JP2023055154A - Eraser - Google Patents

Abstract

To provide an eraser which can be used as a substitute for a touch pen or a stylus pen for directly inputting information to a display of an information equipment terminal, and which can maintain excellent erasability.SOLUTION: The eraser of the present invention includes a continuously extending conductive erasing portion, and a non-conductive erasing portion disposed alongside the conductive erasing portion, in which, on the same side, both a part of the conductive erasing portion and a part of the non-conductive erasing portion are exposed. According to the present invention, it is possible to perform both erasing on paper and inputting information to an information equipment terminal without switching between the eraser and a stylus pen or a touch pen as in the conventional art.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an eraser, and more particularly to an eraser having both excellent stylus function and erasability.

2. Description of the Related Art In recent years, many information equipment terminals such as computers, tablets, and smartphones employ a technology that enables character input by handwriting directly on a display. On the other hand, due to the pandemic of the new coronavirus infection (COVID-19) that occurred in 2019, tablet terminals are distributed to children or students at elementary, junior high, and high schools, etc., to secure educational opportunities through distance learning. There is a growing movement to try In addition, the securing of educational opportunities through distance learning is not limited to these, and is also widely adopted by universities, vocational schools, cram schools, and entrance exam preparation schools.

In such an educational setting, preschoolers such as pupils, pupils, and students often place their information equipment terminals on their desks and attend classes. As a result, in addition to textbooks, notebooks, pencils or mechanical pencils, felt-tip pens, rulers, erasers (erasers), touch pens and stylus pens used to input characters to the information device terminal and the above-mentioned display will be placed on the desk. As a result, preschoolers are forced to take classes in a decidedly cluttered environment. Such a cluttered environment is the same when conducting online meetings.

Here, a contrivance has been proposed for freeing students from classes in such a cluttered environment. For example, Patent Literature 1 proposes providing a conductive function to a character eraser to assist character input to the information equipment terminal in place of a touch pen or stylus pen. Erases with conductive functionality are also useful as replacements for lost touch pens and stylus pens.

However, it is known that such eraser deteriorates erasability itself due to conductive fine particles such as graphite contained in order to obtain the conductive function. For this reason, it is possible to input characters on the display, but on the other hand, it is difficult to say that pencil characters written in a notebook or the like disappear very cleanly.

JP 2017-074713 A

An object of the present invention is to solve the above problems, and an object of the present invention is to provide an excellent erasing device that can be substituted for a touch pen or stylus pen that can directly input information to the display of an information equipment terminal. To provide an eraser capable of retaining character property.

The present invention comprises a continuously extending conductive erasable portion and a non-conductive erasable portion arranged alongside the conductive erasable portion,
An eraser in which both a portion of the conductive eraser portion and a portion of the non-conductive eraser portion are exposed on the same surface.

In one embodiment, the eraser is composed of two bottom surfaces and a side surface disposed between the two bottom surfaces,
Both a part of the conductive erasable part and a part of the non-conductive erasable part are exposed on the bottom surface, and a part of the electrically conductive erasable part is exposed on the side surface. there is

In a further embodiment, a portion of the conductive eraser portion is exposed in the center of the bottom surface.

In a further embodiment, the intersection of said bottom surface and said side surface comprises part of said non-conductive eraser portion.

In one embodiment, the eraser has a conductive sleeve arranged on the outermost periphery.

In one embodiment, the electrically conductive erasable portion contains a carbon source.

According to the present invention, it is possible to input information from the display of an information equipment terminal by using an excellent stylus function while maintaining erasability. As a result, it is possible to perform both erasing on paper and inputting information to the information equipment terminal without having to switch between the eraser and the stylus pen or touch pen as in the past.

It is a perspective view showing an example of the eraser of the present invention. 2 is a schematic diagram for explaining an example of the positional relationship between the eraser and fingers when the eraser shown in FIG. 1 is held with the right hand; FIG. (a) is a schematic diagram for explaining how the eraser shown in FIG. 1 is housed in a conductive sleeve as a main body, and (b) is a hand holding the eraser provided with the conductive sleeve shown in (a). FIG. 10 is a schematic diagram for explaining how to do; (a) to (l) are views of each eraser seen from the bottom direction for explaining other examples of the eraser of the present invention. 2 is a photograph of the bottom surface of the eraser samples produced in Examples 2-4 and Comparative Examples 3-4.

The present invention will be described in detail below.

FIG. 1 is a perspective view showing an example of the eraser of the present invention.

The eraser 100 shown in FIG. 1 is composed of two bottom surfaces 102a and 102b and a side surface 104 provided between the bottom surfaces 102a and 102b. In FIG. 1, the side surface 104 is composed of four rectangular surfaces 104a, 104b, 104c, 104d, and the eraser 100 is described as having a rectangular parallelepiped shape, but the present invention is not necessarily limited thereto. For example, it may have the form of a cylinder with side surfaces consisting of curved surfaces arranged between two circular bases, and three rectangular surfaces between two triangular bases. It may have the form of a triangular prism with the side surfaces arranged on the same side, or between the bases of two polygons (e.g., triangles, excluding squares), side surfaces composed of a plurality of corresponding rectangular surfaces are arranged. It may have the form of a polygonal prism.

The eraser 100 of the present invention comprises a conductive eraser portion 110 and a non-conductive eraser portion 120 .

The conductive eraser portion 110 is shaped to extend continuously (ie, integrally rather than intermittently) within the eraser 100 . The conductive erasable portion 110 is itself conductive and can react to the static electricity of a human body touching it to cause a change in capacitance. Furthermore, the conductive erasable portion 110 itself has an appropriate erasability.

Conductive erasable portion 110 contains a base component and a carbon source.

Base material components include, for example, thermoplastic elastomers, vinyl chloride resins, and rubbers, and combinations thereof.

Examples of thermoplastic elastomers include styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, acrylic-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and nylon-based thermoplastic elastomers. , and chlorinated polyethylene copolymer crosslinked alloys, and combinations thereof. Styrene-based thermoplastic elastomers are preferred because they are excellent in erasability. More specific examples of styrene-based thermoplastic elastomers include SBS (styrene-butadiene-styrene block copolymer)-based thermoplastic elastomers.

Examples of vinyl chloride resins include vinyl chloride resins (PVC). The vinyl chloride resin that can constitute the conductive erasable portion 110 is preferably a paste vinyl chloride resin having an average degree of polymerization of 650-5000, more preferably 700-3700, still more preferably 1100-1500. In the present invention, if the average degree of polymerization of the vinyl chloride resin is less than 650, the hardness of the resulting eraser is lowered, and the erasability of the conductive eraser portion itself is lowered, resulting in a sufficient amount of the eraser as a whole. Erasability may not be obtained. When the average degree of polymerization of the vinyl chloride resin exceeds 5,000, matching with the plasticizer becomes relatively difficult, and the resulting eraser may easily break. The vinyl chloride resin may be a homopolymer of vinyl chloride, or a copolymer containing vinyl chloride as a structural unit mainly and containing vinyl acetate, ethylene, methyl acrylate, methyl methacrylate, etc. as a comonomer. In the present invention, it is preferable that the vinyl chloride resin is composed of a homopolymer of vinyl chloride in order to obtain appropriate flexibility.

Examples of rubbers include natural and synthetic rubbers, and combinations thereof. Specific examples of synthetic rubbers include diene-based rubbers such as isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, and combinations thereof; butyl rubber, ethylene-propylene rubber, urethane rubber, silicone non-diene rubbers such as rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, epichlorohydrin rubber, and fluororubber, and combinations thereof;

The carbon source is added as a filler in the eraser and to impart conductivity to the conductive eraser portion 110 . Carbon sources that may comprise the conductive erasable portion 110 include, for example, graphite, carbon fibers, carbon nanofibers and carbon black, and combinations thereof. The carbon source is preferably carbon black because of its versatility and ready availability. The content of the carbon source in the conductive eraser portion 110 is preferably 4% to 30% by weight, more preferably 5% to 15% by weight, based on the total weight of the eraser of the present invention. If the carbon source content in the conductive eraser portion 110 is less than 4% by mass, the conductive eraser portion will not have sufficient conductivity and the resulting eraser will not have satisfactory stylus function. sometimes not. If the content of the carbon source in the electrically conductive erasable part 110 exceeds 30% by mass, the erasability of the electrically conductive erasable part itself is impaired, and the resulting eraser does not have satisfactory erasability. sometimes not.

The conductive erasable portion 110 also preferably contains a filler material.

The filler plays a role of appropriately disintegrating the eraser itself by turning into eraser crumbs when the eraser is used. Through such moderate disintegration, the erasability of the eraser can be enhanced. On the other hand, the conductive eraser portion 110 constituting the eraser 100 of the present invention contains the carbon source as described above. Since the carbon source also plays the same role as the filler in a broad sense, the filler contained in the eraser 100 of the present invention is preferably composed of filler components other than the carbon source.

Examples of fillers that may be included in conductive erasable portion 110 include calcium carbonate and talc, and combinations thereof. The conductive erasable portion 110 preferably contains calcium carbonate as a filler because of its versatility and availability. The content of the filler contained in the conductive erasable portion 110 is preferably 30 to 330 parts by mass, more preferably 60 parts by mass, with respect to 100 parts by mass of the base material component contained in the conductive erasable portion 110. Parts by mass to 280 parts by mass. If the content of the filler that can be contained in the conductive erasable part 110 is less than 30 parts by mass, the resulting eraser may have a reduced overall erasability. If the content of the filler that can be contained in the conductive erasable portion 110 exceeds 330 parts by mass, the ability of the conductive erasable portion 110 to remove writing lines during use decreases, resulting in a decrease in erasability. There is

The electrically conductive erasable portion 110 may also contain softeners (plasticizers) to impart adequate flexibility and abrasion resistance.

Examples of emollients include process oils, phthalates, adipates, and polyesters, and combinations thereof. In the present invention, for example, when the base component constituting the conductive erasable part 110 is a thermoplastic elastomer, the softener is process oil because of its good compatibility with the base component. When the base material constituting the conductive erasable part 110 is a vinyl chloride resin, the softening agent is preferably phthalate ester, adipate ester, polyester, or a combination thereof. .

Although the content of the softening agent is not necessarily limited in the present invention, it is preferably 30 to 200 parts by mass, more preferably 40 to 150 parts by mass, based on 100 parts by mass of the base component. If the content of the softening agent is less than 30 parts by mass, the resulting eraser may become hard, and the adhesiveness may be lowered, resulting in deterioration of erasability. If the content of the softening agent exceeds 200 parts by mass, the hardness of the eraser may be lowered, making it difficult to use.

In the present invention, the conductive erasable portion 110 may also contain other components within the range that does not significantly impair the conductivity, erasability, and the like. Such other ingredients include, for example, stabilizers and colorants and combinations thereof.

The stabilizer is generally used in the field of resin molding, and is preferably a heat stabilizer for the base material component (eg, vinyl chloride resin). Examples of heat stabilizers for vinyl chloride resins include metal soaps of metals such as barium, zinc and calcium and organic acids such as stearic acid, lauric acid, ricinoleic acid, naphthenic acid and 2-ethylhexoic acid. Other examples of stabilizers include antioxidants, UV absorbers, and light stabilizers. Examples of antioxidants include hindered phenol antioxidants, phosphorus antioxidants, and sulfur antioxidants. Examples of UV absorbers include benzotriazole UV absorbers, triazine UV absorbers, benzophenone UV absorbers, cyanoacrylate UV absorbers, salicylate UV absorbers, and oxanilide UV absorbers. Examples of light stabilizers include various hindered amine light stabilizers, oxalic acid derivatives, salicylic acid derivatives, and hydrazine derivatives.

The colorant is preferably one that is commonly used for base components. Examples of colorants include inorganic pigments, organic pigments, disperse dyes, and reactive dyes.

The non-conductive erasable portion 120 is positioned alongside the conductive erasable portion 110 within the eraser 100 . In eraser 100, such an arrangement may be made, for example, by co-extrusion of the material of conductive eraser portion 110 and the non-conductive eraser portion 120, or After the 110 and the non-conductive erasable portion 120 are once separately produced, they may be thermally welded to each other or bonded together with a predetermined adhesive to be integrated.

The non-conductive eraser portion 120 is itself not conductive (i.e., non-conductive), or less conductive than the conductive eraser portion 110. It has properties different from those of the character portion 110 . Furthermore, the non-conductive erasable portion 120 itself has sufficient erasability.

The non-conductive erasable portion 120 contains the same base component as the conductive erasable portion 110 (for example, thermoplastic elastomer, vinyl chloride resin such as vinyl chloride resin (PVC), and/or rubber). .

Furthermore, the non-conductive erasable portion 120, like the electrically conductive erasable portion 110, contains filler components other than the carbon source. Non-conductive erasable portion 120 preferably contains calcium carbonate as a filler because of its versatility and availability. The content of other fillers that can be contained in the non-conductive erasable portion 120 is preferably 50 parts by mass to 350 parts by mass with respect to 100 parts by mass of the base material component contained in the non-conductive erasable portion 120. More preferably, it is 80 parts by mass to 300 parts by mass. If the content of other fillers that may be included in the non-conductive eraser portion is less than 50 parts by mass, the resulting eraser may have a reduced overall erasability. If the content of other fillers that can be contained in the non-conductive erasable part exceeds 350 parts by mass, the ability to remove writing lines in the non-conductive erasable part 120 during use decreases, resulting in poor erasing performance. may decrease.

The non-conductive erasable portion 120 also contains softeners (plasticizers) and/or other ingredients (e.g., stabilizers and colorants and combinations thereof) similar to the electrically conductive erasable portion 110 described above. good too. The content of the softener and/or other ingredients that can be contained in the non-conductive erasable portion 120 is the same as that that can be contained in the conductive erasable portion 110, for example, and the appropriate content is selected by those skilled in the art. can be

Referring again to FIG. 1, the eraser 100 of the present invention exposes both a portion of the conductive eraser portion 110 and a portion of the non-conductive eraser portion 120 on the same side.

For example, in FIG. 1, the conductive erasable portions 110 are arranged in a cross shape on the bottom surface 102a, and the non-conductive erasable portions 120 are arranged side by side at the four corners of the cross-shaped conductive erasable portions 110. . As a result, both the conductive erasable portion 110 and the non-conductive erasable portion 120 are both exposed on the bottom surface 102a.

On the other hand, in FIG. 1, the rectangular surfaces 104b, 104c, etc. of the side surface 104 are kept partially exposed. More specifically, in the embodiment shown in FIG. 1, both a portion of the conductive erasable portion 110 and a portion of the non-conductive erasable portion 120 are exposed on the rectangular surfaces 104b, 104c, etc. of the side surface 104. kept in good condition.

In the eraser 100 of the present invention, the conductive eraser portion 110 and the non-conductive eraser portion 120 are arranged in such a state. , one or more of thumb 212, index finger 214, and middle finger 216 can touch conductive eraser portion 110 exposed on side 104 of eraser 100. FIG. In addition, since the conductive erasable portion 110 appearing on the side surface 104 also appears continuously on the bottom surface 102a, when the display of the information equipment terminal touches the conductive erasing portion 110 on the bottom surface 102a, the display It becomes possible to perform operations such as inputting characters.

On the other hand, when using the eraser 100 of the present invention to erase (delete) the writing lines written with a pencil or mechanical pencil on the paper surface, the non-conductive eraser portions 120 arranged at the four corners are in contact with the paper surface. It comes in contact with more characters, making it possible to erase characters in the same way as conventional erasers. Particularly, as shown in FIG. 1, the crossing portions (intersecting sides) of the bottom surfaces 102a and 102b and the side surface 104 are part of the non-conductive erasable portion 120, so that when erasing, the paper surface The upper writing line can be contacted more by the non-conductive erasable portion 120 located at this intersection.

In addition, since the conductive erasable portion 110 itself has appropriate erasability, even after the non-conductive erasable portions 120 at the four corners and/or the crossing portions are scraped off due to use, the remaining non-conductive Both the erasable part 120 and the conductive erasable part 110 can keep the erasability high.

It is conceivable that the four corners of the bottom surface 102a or 102b of the eraser 100 are scraped preferentially over the center of the bottom surface 102a or 102b due to the erasing of the writing lines on the paper surface, and the center protrudes compared to the four corners. In such a case, in the embodiment shown in FIG. 1, since the conductive erasable part 110 is exposed at the center, it becomes easier to touch the display of the information equipment terminal, and operability such as character input can be improved. .

FIG. 3(a) is a schematic diagram for explaining how the eraser shown in FIG. 1 is housed in a conductive sleeve as a main body.

In another embodiment of the present invention, the eraser 300 may have a conductive sleeve 340 disposed at the outermost periphery of the eraser body 100 corresponding to the eraser shown in FIG.

The conductive sleeve 340 is a case that accommodates the eraser main body 100, and its inner and outer surfaces are made of a conductive material. Examples of materials that constitute the conductive sleeve 340 include conductive metals such as aluminum, iron, and copper; paper or resin provided with a conductive film or conductive coating; and the like. The inner surface of the conductive sleeve 340 is sized to contact at least a portion of the outer surface of the eraser body 100 (especially the sides 104).

With the eraser body 100 housed in the conductive sleeve 340, when a human hand grasps the eraser 300, one or more of the thumb 312, the index finger 314, and the middle finger 316, as shown in FIG. More can touch the exposed conductive eraser portion 110 on the side 104 through the conductive sleeve 340 of the eraser 300 . In addition, since the conductive erasable portion 110 appearing on the side surface 104 also appears continuously on the bottom surface 102a, when the display of the information equipment terminal touches the conductive erasing portion 110 on the bottom surface 102a, the display It becomes possible to perform operations such as inputting characters.

On the other hand, when using the eraser 300 of the present invention to erase (delete) the writing lines written by a pencil or mechanical pencil on the paper surface, the non-conductive eraser portions 120 arranged at the four corners are in contact with the paper surface. It comes in contact with more characters, making it possible to erase characters in the same way as conventional erasers.

1 to 3, the erasers 100 and 300 in which the non-conductive eraser portions 120 are arranged at the four corners of the cross-shaped conductive eraser portion 110 in the direction of the bottom surface 102a have been described. Not limited to configuration.

The eraser of the present invention may have a conductive eraser portion and a non-conductive eraser portion arranged in the bottom direction, for example, in the form shown in FIGS. 4(a) to 4(l). 4, the upper surface of the drawing is referred to as the upper surface 402, the lower surface of the drawing is referred to as the lower surface 404, the left surface of the drawing is referred to as the left surface 406, and the right surface of the drawing is referred to as the right surface 408. will be named and explained.

The eraser of the present invention may have a structure as shown in FIG. 4(a), for example. In FIG. 4(a), portions of conductive erasable portion 410a are exposed on left side 406 and right side 408 and are not exposed on top surface 402 and bottom surface 404. FIG. On the other hand, part of the non-conductive erasable portion 420a is arranged so as to be exposed on the upper surface 402 and the lower surface 404. As shown in FIG.

In this case, when a person's hand contacts conductive eraser portion 410a exposed on either left side 406 or right side 408, eraser 400a provides a stylus function with the contacted conductive eraser portion 410a. In addition, the eraser 400a can exhibit excellent erasability through the non-conductive eraser portion 420a.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(b). In FIG. 4B, a portion of conductive erasable portion 410b is exposed on top surface 402 and bottom surface 404, and is not exposed on left side surface 406 and right side surface 408. In FIG. On the other hand, portions of the non-conductive eraser portion 420b are arranged so as to be exposed on the left side 406 and the right side 408. As shown in FIG.

In this case, when a person's hand contacts conductive eraser portion 410b exposed on either top surface 402 or bottom surface 404, eraser 400b exerts a stylus function by contacting conductive eraser portion 410b. Also, the eraser 400b can exhibit excellent erasability through the non-conductive eraser portion 420b.

Alternatively, the eraser of the present invention may have a structure such as that shown in FIG. 4(c). In FIG. 4C, a portion of conductive erasable portion 410c is exposed on top surface 402, left side 406 and right side 408, and is not exposed on bottom surface 404. In FIG. On the other hand, portions of the non-conductive eraser portion 420c are arranged so as to be exposed on the bottom surface 404, the left side surface 406 and the right side surface 408, respectively.

In this case, when a person's hand contacts conductive eraser portion 410c exposed on either top surface 402, left side 406 or right side 408, eraser 400c performs stylus function with contacted conductive eraser portion 410c. Demonstrate. Also, the eraser 400c can exhibit excellent erasability through the non-conductive eraser portion 420c.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(d). In (d) of FIG. 4 , a portion of each of the two vertically extending conductive eraser portions 410 d is exposed on the upper surface 402 and the lower surface 404 , and is not exposed on the left side surface 406 and the right side surface 408 . do not have. On the other hand, the non-conductive erasable portion 420d is arranged vertically between and on both sides of the two conductive erasable portions 410d, some of which are the upper surface 402, the lower surface 404, the left side 406 and the right side. 408 is exposed.

In this case, when a person's hand contacts conductive erasable portion 410d exposed on either top surface 402 or bottom surface 404, eraser 400d exerts a stylus function by contacting conductive erasable portion 410d. Also, the eraser 400d can exhibit excellent erasability through the non-conductive eraser portion 420d.

Alternatively, the eraser of the present invention may have a structure such as that shown in FIG. 4(e). 4(e), a portion of each of the two laterally extending conductive eraser portions 410e is exposed on the left side 406 and right side 408, and is not exposed on the upper surface 402 and the lower surface 404. In FIG. do not have. On the other hand, the non-conductive erasable portion 420e is laterally disposed between and on each side of the two conductive erasable portions 410e, some of which are the upper surface 402, the lower surface 404, the left side 406 and the right side. 408 is exposed.

In this case, when a person's hand touches the conductive eraser portion 410e exposed on either the left side 406 or the right side 408, the eraser 400e exerts a stylus function with the contacted conductive eraser portion 410e. In addition, the eraser 400e can exhibit excellent erasability through the non-conductive eraser portion 420e.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(f). In FIG. 4( f ), portions of conductive erasable portion 410 f are exposed on top surface 402 , bottom surface 404 and left side surface 406 , but are not exposed on right side surface 408 . On the other hand, the non-conductive erasable portion 420f is disposed on the right side of the conductive erasable portion 410f, and is partially exposed on the top surface 402, the bottom surface 404, and the right side surface 408.

In this case, when a person's hand contacts conductive eraser portion 410f exposed on either top surface 402, bottom surface 404, or left side surface 406, eraser 400f exerts a stylus function with the contacted conductive eraser portion 410f. do. Also, the eraser 400f can exhibit excellent erasability through the non-conductive eraser portion 420f.

Alternatively, the eraser of the present invention may have a structure such as that shown in FIG. 4(g). In (g) of FIG. 4, a part of each of the two vertically extending conductive eraser portions 410(1)g and 410(2)g is exposed on the upper surface 402 and the lower surface 404, and the left side surface 406 and right side 408 are not exposed. A portion of one laterally extending conductive erasable portion 410 ( 3 ) g is exposed on the left side 406 and right side 408 and not exposed on the top surface 402 and bottom surface 404 . Furthermore, the conductive erasable portions 410(1)g and 410(2)g extending in the vertical direction and the conductive erasable portion 410(3)g extending in the lateral direction intersect each other inside and are integrated. there is On the other hand, the non-conductive erasable portion 420g is disposed between these electrically conductive erasable portions 410(1)g, 410(2)g, 410(3)g, some of which are on the upper surface 402 and the lower surface. 404 , are arranged to be exposed on left side 406 and right side 408 .

In this case, a person's hand contacts the exposed conductive erasure portions 410(1)g, 410(2)g, 410(3)g on either the top surface 402, bottom surface 404, left side 406 or right side 408. Then, the eraser 400g exhibits a stylus function by the contacting conductive eraser portions 410(1)g, 410(2)g, and 410(3)g. Also, the eraser 400g can exhibit excellent erasability through the non-conductive eraser portion 420g.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(h). In (h) of FIG. 4 , part of one vertically extending conductive eraser portion 410 ( 1 ) h is exposed on the upper surface 402 , the lower surface 404 and the left side surface 406 , and is exposed on the right side surface 408 . not. A portion of one laterally extending conductive erasable portion 410 ( 2 ) h is exposed on the bottom surface 404 , the left side surface 406 and the right side surface 408 , and is not exposed on the top surface 402 . Further, the vertically extending conductive erasable portion 410(1)h and the laterally extending electrically conductive erasable portion 410(2)h intersect with each other inside and are integrated. On the other hand, the non-conductive erasable portion 420h is arranged so as to fill the portions other than the conductive erasable portions 410(1)h and 410(2)h. arranged to be exposed.

In this case, when a person's hand contacts conductive eraser portions 410(1)h, 410(2)h exposed on either top surface 402, bottom surface 404 or left side surface 406, eraser 400h contacts conductive eraser 400h. The stylus function is exhibited by the erasable portions 410(1)h and 410(2)h. In addition, the eraser 400h can exhibit excellent erasability through the non-conductive eraser portion 420h.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(i). In FIG. 4(i), a portion of one vertically extending conductive eraser portion 410(1)i is exposed on the upper surface 402, the lower surface 404 and the left side 406, and is exposed on the right side 408. not. Also, a portion of one laterally extending conductive eraser portion 410(2)i is exposed on left side 406 and right side 408 and not exposed on top surface 402 and bottom surface 404. FIG. Further, the vertically extending conductive erasable portion 410(1)i and the laterally extending electrically conductive erasable portion 410(2)i intersect each other inside and are integrated. On the other hand, the non-conductive erasable portion 420h is arranged so as to fill the portions other than these conductive erasable portions 410(1)i and 410(2)i, and a part thereof is the upper surface 402, the lower surface 404 and the right side. It is arranged so as to be exposed on the surface 408 .

In this case, when a person's hand contacts conductive eraser portions 410(1)i, 410(2)i exposed on either top surface 402, bottom surface 404 or left side surface 406, eraser 400i will become conductive. The stylus function is exhibited by the erasable portions 410(1)i and 410(2)i. Also, the eraser 400i can exhibit excellent erasability through the non-conductive eraser portion 420i.

Alternatively, the eraser of the present invention may have a structure such as that shown in FIG. 4(j). In (j) of FIG. 4, part of one vertically extending conductive eraser portion 410(1)j is exposed on the top surface 402, the bottom surface 404 and the left side surface 406, and is exposed on the right side surface 408. not. Part of another conductive erasable portion 410(2)j extending in the vertical direction is exposed on the upper surface 402 and the lower surface 404, and is not exposed on the left side surface 406 and the right side surface 408. . In addition, a portion of one laterally extending conductive eraser portion 410 ( 3 ) j is exposed on the left side 406 and not exposed on the top 402 , bottom 404 and right side 408 . Furthermore, the conductive erasable portions 410(1)j and 410(2)j extending in the vertical direction and the electrically conductive erasing portion 410(3)j extending in the lateral direction intersect each other inside and are integrated. ing. On the other hand, the non-conductive erasable portion 420g is disposed between these conductive erasable portions 410(1)j, 410(2)j, 410(3)j, some of which are on the upper surface 402 and the lower surface. 404 and right side 408 are exposed.

In this case, when a human hand contacts conductive eraser portions 410(1)j, 410(2)j, 410(3)j exposed on either top 402, bottom 404 or left side 406, the eraser 400j provides a stylus function by contacting conductive erasable portions 410(1)j, 410(2)j, 410(3)j. Also, the eraser 400j can exhibit excellent erasability through the non-conductive eraser portion 420j.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(k). In (k) of FIG. 4, part of one vertically extending conductive erasable part 410(1)k is exposed on the upper surface 402 and the lower surface 404, and is exposed on the left side 406 and the right side 408. not. A portion of one laterally extending conductive erasable portion 410 ( 2 ) k is exposed on left side 406 and not exposed on top 402 , bottom 404 and right side 408 . Further, the vertically extending conductive erasable portion 410(1)k and the laterally extending electrically conductive erasable portion 410(2)k intersect each other inside and are integrated. On the other hand, the non-conductive erasable portion 420g is arranged so as to fill the portions other than these conductive erasable portions 410(1)k and 410(2)k. It is arranged to be exposed on the right side 408 and the left side 408 .

In this case, when a person's hand contacts conductive eraser portions 410(1)k, 410(2)k exposed on either top surface 402, bottom surface 404, or left side surface 406, eraser 400k will become conductive. The stylus function is exhibited by the erasable portions 410(1)k and 410(2)k. Also, the eraser 400k can exhibit excellent erasability through the non-conductive eraser portion 420k.

Alternatively, the eraser of the present invention may have a structure as shown, for example, in FIG. 4(k). In (k) of FIG. 4, part of one vertically extending conductive erasable part 410(1)k is exposed on the upper surface 402 and the lower surface 404, and is exposed on the left side 406 and the right side 408. not. A portion of one laterally extending conductive erasable portion 410 ( 2 ) k is exposed on left side 406 and not exposed on top 402 , bottom 404 and right side 408 . Further, the vertically extending conductive erasable portion 410(1)k and the laterally extending electrically conductive erasable portion 410(2)k intersect each other inside and are integrated. On the other hand, the non-conductive erasable portion 420g is arranged so as to fill the portions other than these conductive erasable portions 410(1)k and 410(2)k. It is arranged to be exposed on the right side 408 and the left side 408 . In this case, when a person's hand contacts conductive eraser portions 410(1)k, 410(2)k exposed on either top surface 402, bottom surface 404, or left side surface 406, eraser 400k will become conductive. The stylus function is exhibited by the erasable portions 410(1)k and 410(2)k. Also, the eraser 400k can exhibit excellent erasability through the non-conductive eraser portion 420k.

Alternatively, the eraser of the present invention may have a structure as shown in FIG. 4(l), for example. In (l) of FIG. 4, one conductive erasable part 410l is arranged at one corner in the direction of the bottom surface, part of which is exposed on the top surface 402 and the right side surface 408, and is partially exposed on the bottom surface 404 and the left side surface 406. not exposed. On the other hand, the non-conductive erasable portion 420k is arranged so as to bury the portions other than the conductive erasable portion 410l, and part of them are exposed on the upper surface 402, the lower surface 404, the right side 408 and the left side 408. are arranged as

In this case, when a person's hand contacts conductive eraser portion 410l exposed on either top surface 402 or right side surface 408, eraser 400l exerts a stylus function by contacting conductive eraser portion 410l. Also, the eraser 400l can exhibit excellent erasability through the non-conductive eraser portion 420l.

The eraser of the present invention is produced, for example, by separately melt-kneading the components constituting the conductive erasable portion and the components constituting the non-conductive erasable portion, and then co-extrusion of the two. can do. Alternatively, the conductive erasable portion and the non-conductive erasable portion may be formed by extrusion molding or the like, respectively, and then bonded together using an adhesive or the like well known in the art.

The molding temperature is not necessarily limited, but is, for example, 100° C. to 130° C., preferably 110° C. to 120° C., and the heating time is, for example, 20 minutes to 40 minutes. For example, the eraser of the present invention can be obtained by cooling to a predetermined temperature after co-extrusion and cutting into a predetermined size.

As described above, the eraser of the present invention has a conductive eraser portion and a non-conductive eraser portion. By manually grasping the conductive erasable portion or the conductive sleeve, the stylus function can be exerted from any part of the eraser where the conductive erasable portion is present. In addition, since a non-conductive erasable portion also appears on the surface, excellent erasability can be exhibited for writing lines drawn with a pencil or mechanical pencil on the paper surface. In addition, since the conductive erasable part is arranged to extend continuously within the eraser, even if the eraser itself becomes worn through use, the stylus function and erasability will remain the same as when it was new. and can demonstrate both.

This eliminates the need to separately prepare a stylus pen or a touch pen in addition to the eraser of the present invention on the attendee's desk when conducting remote classes or online meetings. Alternatively, even if the stylus pen or touch pen is lost, the eraser of the present invention can be used as a substitute.

EXAMPLES The present invention will be described in detail below with reference to Examples, but the present invention is not limited to these Examples.

(Example 1: Production of eraser sample (E1))
100 parts by mass of a styrene-based thermoplastic elastomer (SBS), 250 parts by mass of heavy calcium carbonate, and 45 parts by mass of process oil were heated and kneaded in a kneader to prepare dough (1). On the other hand, 100 parts by mass of styrene-based thermoplastic elastomer (SBS), 220 parts by mass of heavy calcium carbonate, 40 parts by mass of carbon black, and 45 parts by mass of process oil are heated and kneaded in a kneader to prepare dough (2). bottom. These fabrics (1) and (2) are extruded to their respective predetermined thicknesses, then superimposed, thermo-compressed, and cut to obtain a non-conductive eraser having a thickness of 4.5 mm in the bottom direction. part, a conductive eraser part with a thickness of 1.0 mm, and a non-conductive eraser part with a thickness of 4.0 mm are laminated in this order (the bottom surface has a structure as shown in FIG. 4(a)), A rectangular parallelepiped eraser sample (E1) (thickness: 9.5 mm, width: 15.5 mm, length: 50.0 mm) was obtained. In this eraser sample (E1), both the conductive eraser part and the non-conductive eraser part were exposed on both the short sides and the bottom.

(Comparative Example 1: Production of eraser sample (C1))
Using the cloth (1) alone prepared in Example 1, extruding at a cylinder temperature of 100 ° C. and a screw rotation speed of 25 rpm, and cutting it, a rectangular parallelepiped eraser sample ( C1) (thickness: 9.5 mm, width: 15.5 mm, length: 50.0 mm) was obtained. In addition, in this eraser sample (C1), only the non-conductive eraser portions were exposed on both the short side surfaces and the bottom surface.

(Comparative Example 2: Production of eraser sample (C2))
Using the cloth (2) alone produced in Example 1, extruding at a cylinder temperature of 100° C. and a screw rotation speed of 25 rpm, and cutting it, a rectangular parallelepiped eraser sample (C2 ) (thickness: 9.5 mm, width: 15.5 mm, length: 50.0 mm) was obtained. In this eraser sample (C2), only the conductive eraser portions were exposed on both the short sides and the bottom.

(smartphone operability)
Two short sides of the eraser sample (E1) obtained in Example 1 were gripped with the thumb and forefinger, and the bottom surface of the sample (E1) was pressed against the display of the smartphone. In this state, the eraser sample (E1) was slid in parallel on the display, and the operability of the smartphone on the display was confirmed as the sample (E1) moved. Table 1 shows the results.

For the eraser samples (C1) and (C2) obtained in Comparative Examples 1 and 2, the two short sides were held between the thumb and forefinger in the same manner as above and pressed against the display of the smartphone, and the sample (C1) and the operability of the smartphone on the display accompanying the movement of (C2). Table 1 shows the results.

(Measurement of HB pencil erasure rate)
Each bottom surface (contact portion of the test paper) of the eraser samples (E1), (C1) and (C2) obtained in Example 1 and Comparative Examples 1 and 2 was scraped into an arc with a radius of 6±1 mm, and the test piece got Using these test pieces, the HB pencil erasure rate of the obtained samples was measured according to JIS S 6050 (2002). Table 2 shows the results.

As shown in Table 1, the eraser sample (E1) obtained in Example 1 has good operability of the smartphone and a high erasure rate, exhibiting a stylus function and excellent erasing. It can be seen that compatibility with sexuality is possible. On the other hand, the eraser sample (C1) of Comparative Example 1 has excellent erasability, but lacks the stylus function, and the eraser sample (C2) of Comparative Example 2 exhibits the stylus function, but does not have the stylus function. All the eraser samples were difficult to achieve both of the above.

(Example 2: Production of eraser sample (E2))
After the fabric (1) and the fabric (2) prepared in Example 1 are extruded to each predetermined thickness, each is cut to a predetermined width, fixed at a predetermined position, thermocompressed, and cut. As a result, a rectangular parallelepiped eraser sample (E2) (thickness: 11 mm, width: 21 mm, length: 50.0 mm). Regarding this eraser sample (E2), the thickness of each of the non-conductive eraser portion (lower surface side) on the short side in the bottom direction, the conductive eraser portion, and the non-conductive eraser portion (upper surface side) is , 3 mm, 5 mm and 3 mm, and the thickness of each of the non-conductive erasable part (lower side) on the long side, the conductive erasable part and the non-conductive erasable part (upper side) is 7 mm. there were. Moreover, in this eraser sample (E2), both a part of the conductive eraser part and a part of the non-conductive eraser part were exposed on both the short side surface and the bottom surface.

(Example 3: Production of eraser sample (E3))
After extruding the fabric (1) and the fabric (2) prepared in Example 1 to each predetermined thickness, the two fabrics are superimposed, thermocompressed, and cut.
An 11-step striped rectangular parallelepiped eraser sample (E3 ) (thickness: 11 mm, width: 21 mm, length: 50.0 mm) was obtained. In this eraser sample (E3), the thickness of the layer of the conductive eraser portion and the layer of the non-conductive eraser portion on the short side in the bottom direction were both 1 mm. Moreover, in this eraser sample (E3), both a part of the conductive eraser part and a part of the non-conductive eraser part were exposed on both the short sides and the bottom.

(Example 4: Production of eraser sample (E4))
After extruding the fabric (1) and the fabric (2) prepared in Example 1 to each predetermined thickness, the two fabrics are superimposed, thermocompressed, and cut.
As shown in FIG. 5(c), two layers of non-conductive erasable parts and one layer of electrically conductive erasable parts disposed therebetween are laminated in the bottom direction, and a three-tiered rectangular parallelepiped An eraser sample (E4) (thickness: 11 mm, width: 21 mm, length: 50.0 mm) was obtained. In this eraser sample (E4), the thickness of the layer of the conductive eraser portion on the short side in the bottom direction was 5 mm, and the thickness of the two non-conductive eraser portions was 3 mm. rice field. In this eraser sample (E4), both the conductive eraser part and the non-conductive eraser part were exposed on both the short sides and the bottom.

(Comparative Example 3: Production of eraser sample (C3))
Using the fabric (2) alone prepared in Example 1, extruding at a cylinder temperature of 100 ° C. and a screw rotation speed of 25 rpm, and cutting it, it is composed only of the conductive erasable part shown in (d) of FIG. A rectangular parallelepiped eraser sample (C3) (thickness: 11 mm, width: 21 mm, length: 50.0 mm) was obtained. In this eraser sample (C3), only the conductive eraser portions were exposed on both the short sides and the bottom.

(Comparative Example 4: Production of eraser sample (C4))
Using the fabric (1) alone produced in Example 1, extruding and cutting at a cylinder temperature of 100 ° C. and a screw rotation speed of 25 rpm, it is composed only of the non-conductive erasable part shown in FIG. 5 (e). A rectangular parallelepiped eraser sample (C4) (thickness: 11 mm, width: 21 mm, length: 50.0 mm) was obtained. In this eraser sample (C4), only the non-conductive eraser portions were exposed on both the short side surfaces and the bottom surface.

(Operability of a sample eraser smartphone with various sleeves attached)
Each of the eraser samples (E2) to (E4) obtained in Examples 2 to 4 was housed in a paper sleeve (thickness: 0.25 mm) used for commercially available erasers. Each eraser sample and the inner wall of the sleeve were in close contact with each other.

In this state, the two short sides of each sleeve are gripped with the thumb and index finger, the bottom surface of the samples (E2) to (E4) is pressed against the display of the smartphone, and the samples (E2) to (E4) are slid. ), we confirmed the operability of the smartphone on the display. In addition, the operability when the sleeve was not attached was also confirmed. Table 2 shows the results.

Next, instead of the paper sleeve, a sleeve (conductive paper sleeve) made using paper (thickness: 0.25 mm) having a volume resistivity of 3.0 × 10 ⁵ Ω cm, and aluminum ( The operability of the smartphone on the display accompanying the movement of the samples (E2) to (E4) was confirmed using sleeves (aluminum sleeves) prepared using a thickness of 0.4 mm. In addition, the operability when the sleeve was not attached was also confirmed. Table 2 shows the results.

Furthermore, the eraser samples (C3) and (C4) obtained in Comparative Examples 3 and 4 were housed in paper sleeves, conductive paper sleeves, and aluminum sleeves in the same manner as above. Then, the two short sides of these sleeves were pinched with the thumb and forefinger and pressed against the smartphone display to confirm the operability of the smartphone on the display accompanying the movement of the samples (C3) and (C4). In addition, the operability when the sleeve was not attached was also confirmed. Table 2 shows the results.

As shown in Table 2, when all of the eraser samples (E2) to (E4) obtained in Examples 2 to 4 were housed in a conductive sleeve (made of conductive paper or aluminum), The operability of the smartphone was as good as when it was not housed in the sleeve. In addition, with the thickness adopted in this example, the smart phone could be operated satisfactorily even with a paper sleeve.

100, 300 Eraser 102a, 102b Bottom 104 Side 104a, 104b, 104c, 104d Rectangular surface 110 Conductive eraser portion 120 Non-conductive eraser portion 212 Thumb 214 Index finger 216 Middle finger 340 Conductive sleeve

Claims (6)

A continuously extending conductive eraser portion and a non-conductive eraser portion arranged side by side with the conductive eraser portion,
An eraser wherein both a portion of the conductive eraser portion and a portion of the non-conductive eraser portion are exposed on the same side. Consists of two bottom surfaces and side surfaces disposed between the two bottom surfaces,
Both a part of the conductive erasable part and a part of the non-conductive erasable part are exposed on the bottom surface, and a part of the electrically conductive erasable part is exposed on the side surface. 2. The eraser of claim 1, wherein the eraser is a. 3. The eraser of claim 2, wherein a portion of said conductive eraser portion is exposed at the center of said bottom surface. 4. The eraser according to claim 2 or 3, wherein the intersection of said bottom surface and said side surface consists of a portion of said non-conductive eraser portion. 5. The eraser according to any one of claims 1 to 4, wherein the outermost conductive sleeve is arranged. 6. The eraser of any of claims 1-5, wherein the electrically conductive eraser portion contains a carbon source.

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