JPH10151897A - Eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously eliminate industrial waste countermeasure and recycling use of shell generated in a large quantity by forming an eraser by incorporating comminuted shell therein. SOLUTION: In the eraser using regenerated vinyl chloride resin in the vinyl chloride resin or part or entirety of the vinyl chloride resin as a base material, comminuted shell is contained therein instead of an inorganic filler or abrasives such as calcium carbonate, chalk, kaolin. Content of the comminuted shell is 55wt.% or less. As the shell, at least one type selected from scallop, pearl oyster, short-neck clam, clam and oyster is used. These shell are comminuted as comminuted shell. Grain size of the comminuted shell is preferably regulated to about 0.1 to 300μm and contained in the eraser.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to erasers containing crushed shells, and more particularly to erasers containing crushed shells for the purpose of industrial waste countermeasures and recycling.

[0002]

2. Description of the Related Art Conventionally, oysters, scallops, oysters, clams, clams and the like have been widely cultivated. By the way, in the cultivation of these shellfish, since shells are produced in large quantities as industrial waste, effective use thereof is a major issue. Until now, effective use of soil improvement materials,
In addition to being used as chicken feed, sea bottom improving material, etc., it has recently been considered to be used as an anti-slip agent on frozen road surfaces (anti-slip agent), but further expansion is desired.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a character eraser containing a crushed material of a shell as a filler from the viewpoint of measures against shell waste and recycling. .

[0004]

That is, the present invention includes an eraser characterized by containing ground shells (Section 1). Further, in the above item 1, the eraser whose content of the crushed shell is 55% by weight or less (item 2), and in the above item 1 or 2, the shell is scallop, Akoya,
Eraser consisting of at least one kind of shells selected from clams, clams and oysters (item 3);
In the second or third section, the eraser using a vinyl chloride resin as the base material (Section 4).
The eraser using recycled vinyl chloride resin (Section 5) shall be the contents.

[0005] The shell used in the present invention is not particularly limited, but scallops, oysters, clams, clams, oysters and the like are preferred, and these can be used alone or in combination of two or more.

[0006] These shells are pulverized into pulverized products.
The pulverization method is not particularly limited, and a known pulverizer such as a pulverization method by compression, a pulverization method by a George Crusher, and a stone-type pulverizer may be used. The particle size of the pulverized product is preferably in the range of about 0.1 to 300 μm.

The pulverized shells used in the present invention are mainly used as substitutes for inorganic fillers such as calcium carbonate, chalk, kaolin, etc., abrasives, etc. among the materials constituting the eraser. %, Preferably in the range of 5 to 55% by weight. When used as a substitute for an abrasive, it is desirable to form the shape having sharp corners by a compression pulverization method, a George Crusher pulverization method, or the like, and to make the particle size slightly coarse. Of course, if necessary,
The pulverized shell of the present invention can be used in combination with a conventional inorganic filler or abrasive.

The crushed shell of the present invention can be applied to any type of eraser, such as ordinary eraser, eraser with sand, and dual-purpose eraser. Eraser (based on rubber), plastic character Eraser (based on vinyl chloride resin etc.),
It can be applied to oil-based character erasing (soap character erasing) and character erasing using a thermoplastic elastomer.

As the vinyl chloride resin as the base material for the plastic eraser, a vinyl chloride resin obtained by reclaiming a vinyl chloride film for waste agriculture or the like can be used for a part or the whole thereof. In this case, both the eraser base material and the filler will be reused, and the object of the present invention of industrial waste measures and recycling is more effectively achieved.

[0010]

Hereinafter, the present invention will be described in more detail with reference to examples, but it is needless to say that the present invention is not limited to such examples. In the following description, “parts” means “parts by weight” unless otherwise specified.

Example 1 Erasers (normal erasers and sand-containing erasers) were prepared according to the formulations shown in Table 1. The eraser obtained was almost equivalent to the eraser obtained by replacing the ground shell with calcium carbonate in the formulation shown in Table 1.

[0012]

[Table 1]

[0013] Natural rubber: RSS1 grade (produced in Indonesia) Sub: white sub # 1 (manufactured by Tenma Sub Chemical Industries, Ltd.) Softener: Diana Process NP-24 (manufactured by Idemitsu Kosan Co., Ltd.) Zinc oxide: zinc oxide (Sakai Chemical Industry Titanium: JA-3 (manufactured by Teica Co., Ltd.) Crushed shell (A): Crushed scallops (grain size 4 to 40 μm) 〃 (B): 〃 (used as abrasive) (grain size 100 to 200 μm) Sulfur: Powdered sulfur (Karuizawa Refinery) Vulcanization accelerator: Noxeller DM (Ouchi Shinko Chemical Co., Ltd.) Abrasive: Hi-Silica H (Nichetz)

Example 2 A eraser using a thermoplastic elastomer was prepared according to the composition shown in Table 2. The obtained eraser was almost the same as the eraser obtained by replacing the ground shell with chalk in the formulation of Table 2.

[0015]

[Table 2]

Example 3 Plastic erasers were prepared according to the formulations shown in Table 3. The obtained eraser was almost the same as the eraser obtained by replacing the ground shell with calcium carbonate in the formulation shown in Table 3.

[0017]

[Table 3]

Example 4 As shown in Table 4, in Example 3 above, PVC 100
A plastic eraser was made in the same manner except that 30 parts of the parts were replaced with PVC made from recycled agricultural waste vinyl chloride film. The eraser obtained was almost equivalent to that obtained in Example 3.

[0019]

[Table 4]

[0020]

As described above, according to the present invention, measures against industrial waste and recycling of shells generated in large quantities are achieved at once, and their industrial utility is extremely large.

Claims (5)

[Claims] 1. A character eraser characterized by containing ground shells. 2. The eraser according to claim 1, wherein the content of the ground shell is 55% by weight or less. 3. The eraser according to claim 1, wherein the shell comprises at least one kind of shell selected from scallops, oysters, clams, clams and oysters. 4. The eraser according to claim 1, wherein a vinyl chloride resin is used as the base material. 5. The eraser according to claim 4, wherein a recycled vinyl chloride resin is used for part or all of the vinyl chloride resin as the base material.