JPH05156187A - Solid eraser - Google Patents

Abstract

(57) [Summary] [Constitution] 40-90% by weight of a white pigment such as titanium oxide,
A compound containing at least 10 to 60% by weight of a 2-block copolymer of a styrene-based thermoplastic elastomer such as a styrene-ethylene butylene 2-block copolymer or a styrene-ethylene propylene 2-block copolymer. [Effect] At the time of application, a good coating can be obtained, and a high-strength coating that does not flow even when rubbed with fingers is obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a handwriting of a water-based ink such as a fountain pen, a water-based felt-tip pen, a water-based ballpoint pen, a handwriting of an oil-based ink such as an oil-based ballpoint pen and an oil-based felt-tip pen, and printing on a typewriter or printer, and concealment correction of other printed matter. The present invention relates to a solid correction tool for performing.

[0002]

2. Description of the Related Art Conventionally, a white pigment, a binder resin, and a volatile solvent as a dispersion medium for dispersing the white pigment have been used as a main component for concealing and correcting the handwriting of water-based inks and oil-based inks and various printed images. There is a correction fluid to In order to correct the concealment using this correction liquid, the correction liquid was applied to the correction spot, and after this coating film was completely dried, rewriting was performed on the coating film with a writing instrument or the like.

However, when such a correction liquid is used, a waiting time of ten to several tens of seconds is required from the application of the correction liquid to the complete drying of the coating film, so that the rewriting is necessary. Was lacking in speed. This waiting time is the time required for the solvent to evaporate. Therefore, it is considered that a solvent having high volatility may be used to shorten the waiting time. Nevertheless, virtually eliminating this waiting time is essentially impossible with the use of solvents.

Therefore, in order to eliminate the waiting time, it is not necessary to use a solvent, but in that case, the dispersion medium for dispersing the white pigment must be a solid substance which can be coated at room temperature. As such a base material that is solid at room temperature and can be applied, there are waxes generally used for crayons and the like.

[0005]

However, when a white pigment is simply dispersed in waxes, the coating film after coating easily flows by rubbing with fingers and the like, and therefore the original purpose of concealment is concealed. Not only will it not be possible to make the correction, but it will also cause another problem that the area near the coated area will become dirty.

[0006]

DISCLOSURE OF THE INVENTION The gist of the present invention is a solid correction tool containing at least a white pigment and a diblock copolymer of a styrene thermoplastic elastomer.

The present invention will be described in detail below. White pigments are used to hide handwriting and images, and zinc oxide,
There are barium sulfate, calcium carbonate, titanium oxide and the like, but titanium oxide is most preferable from the viewpoint of hiding power. Titanium oxide can be used in both rutile type and anatase type. These white pigments may be used singly or in combination of two or more kinds, and the use amount varies depending on the kind of the white pigment, but it is preferably 40 to 90% by weight based on the total amount of the solid correction tool in view of the hiding power for handwriting. . If the amount of the white pigment used is less than 40% by weight, the hiding power becomes insufficient and the corrected handwriting or image may be seen through. 90% by weight
This is because if it exceeds, it becomes impossible to form a coating film when applied to paper or the like.

The styrene-based thermoplastic elastomer two-block copolymer is composed of a polystyrene block and a rubber component block. There are styrene-ethylene butylene 2-block copolymers in which the rubber component is ethylene butylene and styrene-ethylene propylene 2-block copolymers in which ethylene propylene is used. Specifically, Kraton G1726X (manufactured by Shell Chemical Co., Ltd.) or styrene-ethylene propylene 2-block consisting of 70% styrene-ethylene-butylene 2-block copolymer and 30% styrene-ethylene-butylene-styrene 3-block copolymer. Clayton G1701X (manufactured by Shell Chemical Co., Ltd.), Septon 1001, and 1050 (the above, which are copolymers)
Manufactured by Kuraray Co., Ltd.

2 of the above-mentioned styrene-based thermoplastic elastomers
The block copolymers can be used alone or as a mixture of two or more kinds, and the amount thereof is preferably 10 to 60% by weight based on the total amount of the solid correction tool.

In the present invention, in addition to the above components, a filler, a coloring agent such as a colored pigment, a liquid rubber, a mineral oil, an oil and fat, beeswax, an animal wax such as white wax, a candelilla wax, and carnauba. Natural waxes such as waxes, plant waxes such as wood wax, montan wax, mineral waxes such as ozokerite, paraffin wax, petroleum waxes such as microcrystalline wax, Fischer-Tropsch wax, low molecular weight polyethylene and their derivatives, montan wax, paraffin Waxes, derivatives of microcrystalline wax, synthetic waxes such as cetyl alcohol, stearic acid, polyethylene glycol stearate, and castor wax can also be used. Further, as a handwriting drying time shortening agent in the case of rewriting with an aqueous ink, a super absorbent polymer such as starch, polyacrylate, acrylic acid / vinyl alcohol copolymer, sodium polyacrylate, guar gum, locust bean, etc. Of course, it can be used in combination with a water-thickening gelling polymer substance such as gum, quince seed gum, carrageenan, alginic acid, gum arabic, gelatin, and polyvinylpyrrolidone.

In order to obtain the present solid correction tool, each of the above components may be mixed and dispersed by a conventionally known mixer for plastic or rubber, and molded by a molding machine.

[0012]

The two-block copolymer of the styrene thermoplastic elastomer which is the base material in the present invention does not form a perfect three-dimensional network structure like the three-block copolymer. Therefore, the styrene-based thermoplastic elastomer two-block copolymer is itself a material having wear resistance and disintegration. Moreover, by kneading with a large amount of white pigment, wear resistance and disintegration become more remarkable. Therefore, it can be applied to paper, and when it is used as a base material of a solid correction tool, it can be applied as a concealing correction tool for handwriting and images, and even when the coating film is rubbed, the coating film does not flow.

[0013]

The present invention will be described in more detail based on the following examples, but "part" in the examples and comparative examples means "part by weight". Example 1 Clayton G1701X 32 parts Titanium oxide (Kronos KR-380, manufactured by Titanium Industry Co., Ltd.) 60 parts Liquid polybutene (manufactured by Nippon Petrochemical Industry Co., Ltd.) 2 parts Silicon oxide (Mizukasil P-801, Mizusawa Chemical Industry ( Co., Ltd.) 6 parts The above components were mixed and dispersed with a two roll heated to 80 ° C., poured into a mold and cooled to obtain a solid correction tool.

Example 2 Septon 1001 25 parts Titanium oxide (Taitone R-650, manufactured by Sakai Chemical Industry Co., Ltd.) 50 parts 130 ° F paraffin wax 10 parts Heavy calcium carbonate 15 parts The same components as in Example 1 were used. I got a solid correction tool.

Example 3 Septon 1050 20 parts Clayton G1726X 5 parts Titanium oxide 50 parts 130 ° F paraffin wax 10 parts Heavy calcium carbonate 14 parts Sunwet IM-1000MPS (super absorbent polymer, Sanyo Kasei Co., Ltd.) Manufacture) 1 part A solid correction tool was obtained in the same manner as in Example 1 except that the above components were used.

Comparative Example 1 130 ° F paraffin wax 28 parts Titanium oxide (Titone R-650, manufactured by Sakai Chemical Industry Co., Ltd.) 60 parts White petrolatum 6 parts Silicon oxide (Mizukasil P-801, manufactured by Mizusawa Chemical Industry Co., Ltd.) ) 6 parts A solid correction tool was obtained in the same manner as in Example 1.

[0017]

[Effects of the Invention] The solid correction tools obtained in Examples 1 to 3 and Comparative Example 1 were applied to a paper surface, and the coating film thus formed was strongly rubbed with a finger. The coating film flowed and spread to the vicinity of the area other than the coating area, but in Examples 1 to 3, the flow of the coating film did not occur and the vicinity of the coating area was not contaminated. The obtained coating films all showed high hiding power. As described above, the solid correction tool according to the present invention takes advantage of the advantages of a solid, and is excellent in various properties of the coating film after being applied as the correction tool.

Claims (1)

[Claims] 1. A solid correction tool containing at least a white pigment and a two-block copolymer of a styrene-based thermoplastic elastomer.