JPH05209144A - Masking composition - Google Patents

Abstract

PURPOSE:To provide the subject composition composed of a masking material, a binder and a water-absorbing polymer, free from ink-repelling trouble, having excellent driability, rewritability and masking power and suitable for correction sheet, etc. CONSTITUTION:The objective composition is composed of (A) preferably 40-80wt.% of a masking material such as titanium oxide, (B) preferably 10-60wt.% of a binder such as an acrylic resin or alkyd resin and (C) preferably 0.5-20wt.% of a water-absorbing polymer such as acrylic acid-vinyl alcohol copolymer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a correction sheet (tape).
The present invention relates to a concealing composition used in.

[0002]

2. Description of the Related Art Conventionally, a correction liquid and a correction sheet (tape) have been known as those for concealing correction of characters, patterns and the like. In particular, the correction sheet (tape) has the advantages that it does not require a waiting time until rewriting after concealing compared with the correction liquid, and that correction can be performed in a short time. Here, as a correction sheet (tape), the hiding composition is applied in a liquid form using a solvent or is applied to a release paper (release tape) in a liquid form by heating, and after drying or cooling, the hiding composition layer The thing which applied the adhesive on the surface can be illustrated. The hiding composition used as such a correction sheet (tape) and used as a hiding transfer coating (hereinafter, simply referred to as a coating film) mainly contains a hiding material and a binder.

As the hiding material, a pigment having a high hiding property such as titanium oxide is used.

As the binder, specifically, a resin material such as an acrylic resin, a vinyl alkyl ether resin, a cyclized rubber, a styrene-butadiene copolymer elastomer, or a wax material such as paraffin wax or carnauba wax is used. Was there.

[0005]

PROBLEM TO BE SOLVED BY THE INVENTION Correction sheet (tape)
In addition to hiding characters and patterns, in many cases rewriting is done on the coating film after correction, so there is little decrease in the character density of the rewriting handwriting, and the rewriting handwriting may dry quickly. preferable. However, the concealing composition using a resin-based material or a wax-based material for the binder, since the coating film itself is hydrophobic, there is no problem in the case of oil-based ink, fountain pen using water-based ink, In the case of a felt-tip pen or the like, the ink is repelled and rewriting is difficult, or even if rewriting is possible, there is a problem that the handwriting is slow to dry.

The present invention has been made in order to improve the rewriting property or the rewriting drying property of a coating film, and is a hiding composition comprising at least a hiding agent, a binder, and a water-absorbing polymer. Things are the gist.

The details will be described below. As the hiding material, a pigment having a high hiding property such as titanium oxide or zinc oxide is used. Titanium oxide is particularly preferable. As titanium oxide, various titanium oxides such as rutile type and anatase type can be used. Commercially available products are Tytone SR-1 and R
-650, R-3L, A-110, A-150,
The same R-5N (above, Sakai Chemical Industry Co., Ltd.), Taipaque R-580, the same R-550, the same R-930, the same A-10.
0, A-220, CR-58 (all manufactured by Ishihara Sangyo Co., Ltd.), Kronos KR-310-310, and KR-.
380, KR-480, KA-10, KA-2
0, the same KA-30 (above, manufactured by Titanium Industry Co., Ltd.), TYPURE R-900, the same R-931 (above, manufactured by DuPont Japan Co., Ltd.) and the like. The amount used is preferably 40 to 80% by weight based on the total amount of the concealing composition.

The binder is used by the hiding composition to form a good coating. Specific examples include resin-based substances such as acrylic resin, alkyd resin, vinyl resin, polyester resin, vinyl alkyl ether resin, cyclized rubber, and styrene-butadiene elastomer, and animal-based substances such as beeswax, spermaceti and insect white wax. Plant waxes such as wax, candelilla wax, carnauba wax, and wood wax,
Mineral wax such as montan wax and ozokerite,
Examples include wax-based substances such as petroleum-based waxes such as paraffin wax and microcrystalline wax. The amount used is 10 to 60 relative to the total amount of the concealing composition.
Weight percent is preferred. The above-mentioned binder is produced under the conditions (for example, when it is liquefied by using a solvent, a resin-based substance soluble in the solvent used is used, or when it is liquefied by heating, it is wax-based. It is selected as appropriate based on the quality required for products and the use of many substances).

The water-absorbent polymer, which is a feature of the present invention, absorbs ink during rewriting with water-based ink,
It is used to prevent repellency and improve the dryness of rewriting, starch-acrylic acid graft copolymer,
Examples include acrylic acid-vinyl alcohol copolymers, acrylic acid copolymers, and polyacrylate salts. A specific example will be described below.

As a starch-acrylic acid graft copolymer, Sunwet IM-300MPS (central particle size 10
0-840 μm), IM-1000 MPS (center particle size 20-50 μm), IM-1000 (center particle size 100)
~ 840 μm), the same IM-2300 (central particle size 100 ~
840 μm) (above, Sanyo Chemical Industry Co., Ltd.) and the like.

As the acrylic acid-vinyl alcohol copolymer, Sumikagel SP-510 (average particle size 10 to 20 μm)
m), the same SP-520 (average particle size 20 to 40 μm) (above, manufactured by Sumitomo Chemical Co., Ltd.) and the like.

As an acrylic acid polymer, Arassorb S-
100 (average particle size 200 to 400 μm), 750 (average particle size 150 to 300 μm), 751 (average particle size 15)
0 to 300 μm), 800 F (average particle size 30 to 50 μm)
m), 800 A (average particle size 150 to 300 μm) (above, manufactured by Arakawa Chemical Industry Co., Ltd.) and the like.

As a polyacrylic acid salt, Sunwet I
M-5000 (central particle size 100-840 μm), IM
-5000 MPS (central particle size 20-50 μm) (above,
Sanyo Kasei Kogyo Co., Ltd. etc. are mentioned.

The above water-absorbing polymers can be used alone or in a mixture, and the amount thereof is preferably 0.1 to 30% by weight, more preferably 0.1% by weight, based on the entire hiding composition.
It is 5 to 20% by weight.

The particle size of the water-absorbent polymer is preferably 50 μm or less in consideration of the smoothness of the coating film.

It should be noted that colored pigments are used to match the color tone with the paper to be masked (for example, postcards, colored papers, etc.), extenders such as silica and calcium carbonate are used to deluster the coating, and coatings are hardened. It is also possible to appropriately add various additives such as a plasticizer for adjusting the thickness and a dispersant for dispersing the pigment.

[0017]

In the concealing composition according to the present invention, the water-absorbing polymer contained therein is present on the surface of the modified coating film and in the vicinity of the surface thereof. On the surface of the coating film and in the vicinity of the surface, resulting in gelation. Therefore, it is presumed that the handwriting is dried quickly and repellency is suppressed as much as possible.

[0018]

EXAMPLES Hereinafter, simply referring to "parts" means "parts by weight".

Example 1 Chronor KR-380 65 parts Acryloid B-66 (acrylic resin made by Rohm & Haas Company, USA) 25 parts Methylcyclohexane 120 parts Sumikagel SP-510 18 parts Homogenol L-18 (Kao Soap Co., Ltd.) , Dispersant) 1.2 parts The above components were dispersed in a ball mill for 24 hours to obtain a hiding composition (solvent-soluble type).

Example 2 Chronos KR-380 60 parts Acryloid B-66 13 parts 1,1,1-trichloroethane 100 parts Sunwet IM-1000MPS 15 parts Homogenol L-18 1.2 parts The above components were combined with Example 1 In the same manner, a masking composition (solvent-soluble type) was obtained.

Example 3 Chronos KR-380 60 parts Acryloid B-66 12 parts Methylcyclohexane 100 parts Arassorb 800F 15 parts Homogenol L-18 1.2 parts The same components as in Example 1 were used for the concealing composition. (Solvent-soluble type) was obtained.

Example 4 Taipaque CR-58 60 parts 130 ° F paraffin wax 13 parts Sumikagel SP-510 15 parts The above components were mixed and dispersed with a two-roll roller heated to 80 ° C. to form a concealing composition (heat melting type). ) Got.

Example 5 Chronos KR-380 60 parts Carnauba wax 12 parts Sunwet IM-5000MPS 15 parts The above components were treated in the same manner as in Example 4 to obtain a concealing composition (heat melting type).

Example 6 Chronos KR-380 60 parts Candelilla wax 15 parts Alassorb 800F 10 parts The above components were treated in the same manner as in Example 4 to obtain a concealing composition (heat melting type).

Comparative Example 1 A concealing composition (solvent-soluble type) was obtained in the same manner as in Example 1 except that Sumikagel SP-510 of Example 1 was omitted.

Comparative Example 2 A concealing composition (solvent-soluble type) was obtained in the same manner as in Example 2 except that the sun wet IM-1000MPS of Example 2 was omitted.

Comparative Example 3 Example 3 except that the Arasorb 800F of Example 3 was omitted.
A concealing composition (solvent-soluble type) was obtained in the same manner as in.

Comparative Example 4 A concealing composition (heat-melting type) was obtained in the same manner as in Example 4 except that Sumikagel SP-510 of Example 4 was omitted.

Comparative Example 5 A concealing composition (heat melting type) was obtained in the same manner as in Example 5 except that the sun wet IM-5000MPS of Example 5 was omitted.

Comparative Example 6 Example 6 except that the Arasorb 800F of Example 6 was omitted.
In the same manner as described above, a concealing composition (heat melting type) was obtained.

The concealing compositions obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were coated on a release paper with a 76 μm applicator, dried, and then SK Dyne E-3008BC.
(Emulsion type adhesive manufactured by Soken Chemical Co., Ltd.) was applied and dried to obtain a correction sheet. The concealing compositions obtained in Examples 4 to 6 and Comparative Examples 4 to 6 were heated to 80 ° C. to be melted, coated on a release paper with a 76 μm applicator, and after cooling, SK Dyne E- Apply 3008BC,
It dried and the correction sheet was obtained.

Using the correction sheet obtained above, rewriting performance test and handwriting dryness test were conducted. Table 1 shows the test results of the correction sheets according to Examples 1 to 3 and Comparative Examples 1 to 3, and Table 2 shows the test results of the correction sheets according to Examples 4 to 6 and Comparative Examples 4 to 6.

Rewriting ability test: On the coating film at the corrected portion, writing was performed with a writing instrument using a water-based ink (Ball Pentel B-100, manufactured by Pentel Co., Ltd.), and the state of handwriting was observed. ○: There is no repellency in the handwriting ×: There is repellency in the handwriting ・ Handwriting dryness test: Write with the writing instrument using the above water-based ink on the coating film at the corrected portion, and after writing, rub the writing portion with your finger. The time until the ink does not adhere to the finger was measured.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

As described above in detail, since the concealing composition of the present invention is non-repellent and has a short rewriting handwriting dry time with a water-based ink, it is used in a solid correction tool or a correction sheet (tape). , Showing good quality.

Claims (1)

[Claims] 1. A hiding composition comprising at least a hiding material, a binder, and a water-absorbing polymer.