JPH05179180A - Hiding composition - Google Patents

Abstract

PURPOSE:To obtain a hiding composition excellent in hiding power and useful for a solid eraser, an erasing sheet or tape essentially consisting of a hiding material, a binder and specified particles. CONSTITUTION:The title composition comprises a hiding material (e.g. titanium oxide), a binder (e.g. acrylic resin) and particles having a refractive index of 1.8 or below and a mean particle diameter of 0.2-10mum (e.g. silica).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concealing composition used for a solid correction tool and a correction sheet (tape).

[0002]

2. Description of the Related Art Conventionally, a correction liquid, a solid correction tool, a correction sheet (tape) for concealing correction of characters, patterns, etc.
Are known. In particular, the solid correction tool and the correction sheet (tape) have the advantage that they do not require a waiting time until rewriting after concealing compared with the correction liquid. Here, as the solid correction tool, for example, a hiding composition capable of forming a hiding coating film formed into a specific shape is formed into a pencil shape, or incorporated into a feeding container and used. As the correction sheet (tape), the hiding composition is applied to a release paper (release tape) as a liquid using a solvent or as a liquid by applying heat, and after drying or cooling, the hiding composition layer is formed. The thing which applied the adhesive on the surface can be illustrated. Such a solid correction tool,
A hiding composition used for a correction sheet (tape) and forming a hiding coating film or a hiding transfer film (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.

Specifically, the binder is an acrylic resin, a vinyl alkyl ether resin, a cyclized rubber, a styrene-butadiene copolymer type elastomer, a (meth) acrylic acid ester type resin emulsion, a styrene-butadiene copolymer resin emulsion. Resin materials such as ethylene vinyl acetate resin emulsions or wax materials such as paraffin wax and carnauba wax were used.

[0005]

The solid correction tool and correction sheet (tape) not only make concealment correction of characters, patterns, etc., but often make rewriting on the coating film after correction. It is preferable that there is no difference in height between the correction surface and the paper surface. Further, if the height difference is large, the shadow of the corrected surface may appear when copying. Therefore, it is necessary to have a high hiding power even with a thin coating film.

However, in the production of a solid correction tool and a correction sheet (tape), the masking composition is liquified by using a solvent or by heating, so that the masking material tends to cause coaggregation. The hiding material that caused co-aggregation is not the particle size showing the maximum hiding power that the hiding material has, so the hiding power of the coating film decreases, and it was difficult to sufficiently cover the repaired portion with a thin coating film. ..

[0007]

The present invention has been made to improve the concealing property of a coating film, which comprises a concealing material, a binder, a refractive index of 1.8 or less, and an average particle diameter. Is 0.2-
The gist is a concealing composition comprising at least 10 μm particles.

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 Limited) and the like. The amount used is preferably 40 to 80% by weight based on the total amount of the correction tape coating composition.

The binder is used by the hiding composition to form a good coating film. Specific examples include (meth) acrylic acid ester-based resin emulsion, styrene-butadiene copolymer-based resin emulsion, ethylene vinyl acetate resin emulsion, acrylic resin, alkyd resin, vinyl resin, polyester resin, vinyl alkyl ether resin, cyclized rubber, Resinous substances such as styrene-butadiene elastomers, animal waxes such as beeswax, spermaceti, insect white wax, candelilla wax, carnauba wax, plant waxes such as wood wax, montan wax, mineral waxes such as ozokerite, Examples include wax-based substances such as petroleum-based waxes such as paraffin wax and microcrystalline wax. The amount used is preferably 10 to 60% by weight with respect to the total amount of the hiding composition. The above-mentioned binder contains a lot of wax-based substances under the conditions at the time of production (for example, when using a solvent to make a liquid, a soluble resin is used as the solvent to be used, or when making a liquid by heating). It is selected appropriately based on the quality required for the product).

Particles having a refractive index of 1.8 or less and an average particle diameter of 0.2 to 10 μm, which is a feature of the present invention, are obtained by preventing coaggregation of the hiding material particles dispersed in the liquid. It is used to improve the hiding power of the coating film,
It may be an inorganic substance or an organic substance. A specific example will be described below.

Silicon dioxide (refractive index 1.41 to 1.4
9) as particles consisting of micro silica 980U (average particle size 0.3 μm, manufactured by Elchem Japan Co., Ltd.), Seahoster KE-P30 (average particle size 0.3 μm), KE-P50 (average particle size 0.5 μm) ), The same KE-P1
00 (average particle size 1.0 μm) (above, manufactured by Nippon Shokubai Chemical Co., Ltd.) and the like.

As particles made of calcium carbonate (refractive index 1.63), Snowlight SS (average particle diameter 2.2 μ)
m), the same SSS (average particle size 1.8 μm), MC coat P-13 (average particle size 2.0 μm), the same S-13 (average particle size 2.0 μm), EC-1 (average particle size 2. 2μ
m), EC-5 (average particle size 2.7 μm), M white (average particle size 3.0 μm), M-300 (average particle size 0.8 μm), Super # 1500 (average particle size 1.5).
μm), the same # 1700 (average particle size 1.3 μm), the same #
2000 (average particle size 1.1 μm), # 2300 (average particle size 1.0 μm) (above, Maruo Calcium Co., Ltd.), Whiten SSB (average particle size 1.25 μm)
m), the same # 450 (average particle diameter 8.0 μm) (above, manufactured by Shiraishi Industry Co., Ltd.), Tamapearl TP-111 (average particle diameter 1.5 μm, manufactured by Okutama Industry Co., Ltd.) and the like.

As particles made of alumina silicate (refractive index 1.56), ASP-072 (average particle diameter 0.3 μm)
m), 100/200 (average particle size 0.4 μm), 170 (average particle size 0.4 μm), 600 (average particle size 0.6 μm), 400P (average particle size 4.8 μm).
m), SATINTONE W / WHITETEX (average particle size 1.4 μm), SP-33 (average particle size 1.
4 μm), the same SPECIAL (average particle size 1.2 μm
m), the same No. 5 (average particle size 0.8 μm) (above, manufactured by ENGELHARD, USA) and the like.

Precipitable barium sulphate # 100 (average particle size 0.6 μm) and the same # 300 (average particle size 0.8 μm) are used as particles of precipitated barium sulphate (refractive index 1.64).
m), the same special product (average particle size 4.2 μm), (above, manufactured by Maruo Calcium Co., Ltd.) and the like.

Polymethacrylic acid ester (refractive index 1.4
MR-7G (average particle size 7μ)
m, manufactured by Soken Chemical Co., Ltd., Techpolymer MBX4 (average particle size 4 μm), MBX8 (average particle size 8 μm) (above, manufactured by Sekisui Plastics Co., Ltd.) and the like.

As particles made of polystyrene (refractive index 1.59), techpolymer SBX5 (average particle diameter 5 μm
m), MBX8 (average particle size 8 μm) (above, manufactured by Sekisui Plastics Co., Ltd.) and the like.

Other magnesium carbonate (refractive index 1.52
~ 1.53), magnesium silicate (refractive index 1.54)
Particles such as can also be used.

The above particles can be used alone or as a mixture, and the amount thereof is 0.
1 to 30% by weight is preferable, and 1.0 to 2 is more preferable.
It is 0% by weight.

[0019]

The particles having a refractive index of 1.8 or less and an average particle diameter of 0.2 to 10 μm contained in the concealing composition according to the present invention are used as primary particles in a dissolved or molten liquid concealing composition. It is presumed that the hiding power is prevented from being lowered by apparently acting to prevent aggregation of the hiding material dispersed. The reason is as follows. The hiding power of the hiding material is greatly influenced by the diameter of the particles, and the optimum particle size can be calculated from the refractive index of the hiding material and the binder used. However, the fine hiding material easily aggregates, causing a deviation from the optimum particle size, resulting in a decrease in hiding power. When particles having a refractive index of 1.8 or less and an average particle diameter of 0.2 to 10 μm are added to the concealing composition, the particles are separated between the concealing material and the concealing material when the concealing material tries to aggregate. Be caught in. In this case, the aggregated hiding materials are at least 0.2 μm because the particles are sandwiched between them.
Are separated by the distance. Moreover, this particle has a refractive index of 1.
Since particles of 8 or less are used, the particles in the coating film are optically equivalent to the binder. That is, the concealing composition according to the present invention does not become particles that are optically united because the concealing materials cannot be close to each other, and moreover, the particles existing between the concealing materials are substantially the same as the optical binder. Since they are the same, the hiding material is apparently not aggregated, and therefore, the hiding power does not decrease.

[0020]

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

Example 1 Chronos KR-380 65 parts Acryloid B-66 (acrylic resin manufactured by Rohm & Haas Company, USA) 25 parts Methylcyclohexane 120 parts Microsilica 980U (refractive index 1.41 to 1.49, average particle diameter) 0.3 μm) 18 parts Homogenol L-18 (manufactured by Kao Corporation, dispersant) 1.2 parts After the above components are dispersed in a ball mill for 24 hours, a concealing composition (solvent for a correction sheet (tape)) Obtained in liquid form).

Example 2 Chronos KR-380 60 parts Acryloid B-67 13 parts 1,1,1-trichloroethane 100 parts Seahost KE-P30 (refractive index 1.41 to 1.49, average particle diameter 0.3 μm) 15 Parts Homogenol L-18 1.2 parts The above components were treated in the same manner as in Example 1 to obtain a masking composition for a correction sheet (tape) (liquefied with a solvent).

Example 3 Chronos KR-380 60 parts Acryloid B-66 12 parts Methylcyclohexane 20 parts Cyclopentane 80 parts M-300 (refractive index 1.63, average particle size 0.8 μm) 15 parts Homogenol L-18 1 Parts In the same manner as in Example 1, the above components were used to obtain a masking composition for a correction sheet (tape) (made liquid in a solvent).

Example 4 Chronos KR-380 60 parts Paraloid B-44 (acrylic resin by Rohm & Haas Company, USA) 10 parts 1,1,1-trichloroethane 110 parts Snowlight SS (refractive index 1.63, average particle size) Diameter 2.2 μm) 10 parts Homogenol L-18 2 parts The above components were treated in the same manner as in Example 1 to obtain a concealing composition for a correction sheet (tape) (made liquid in a solvent).

Example 5 Chronos KR-480 65 parts Paraloid B-44 13 parts 1,1,1-trichloroethane 110 parts Whitent SSB (refractive index 1.63, average particle size 1.25 μm) 10 parts Homogenol L-18 1.5 parts The above components were treated in the same manner as in Example 1 to obtain a masking composition for a correction sheet (tape) (made in a liquid form with a solvent).

Example 6 Chronos KR-480 63 parts Califlex TR-1107 (Styrene thermoplastic elastomer manufactured by Shell Chemical Co., Ltd.) 13 parts 1,1,1-Trichloroethane 100 parts ASP-100 / 200 (refractive index 1.56, average particle size 0.4 μm) 15 parts Homogenol L-18 1.2 parts The above components were treated in the same manner as in Example 1 to prepare a concealing composition for a correction sheet (tape) (liquefied with a solvent). Stuff).

Example 7 Chronos KR-480 67 parts Asaprene T431 (styrene-type thermoplastic elastomer manufactured by Asahi Chemical Industry Co., Ltd.) 13 parts 1,1,1-trichloroethane 100 parts ASP-072 (refractive index 1.56, average) Particle size 0.3 μm) 12 parts Homogenol L-18 1.1 parts The above components were treated in the same manner as in Example 1 to obtain a masking composition (made liquid in a solvent) for a correction sheet (tape). ..

Example 8 TYPURE R-900 63 parts Califlex TR-1107 11 parts Cyclohexane 100 parts Precipitating barium sulfate # 100 (refractive index 1.64, average particle size 0.6 μm) 15 parts Homogenol L-18 1 part The above components were treated in the same manner as in Example 1 to obtain a concealing composition for a correction sheet (tape) (made in a liquid state with a solvent).

Example 9 TYPURE R-900 60 parts Asaprene T431 14 parts Methylcyclohexane 110 parts Precipitating barium sulfate # 300 (refractive index 1.64, average particle size 0.8 μm) 18 parts Homogenol L-18 1.2 parts The above components were treated in the same manner as in Example 1 to obtain a concealing composition for a correction sheet (tape) (made in a liquid state with a solvent).

Example 10 Taipaque CR-58 65 parts Acryloid B-66 15 parts Methylcyclohexane 121 parts Techpolymer MBX4 (refractive index 1.49, average particle size 4 μm) 13 parts Homogenol L-18 1 part The above components were carried out. In the same manner as in Example 1, a concealing composition for a correction sheet (tape) (made liquid by a solvent) was obtained.

Example 11 Taipaque CR-58 64 parts Acryloid B-66 13 parts Methylcyclohexane 100 parts Techpolymer SBX5 (refractive index 1.60, average particle diameter 5 μm) 1 part The same components as in Example 1 were not used. Thus, a concealing composition for a correction sheet (tape) (made into a liquid with a solvent) was obtained.

Example 12 Chronos KR-380 65 parts 130 ° F paraffin wax 25 parts Microsilica 980U (refractive index 1.41 to 1.49, average particle diameter 0.3 μm) 18 parts The above components were heated to 80 ° C. The two rolls were mixed and dispersed to obtain a concealing composition (heat melting type) for a correction sheet (tape).

Example 13 Chronos KR-380 60 parts Carnauba wax 13 parts Seahoster KE-P30 (refractive index 1.41 to 1.49, average particle size 0.3 μm) 15 parts The above components were the same as in Example 12. Thus, a concealing composition (heat melting type) for a correction sheet (tape) was obtained.

Example 14 Chronos KR-380 60 parts Candelilla wax 12 parts M-300 (refractive index 1.63, average particle size 0.8 μm) 15 parts The same components as in Example 12 were used to make a correction sheet. A concealing composition (heat melting type) for (tape) was obtained.

Example 15 Chronos KR-380 60 parts Montan wax 15 parts Snowlight SS (refractive index 1.63, average particle size 2.2 μm) 10 parts Each of the above components was processed in the same manner as in Example 12 and a correction sheet ( A concealing composition (heat melting type) for tape) was obtained.

Example 16 Chronos KR-480 65 parts 130 ° F paraffin wax 13 parts Whitent SSB (refractive index 1.63, average particle size 1.25 μm) 10 parts The same components as in Example 12 were used. A concealing composition (heat melting type) for a correction sheet (tape) was obtained.

Example 17 Chronos KR-480 63 parts Carnauba wax 13 parts ASP-100 / 200 (refractive index 1.56, average particle size 0.4 μm) 15 parts The above components were modified in the same manner as in Example 12. A concealing composition (heat melting type) for a sheet (tape) was obtained.

Example 18 Chronos KR-480 67 parts Montan wax 13 parts ASP-072 (refractive index 1.56, average particle size 0.3 μm) 12 parts The same components as in Example 12 were used to prepare a correction sheet ( Tape).

Example 19 TYPURE R-900 63 parts Candelilla wax 12 parts Precipitating barium sulfate # 100 (refractive index 1.64, average particle size 0.6 μm) 15 parts The same components as in Example 12 were used. Thus, a concealing composition for a correction sheet (tape) (heat melting type) was obtained.

Example 20 TYPURE R-900 60 parts Candelilla wax 14 parts Precipitable barium sulfate # 300 (refractive index 1.64, average particle size 0.8 μm) 18 parts The same components as in Example 12 were used. Thus, a concealing composition for a correction sheet (tape) (heat melting type) was obtained.

Example 21 Taipaque CR-58 65 parts Montan wax 13 parts Techpolymer MBX4 (refractive index 1.49, average particle size 4 μm) 13 parts The above components were processed in the same manner as in Example 12 to prepare a correction sheet (tape). A concealing composition (heat melting type) was obtained.

Example 22 Taipaque CR-58 64 parts 130 ° F paraffin wax 13 parts Techpolymer SBX5 (refractive index 1.60, average particle size 5 μm) 1 part The above components were the same as in Example 12 and a correction sheet A concealing composition (heat melting type) for (tape) was obtained.

Example 23 Chronos KR-380 65 parts 130 ° F paraffin wax 25 parts Microsilica 980U (refractive index 1.41 to 1.49, average particle size 0.3 μm) 18 parts In the same manner, a concealing composition for a solid correction tool was obtained.

Example 24 Chronos KR-380 60 parts Carnauba wax 13 parts Seahost KE-P30 (refractive index 1.41 to 1.49, average particle size 0.3 μm) 15 parts The same components as in Example 12 were used. Thus, a concealing composition for a solid correction tool was obtained.

Example 25 Chronos KR-380 60 parts Candelilla wax 12 parts M-300 (refractive index 1.63, average particle diameter 0.8 μm) 15 parts Solid correction was carried out in the same manner as in Example 12. A masking composition for ingredients was obtained.

Example 26 Chronos KR-380 60 parts Montan wax 15 parts Snowlight SS (refractive index 1.63, average particle size 2.2 μm) 10 parts The above components were the same as in Example 12 to give a solid correction tool. A concealing composition was obtained.

Example 27 Chronos KR-480 65 parts 130 ° F paraffin wax 13 parts Whitent SSB (refractive index 1.63, average particle size 1.25 μm) 10 parts The same components as in Example 12 were used. A concealing composition for a solid correction tool was obtained.

Example 28 Chronos KR-480 63 parts Carnauba wax 13 parts ASP-100 / 200 (refractive index 1.56, average particle size 0.4 μm) 15 parts The above components were solidified in the same manner as in Example 12. A concealing composition for a correction tool was obtained.

Example 29 Chronos KR-480 67 parts Montan wax 13 parts ASP-072 (refractive index 1.56, average particle size 0.3 μm) 12 parts The above components were the same as in Example 12 to give a solid correction tool. A concealing composition was obtained.

Example 30 TYPURE R-900 63 parts Candelilla wax 12 parts Precipitable barium sulfate # 100 (refractive index 1.64, average particle size 0.6 μm) 15 parts The same components as in Example 12 were used. Thus, a concealing composition for a solid correction tool was obtained.

Example 31 TYPURE R-900 60 parts Candelilla wax 14 parts Precipitating barium sulfate # 300 (refractive index 1.64, average particle diameter 0.8 μm) 18 parts The same components as in Example 12 were used. Thus, a concealing composition for a solid correction tool was obtained.

Example 32 Taipaque CR-58 65 parts Montan wax 13 parts Techpolymer MBX4 (refractive index 1.49, average particle size 4 μm) 13 parts The same components as in Example 12 were used to conceal a solid correction tool. A composition for use was obtained.

Example 33 Taipaque CR-58 64 parts 130 ° F paraffin wax 13 parts Techpolymer SBX5 (refractive index 1.60, average particle size 5 μm) 1 part The above components were solid corrected in the same manner as in Example 12. A masking composition for ingredients was obtained.

Comparative Example 1 A concealing composition for a correction sheet (tape) (made liquid in a solvent) was obtained in the same manner as in Example 1 except that 980 U of microsilica was omitted.

Comparative Example 2 Arasorb 800F made of polyacrylate instead of 980U of microsilica in Example 1 (refractive index 1.5, average particle diameter 40 μm, manufactured by Arakawa Chemical Industry Co., Ltd.)
In the same manner as in Example 1 except that was used, a concealing composition for a correction sheet (tape) (made liquid with a solvent) was obtained.

Comparative Example 3 Calcium carbonate MC-T (refractive index 1.6, average particle size 0.
A concealing composition (made into a liquid form with a solvent) for a correction sheet (tape) was obtained in the same manner as in Example 1 except that 07 μm, manufactured by Maruo Calcium Industry Co., Ltd. was used.

Comparative Example 4 The same as Example 1 except that zinc white (refractive index 2.0, average particle size 0.75 μm, manufactured by Tokyo Kagaku Co., Ltd.) was used in place of micro silica 980U in Example 1. Thus, a concealing composition for a correction sheet (tape) (made in a liquid state with a solvent) was obtained.

Comparative Example 5 A concealing composition (heat melting type) for a correction sheet (tape) was obtained in the same manner as in Example 12 except that 980 U of microsilica was omitted.

Comparative Example 6 A concealing composition (heat-melting type) for a correction sheet (tape) was obtained in the same manner as in Example 12 except that Arasorb 800F was used instead of 980U of microsilica.

Comparative Example 7 A concealing composition (heat melting type) for a correction sheet (tape) was prepared in the same manner as in Example 12 except that calcium carbonate MC-T was used in place of the microsilica 980U. Obtained.

Comparative Example 8 A concealing composition (heat melting type) for a correction sheet (tape) was obtained in the same manner as in Example 12 except that zinc white was used instead of 980 U of microsilica.

Comparative Example 9 A concealing composition for a solid correction tool was obtained in the same manner as in Example 23 except that 980U of microsilica was omitted.

Comparative Example 10 A concealing composition for a solid correction tool was obtained in the same manner as in Example 23 except that Alassorb 800F was used instead of 980U of microsilica in Example 23.

Comparative Example 11 A concealing composition for a solid repair tool was obtained in the same manner as in Example 23 except that calcium carbonate MC-T was used instead of 980 U of microsilica.

Comparative Example 12 A concealing composition for a solid repair tool was obtained in the same manner as in Example 23 except that zinc white was used in place of 980U of microsilica in Example 23.

The masking compositions obtained in Examples 1 to 11 and Comparative Examples 1 to 4 were coated on a release paper with a 50 μm applicator, dried, and then SK Dyne E-300 8B.
C (manufactured by Soken Chemical Industry Co., Ltd., emulsion type adhesive) was applied and then dried to obtain a correction sheet. Examples 12-22,
The concealing compositions obtained in Comparative Examples 5 to 8 were heated to 80 ° C. to be melted, coated on a release paper with a 50 μm applicator, and after cooling, coated with SK Dyne E-300 8BC. It dried and the correction sheet was obtained. Examples 23-3
3. The concealing compositions obtained in Comparative Examples 9 to 12 were molded by injection molding to obtain rod-shaped solid drawing materials. A hiding test was conducted on the correction sheet and the solid correction tool obtained as described above. The test results of the correction sheets according to Examples 1 to 11 and Comparative Examples 1 to 4 are shown in Table 1, the test results of the correction sheets according to Examples 12 to 22 and Comparative Examples 5 to 8 are shown in Table 2, and Example 23 to Table 3 shows the test results of the solid correction tools of 33 and Comparative Examples 9 to 12.

Concealment rate test: Correction sheet: The correction sheet is placed with the pressure-sensitive adhesive layer side facing the concealment rate measurement sheet (JIS K5400) and pressed from the release paper side to transfer the coating film. ..Solid correction tool: A solid correction tool is used to apply 5 reciprocations with a load of 0.5 kg to the hiding rate measurement sheet. -Measurement of hiding ratio: The hiding ratio was calculated by measuring the 45 ° and 0 ° diffuse reflectance of the hiding ratio measuring paper on which the coating film was formed as described above with a color computer.

[0068]

[Table 1]

[0069]

[Table 2]

[0070]

[Table 3]

[0071]

INDUSTRIAL APPLICABILITY As described above in detail, the correcting composition of the present invention has a high hiding power and exhibits good quality when used in a solid correction tool or a correction sheet (tape).

Claims (1)

[Claims] 1. A hiding composition comprising at least a hiding material, a binder, and particles having a refractive index of 1.8 or less and an average particle diameter of 0.2 to 10 μm.