifying the molding machines used in the molding of conventional pencils and cosmetic products, thus providing a pencil lead or cosmetic shaft that can be easily manufactured. 【0027】 The pencil of the present invention is characterized in that at least the shaft body formed by coating and molding the pencil lead described above is a shaft body having the above configuration, and the stick-shaped cosmetic of the present invention is characterized in that at least the shaft body formed by coating and molding the stick-shaped cosmetic described above is a shaft body having the above configuration. In this invention, pencil leads and stick-shaped cosmetics can be molded into any shape, such as a circular cross-section (including an ellipse), a polygonal cross-section (triangular or hexagonal), or a tubular shape. Therefore, pencils and stick-shaped cosmetics of various shapes can be produced by various processing methods such as coating and cutting. [Examples] 【0028】 The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The pencil leads used in Examples 1-8 and Comparative Example 1 were obtained by the following manufacturing method. 60% by mass of graphite and 40% by mass of clay were dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 40% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 30%. This mixture was molded using a hydraulic plunger extruder with a 2.5 mm diameter die, and the molded body was dried at 60°C, then fired at 800-1400°C for 12-24 hours to obtain a 2.0 mm diameter lead. The obtained lead was impregnated with α-olefin oligomer to obtain a 2.0 mm diameter pencil lead with a hardness of HB. 【0029】 (Example 1) Huntstone powder (average particle size 2 μm) 90% by mass Cellulose powder (average particle size 45 μm) 10% by mass The natural origin index (excluding water) of this shaft material composition was 100.0%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 40% and kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 30%. This mixture was then used in a hydraulic plunger extrusion machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. This molded body was dried in a 60°C environment to obtain a pencil. 【0030】 (Example 2) Cedar wood sawdust (16 mesh) 70% by mass Sodium carboxymethylcellulose 30% by mass The natural origin index (excluding water) of this shaft material composition was 92.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. The molded body was dried at 60°C to obtain a pencil. 【0031】 (Example 3) Talc (average particle size 8 μm) 40% by mass Cedar wood sawdust (16 mesh) 40% by mass Sodium carboxymethylcellulose 20% by mass The natural origin index (excluding water) of this shaft material composition was 95.0%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. The molded body was dried at 60°C to obtain a pencil. 【0032】 (Example 4) Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Carboxymethylcellulose sodium 10% by mass The natural origin index (excluding water) of this shaft material composition was 97.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. The molded body was dried at 60°C to obtain a pencil. 【0033】 (Example 5) Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Ammonium carboxymethylcellulose 10% by mass The natural origin index (excluding water) of this shaft material composition was 97.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion molding machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. The molded body was dried at 60°C and then heated at 180°C to make the binder insoluble, thereby obtaining a pencil. 【0034】 (Example 6) Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Carboxymethylcellulose sodium 10% by mass The natural origin index (excluding water) of this shaft material composition was 97.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then a 5% succinic acid aqueous solution was added to achieve a moisture content of 50% and kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion molding machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. After drying the molded body at 60°C, it was heated at 180°C to crosslink the binder and obtain a pencil. 【0035】 (Example 7) Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Methylcellulose 10% by mass The natural origin index (excluding water) of this shaft material composition was 97.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and the mixture was kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. The molded body was dried at 60°C to obtain a pencil. 【0036】 (Example 8) Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Methylcellulose 10% by mass The naturally derived index (excluding water) of this shaft material composition was 97.5%. The above-mentioned composition was dry-mixed in a Henschel mixer, and then a 5% succinic acid aqueous solution was added to achieve a moisture content of 50% and kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then used in a hydraulic plunger extrusion molding machine to coat the outer circumference of a 2.0 mm diameter, HB hardness pencil lead using a 9.0 mm diameter die. After drying the molded body at 60°C, it was heated at 180°C to crosslink the binder and obtain a pencil. 【0037】 (Example 9) <Preparation of solid cosmetic products> Beeswax 20 copies Ozokerite 10 copies Microcrystalline wax 10 pieces Carnabarow, Part 8 Vaseline 7 parts Lanolin Part 5 Liquid paraffin 7 parts Isopropyl myristate 4 parts The above-mentioned ingredients were dissolved, 10 parts of iron black and 19 parts of red iron oxide were added, the mixture was stirred and dispersed, then kneaded in a mixer, cooled to room temperature, and then extruded to obtain a 2.0 mm thick reddish-brown solid cosmetic. 【0038】 Talc (average particle size 8 μm) 30% by mass Cellulose powder (average particle size 45 μm) 60% by mass Methylcellulose 10% by mass The naturally derived index (excluding water) of the above shaft material composition was 97.5%. The above formulation was dry-mixed in a Henschel mixer, and then purified water was added to achieve a moisture content of 50% and kneaded. The resulting slurry was kneaded while being heated and degassed to obtain a clay-like mixture with a moisture content of approximately 40%. This mixture was then coated with the above 2.0 mm diameter solid cosmetic material using a hydraulic plunger extruder with a 9.0 mm diameter die. The molded body was dried at 60°C to obtain a bar-shaped cosmetic. 【0039】 (Comparative Example 1) Pencil (A pencil made by cutting an incense cedar board that has been impregnated with 2% paraffin wax by weight, and covering it with the above-mentioned pencil lead with a diameter of 2.0 mm and hardness of HB.) 【0040】 (Comparative Example 2) This pencil uses known recycled natural materials, and since a thermoplastic resin is used as a binder, it contains materials of non-natural origin. It consists of the following composition, with a natural origin index of 70.0%. Polypropylene (PP) 20% by weight Wood flour 70% by weight Polypropylene grafted with maleic anhydride, 1% by weight Amido wax 3% by weight Stearic acid 1% by weight Boron nitride 5% by weight 【0041】 The pencils obtained from Examples 1-9 and Comparative Examples 1-2 were evaluated for their ease of sharpening using the natural origin index and the evaluation method described below. These results are shown in Table 1 below. 【0042】 (natural origin index) The natural origin index (excluding water) of the shafts in Examples 1-9 and Comparative Examples 1-2 is determined by calculating the composition ratio as a percentage using the weight of natural raw materials and the naturally derived portion of naturally derived raw materials, excluding water, as defined in ISO 16128, based on the weight ratio of raw materials blended into the shaft material excluding the core. A higher value indicates a higher proportion of animal and plant-derived materials and a lower amount of petroleum-derived materials, thus indicating a lower environmental impact. 【0043】 (Method for evaluating ease of cutting) For the pencils of Examples 1-9 and Comparative Examples 1-2, the tip was sharpened to a diameter of 2 mm using a pencil sharpener. Then, using a pencil sharpener mounted on a fixed jig connected to a rotational moment measuring device, the pencil was rotated by hand on the opposite side of the sharpener until the lead was sharp. The peak value of the rotational moment during this process was measured, and the ease of sharpening (cuttability) was evaluated according to the following evaluation criteria. If this value is less than 0.1 N, it can be easily sharpened, and if it exceeds 0.2 N·m, it can be said that it is hard and difficult to sharpen. Evaluation criteria: ○: Easily cut (less than 0.1 N·m) △: Can be cut (0.1 N·m or more, less than 0.2 N·m) ×: Difficult to cut (0.2 N·m or more) 【0044】 [Table 1] 【0045】 Considering the evaluation results in Table 1 above, it was confirmed that Examples 1 to 9, which fall within the scope of the present invention, possess the same easy-to-shape properties as the conventional Comparative Examples 1 and 2, while being easy to manufacture with minimal environmental impact. Furthermore, in Examples 2 to 9, by maintaining a high natural origin index and keeping the inorganic powder ratio in the binder below 60%, evaluation was conducted by subjecting the pencils to 10 free drops from a height of 75 cm onto a concrete floor. No damage was observed to the pencil or cosmetic body, or the pencil lead or rod-shaped cosmetic, confirming sufficient drop resistance. Moreover, in Examples 5, 6, and 8, when carboxymethylcellulose ammonium was used as a naturally derived binder to make it water-insoluble, or when crosslinked with a crosslinking agent having a carboxylic acid group that crosslinks with esters, water resistance (water resistance after immersion of the manufactured pencils in purified water for 24 hours) was evaluated, and it was confirmed that they did not disintegrate, demonstrating sufficient water resistance. [Industrial applicability] 【0046】 This process yields pencils or cosmetic shafts suitable for pencil leads (including colored pencil leads), eyeliners, eyebrow pencils, eyeshadows, and other stick-shaped cosmetic products.

Claims

[Claim 1] A pencil or cosmetic shaft comprising a pencil lead or a rod-shaped cosmetic coated with a shaft material composition, wherein the shaft material composition contains at least a naturally derived binder selected from group A below and a naturally derived binder selected from group B below. Group A: Sawdust with an average particle size of 10 mesh to 200 mesh; wood powder with an average particle size of 100 μm to 2000 μm; powdered cellulose with an average particle size of 10 to 100 μm; naturally derived inorganic powder with an average particle size of 1 μm to 50 μm. Group B: Cellulose nanofiber, methylcellulose, methylcellulose sodium salt, methylcellulose NH ４ Salt, methylcellulose Ca salt, carboxymethylcellulose, carboxymethylcellulose Na salt, carboxymethylcellulose NH ４ Salt, carboxymethylcellulose Ca salt, hydroxymethylpropylcellulose, hydroxymethylpropylcellulose Na salt, hydroxymethylpropylcellulose NH ４ Salt, hydroxymethylpropylcellulose Ca salt, cellulose acetate, cellulose acetate Na salt, cellulose acetate NH ４ Salt, calcium cellulose acetate, sodium alginate [Claim 2] The shaft material composition is characterized in that the naturally derived index (excluding water) is 75% or more, as described in claim 1, for the shaft of a pencil or cosmetic product. [Claim 3] The pencil or cosmetic shaft according to claim 1 or 2, characterized in that the naturally derived binder is carboxymethylcellulose or carboxymethylcellulose sodium salt, carboxymethylcellulose NH4 salt, or carboxymethylcellulose Ca salt. [Claim 4] The shaft material composition further contains a crosslinking agent having a carboxylic acid group that ester-crosslinks the binder, characterized in that it is a pencil or cosmetic shaft according to any one of claims 1 to 3. [Claim 5] A pencil comprising at least a pencil lead and a shaft body formed by covering the pencil lead, wherein the shaft body is the shaft body described in any one of claims 1 to 4. [Claim 6] A stick-shaped cosmetic comprising at least a stick-shaped cosmetic and a shaft formed by coating and molding the stick-shaped cosmetic, wherein the shaft is the shaft described in any one of claims 1 to 4.

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