JP2003112499A - Letter eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a letter eraser bringing about a light feeling of erasure, without lowering a rate of erasure of the letter. SOLUTION: The letter eraser contains a silicone oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to erasing, and more particularly to erasing which has a small friction resistance with a paper surface when a handwriting is erased by erasing, that is, an erasing feeling is light.

[0002]

2. Description of the Related Art The mechanism of erasing by erasing is such that the erasing is closely rubbed against the handwriting on the paper, the handwriting is adsorbed to the erasing, and the surface part of the erasing that adsorbs the handwriting is erased as erasure. It is possible to remove the eraser and renew the eraser surface so that the handwriting can be absorbed again.

Thus, when the frictional resistance when the eraser is in close contact with the handwriting on the paper surface and the frictional resistance is large, the erased feeling becomes heavy. Therefore, a material having a small frictional resistance and a light erased feeling is required.

However, in reality, there have been almost no attempts to reduce the erase feeling when erasing characters. Especially in recent years, from the viewpoint of environmental protection, eraser base material is
There is a tendency to migrate from vinyl chloride resin to styrene resin, olefin resin, ethylene-vinyl acetate resin, rubber, etc. When trying to lighten, the erasure rate tended to decrease.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention provides an eraser which reduces the erase rate without reducing the erase rate.

[0006]

As a result of intensive research to solve the above problems, the present inventors have found that the inclusion of silicone oil can reduce the erasing feeling without lowering the erasing rate. The invention was reached.

That is, claim 1 of the present invention is an eraser characterized by containing silicone oil.

A second aspect of the present invention is the eraser according to the first aspect, wherein the base material is a styrene resin.

According to claim 3 of the present invention, a styrene resin 10
The eraser according to claim 2, wherein the silicone oil is 2 to 20 parts by weight with respect to 0 parts by weight.

According to claim 4 of the present invention, the eraser according to claim 2 or 3, wherein the silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil and epoxy modified silicone oil. Is.

A fifth aspect of the present invention is the eraser according to the first aspect, wherein the base material is an olefin resin.

[0012] Claim 6 of the present invention is an olefin resin 1
The eraser according to claim 5, wherein the silicone oil is 2 to 20 parts by weight with respect to 00 parts by weight.

According to a seventh aspect of the present invention, the silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, and epoxy modified silicone oil. The eraser according to claim 5 or 6.

An eighth aspect of the present invention is the eraser according to the first aspect, wherein the base material is an ethylene-vinyl acetate resin.

According to a ninth aspect of the present invention, the silicone oil is contained in an amount of 3 to 100 parts by weight of the ethylene-vinyl acetate resin.
The eraser according to claim 8, which is 35 parts by weight.

A tenth aspect of the present invention is the eraser according to the eighth or ninth aspect, wherein the silicone oil is dimethyl silicone oil and / or epoxy-modified silicone oil.

The eleventh aspect of the present invention is the eraser according to the first aspect, wherein the base material is rubber.

A twelfth aspect of the present invention is the eraser according to the eleventh aspect, wherein the silicone oil is 8 to 80 parts by weight with respect to 100 parts by weight of the rubber.

In a thirteenth aspect of the present invention, the silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, and epoxy modified silicone oil. The eraser according to claim 11 or 12.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The base material used in the present invention is preferably a styrene-based, olefin-based, ethylene-vinyl acetate-based or rubber-based base material, and these may be used alone or in combination of two or more as required. However, styrene-based, olefin-based, and rubber-based substrates are particularly suitable.

Examples of the styrene base material include styrene-isoprene-styrene copolymer, styrene-ethylene butylene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene propylene-.
Examples thereof include styrene-based thermoplastic elastomers such as styrene copolymers and styrene-based thermoplastic elastomer compounds. These may be used alone, but are preferably used in combination of two or more kinds. Further, it may be combined with other base materials without any problem.

Examples of the olefin base material include Sumitomo TPE (Sumitomo Chemical Co., Ltd.), Mirastomer (Mitsui Chemicals, Inc.), ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-α olefin. Olefin-based elastomers such as copolymers (metallocene catalysts), amorphous poly-α-olefins, high-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, polypropylene and the like can be mentioned. These may be used alone, but preferably two or more kinds. Used in combination. Further, it may be combined with other base materials without any problem.

Examples of the ethylene-vinyl acetate base material include Evaflex (trade name, Mitsui DuPont Polychemical Co., Ltd.) and Ultrasen (Tosoh Co., Ltd.), which may be used alone, but are preferably used. Used in combination of two or more. Further, it may be combined with other base materials without any problem.

Examples of the rubber base material include IIR (butyl rubber), IR (isoprene rubber), SBR (styrene-butadiene rubber), BR (butadiene rubber), EP.
Examples thereof include M (ethylene propylene rubber), EPDM (ethylene propylene terpolymer), acrylic rubber, polyisobutylene, and NR (natural rubber). These may be used alone, but preferably two or more kinds are used in combination.
Further, it may be combined with other base materials without any problem.

Examples of the silicone oil used in the present invention include methylhydrogen silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, dimethyl silicone oil, fluorine modified silicone oil. , Epoxy modified silicone oil, epoxy polyether modified silicone oil, alkylaralkyl modified silicone oil and the like, and these may be used alone or in combination of two or more as required.

In the case of a styrene base material, dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, epoxy modified silicone oil and the like are preferable, and the preferable content of these is 2 with respect to 100 parts by weight of styrene resin. ~ 20 parts by weight.
Considering the erasability, the more preferable content is 3 to 10 parts by weight with respect to 100 parts by weight of the styrene resin.

In the case of an olefin base material, dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, epoxy modified silicone oil, etc. are preferable, and their preferable contents are It is 2 to 20 parts by weight with respect to 100 parts by weight of the olefin resin. Considering the erasability, the more preferable content is 3 to 10 parts by weight with respect to 100 parts by weight of the olefin resin.

In the case of the ethylene-vinyl acetate base material, dimethyl silicone oil and epoxy-modified silicone oil are preferable, and the content thereof is 3 to 35 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate resin. Considering the erasability, the more preferable content is 5 to 17 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate resin.

In the case of a rubber base material, dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, epoxy modified silicone oil and the like are preferable, and their preferable contents are It is 8 to 80 parts by weight with respect to 100 parts by weight of rubber. A more preferable content in consideration of erasability is 12 to 40 parts by weight with respect to 100 parts by weight of rubber.

Further, if necessary, fillers such as heavy calcium carbonate, light calcium carbonate, silica, diatomaceous earth, magnesium oxide, talc, sericite, quartz powder, montmorillonite, scallops, oysters, shell powders such as wrinkles, etc., Organic hollow particles, inorganic hollow particles and organic / inorganic pigments,
Colorants such as dyes, fragrances, stabilizers, lubricants, antioxidants,
Other additives such as an ultraviolet absorber and an antifungal agent can also be optionally used. Further, by adding a microcapsule containing a solvent capable of dissolving ink or the like, or an abrasive for abrading ink handwriting, it is possible to provide an erasable eraser other than the pencil handwriting.

The eraser composition comprising the above components is
It is kneaded, molded by press molding, injection molding, extrusion molding, etc., and cut into a predetermined size to obtain a product.

[0032]

The present invention will be described in more detail based on the following examples and comparative examples, but these do not limit the scope of the present invention.

The materials used in the following examples and comparative examples are shown in Table 1. In the following description, "part" means "part by weight" unless otherwise specified.

[0034]

[Table 1]

Examples 1 to 16 and Comparative Examples 1 to 4 As shown in Table 2, styrene-based, olefin-based, ethylene-vinyl acetate-based and rubber-based substrates were used, and dimethyl silicone oil " SH-2
A resin composition using "00 (molecular weight 10,000)" was kneaded and mixed, and then a sample was obtained by extrusion molding with a mold having a predetermined size. In the case of a rubber base material, a sample was obtained after the vulcanization operation. The erasure rate and erase feeling of each sample were measured and evaluated by the following methods.

Method of measuring erasure rate (JIS-S-6050
(1) A test piece was prepared by cutting a sample into a plate having a thickness of 5 m / m and finishing the contact portion with the test paper into an arc having a radius of 6 m / m. (2) The test piece is brought into contact with the colored paper perpendicularly and at right angles to the colored line, and a weight is placed on the test piece so that the total weight of the weight and the holder becomes 0.5 kg.
The colored part was abraded 4 times at a speed of 150 ± 10 cm / min. (3) Densitometer (DENSITOMETER PDA65
(manufactured by Sakura Inc.), the density of the non-colored portion of the colored paper was set to 0, and the densities of the colored portion and the abrasion portion were measured. (4) The erasure rate was calculated by the following formula. Deletion rate (%) = (1- (density of wear part / density of colored part)) × 100

Erasure: Five panelists evaluated the frictional resistance when the handwriting was erased using the sample on a scale of 5 (5 to 1 in the direction from "heavy" to "light"), The total points are shown. The results are shown in Tables 2-5.

[0038]

[Table 2]

[0039]

[Table 3]

[0040]

[Table 4]

[0041]

[Table 5]

Examples 17 to 32 As the silicone oil, dimethyl silicone oil "SH-200 (molecular weight 100, 100) having different molecular weights was used.
0, 10,000, 1,000,000) ”was used and samples were obtained in the same manner as in Examples 1 to 16 to measure the characteristics.
evaluated. The erasing sensation was evaluated as "heavy" or "light" based on Comparative Examples 1 to 4 in which the silicone oil was not added. The results are shown in Tables 6-9.

[0043]

[Table 6]

[0044]

[Table 7]

[0045]

[Table 8]

[0046]

[Table 9]

Examples 33 to 40 Samples were obtained in the same manner as in Examples 17 to 32 while changing the type of silicone oil, and the characteristics were measured and evaluated. The results are shown in Table 1.
It shows in 0.

[0048]

[Table 10]

As can be seen from Table 10, even if the kind of silicone oil is changed, the erase feeling is light and good eraser can be obtained. It should be noted that substantially the same result can be obtained even when the base material is changed from styrene resin to olefin resin, ethylene-vinyl acetate resin, or rubber.

[0050]

As described above, according to the present invention, it is possible to provide a good eraser with a light erase feeling without reducing the erase rate.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C08L 83/04 C08L 83/04 (72) Inventor Hiromi Masutomi Uchishiro-cho, Miyakojima-ku, Osaka-shi, Osaka 3-5-25 Seed Rubber Industry Co., Ltd. F term (reference) 4J002 AC011 AC061 AC081 BB031 BB061 BB121 BB141 BB151 BB181 BG031 CP032 CP042 CP082 CP092 CP182

Claims (13)

[Claims] 1. An eraser comprising a silicone oil. 2. The eraser according to claim 1, wherein the base material is a styrene resin. 3. The eraser according to claim 2, wherein the silicone oil is 2 to 20 parts by weight with respect to 100 parts by weight of the styrene resin. 4. The eraser according to claim 2, wherein the silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, and epoxy modified silicone oil. 5. The base material is an olefin resin as claimed in claim 1.
Erasing the listed characters. 6. With respect to 100 parts by weight of the olefin resin,
The eraser according to claim 5, wherein the silicone oil is 2 to 20 parts by weight. 7. The silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, and epoxy modified silicone oil. Erasing the listed characters. 8. The eraser according to claim 1, wherein the base material is an ethylene-vinyl acetate resin. 9. The eraser according to claim 8, wherein the silicone oil is 3 to 35 parts by weight with respect to 100 parts by weight of the ethylene-vinyl acetate resin. 10. The eraser according to claim 8 or 9, wherein the silicone oil is dimethyl silicone oil and / or epoxy-modified silicone oil. 11. The eraser according to claim 1, wherein the base material is rubber. 12. The eraser according to claim 11, wherein the silicone oil is 8 to 80 parts by weight with respect to 100 parts by weight of the rubber. 13. The silicone oil is at least one selected from dimethyl silicone oil, methylphenyl silicone oil, polyether modified silicone oil, amino modified silicone oil, carboxy modified silicone oil, and epoxy modified silicone oil. Erasing the listed characters.