JPH05209143A - Masking composition - Google Patents

Abstract

PURPOSE:To provide the subject composition composed of a masking material, a binder, porous particles, etc., having excellent spacer effect and masking power and suitable as a film-forming material for correction sheet, etc. CONSTITUTION:The objective composition is composed of (A) preferably 40-80wt.% of a masking material such as rutile-type titanium oxide and zinc oxide, (B) preferably 10-60wt.% of a binder such as a (meth)acrylate resin emulsion and (C) preferably 1.0-20wt.% of porous particles and/or hollow particles of silicon dioxide, etc.

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 it as compared with the correction liquid, and that it can be corrected in a short time. As the correction sheet (tape), the masking composition is made into a liquid by using a solvent or by applying heat, and the liquid is applied on a release paper (release tape), dried or cooled, and then used as a masking sheet. The thing which applied the adhesive on the surface of the composition layer 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.

Specific examples of the binder include acrylic resin, vinyl alkyl ether resin, cyclized rubber, styrene-butadiene copolymer type elastomer, (meth) acrylic acid ester type emulsion, styrene-butadiene copolymer resin emulsion, Resin-based substances such as ethylene vinyl acetate resin emulsion or wax-based substances such as paraffin wax and carnauba wax were used.

[0005]

PROBLEM TO BE SOLVED BY THE INVENTION Correction sheet (tape)
In many cases, it is preferable that not only hiding correction of characters, patterns, etc. but also rewriting on the coating film after correction, so that there is no difference in height between the corrected surface and the paper surface. Also, 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 the correction sheet (tape), the hiding material in the hiding composition is in a liquid state by using a solvent or by heating, so that coagulation is likely to occur. The hiding material that has caused co-aggregation does not have a particle size that exhibits the maximum hiding power of the hiding material, and thus the hiding power of the coating film is reduced. Therefore, in order to prevent co-aggregation of the hiding material and obtain the original hiding power of the hiding material, a method of adding spherical particles such as spherical silica and melamine-formaldehyde microspheres can be considered.

However, since the correction sheet (tape) has a very thin coating film, a satisfactory hiding power cannot be obtained only by using the above-mentioned spherical particles to prevent co-aggregation of the hiding material.

The present invention has been made to improve the hiding property of a coating film, and is a gist of a hiding composition comprising at least a hiding material, a binder, and porous particles and / or hollow particles. It is what

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 (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. , Resin-based materials such as styrene-butadiene elastomer, animal-based waxes such as beeswax, spermaceti, and white wax, plant-based waxes such as candelilla wax, carnauba wax, wood wax, and mineral-based waxes such as montan wax and ozokerite. , Paraffin wax,
Wax-based substances such as petroleum-based waxes such as microcrystalline wax may be mentioned. The amount used is preferably 10 to 60% by weight with respect to the total amount of the hiding composition. The binder is a condition at the time of production (for example, when using a solvent to form a liquid, a resin soluble in the solvent used is used, or when heated to form a liquid, a wax-based substance is used). It is selected as appropriate based on the quality required for products).

The porous particles and hollow particles, which are the features of the present invention, are used for increasing the difference in the refractive index between the hiding material and the binder to improve the hiding property of the coating film. Alternatively, it may be an organic substance. A specific example will be described below.

Porous particles of silicon dioxide or hollow particles such as Godball B-6C (average particle size 2.
2 μm), A-11C (average particle size 3.5 μm), B-16C (average particle size 6.5 μm), B-25C
(Average particle size 14.0 μm), E-2C (average particle size 0.7 μm), E-6C (average particle size 2.2 μm),
Same D-11C (average particle size 3.4 μm), same E-16C
(Average particle diameter 6.5 μm) (above, Suzuki Yushi Kogyo Co., Ltd.)
Made), high pressure UF type (particle size: 2.0-5.
Adjustable with 0.1 μm accuracy in the range of 0 μm), same FQ type (0.2, 0.3, 0.5, 1.0, 2.0, 3.
0, 4.0, 5.0 μm) (above, Ube Nitto Kasei Co., Ltd.)
Manufactured) and the like.

Examples of the porous particles made of calcium carbonate include Callite KT (average particle diameter 2.3 μm, manufactured by Shiraishi Calcium Co., Ltd.).

Techpolymer MBTP (adjustable between 5 and 50 μm) as porous particles composed of composite spherical fine particles with polymethylmethacrylate containing 70% by weight or more of titanium oxide, and porous particles obtained by firing techpolymer MBTP Examples include Techpolymer TP (adjustable between 5 and 50 μm) (these are manufactured by Sekisui Plastics Co., Ltd.).

Hollow particles of styrene-acrylic acid copolymer were used as SX863 (A) (particle size 0.3 to 0.4).
μm), SX864 (B) (particle size 0.4 to 0.5 μm
m), SX865 (B) (particle size 0.5-0.6μ)
m), SX863 (P) (0.3 to 0.4 μm) (above, manufactured by Nippon Synthetic Rubber Co., Ltd.), Low Pake OP-84J.
(Average particle diameter 0.55 μm, manufactured by Rohm and Haas Co.) and the like.

As the porous particles made of poly (methyl methacrylate), Techpolymer MBP (adjustable between 3 and 50 μm, manufactured by Sekisui Plastics Co., Ltd.) can be mentioned.

Examples of the porous particles made of polystyrene include Techpolymer SBP (adjustable within 3 to 50 μm, manufactured by Sekisui Plastics Co., Ltd.).

The above-mentioned particles can be used alone or in 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.

The particle size of the above particles is 0.2 to 10 μm.
m is preferred.

A coloring pigment is dispersed in order to match the color tone of the paper to be masked (such as postcards and colored papers), and a plasticizer is dispersed to adjust the hardness of the coating film, and a dispersion is dispersed to disperse the masking material. Various conventionally known additives such as agents can be appropriately added.

[0021]

The porous particles and hollow particles contained in the masking composition according to the present invention have a spacer effect of suppressing the co-aggregation of the primary particles of the masking agent used, and therefore the masking of the masking agent originally intended. As the force is obtained, the air contained in the pores of the porous particles and the hollow portion of the hollow particles lowers the average refractive index of the binder, so that the difference in the refractive index between the hiding material and the binder becomes large, and thus the coating film The hiding power of is increased.

[0022]

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 Godball E-2C 18 parts Homogenol L-18 (Kao Soap Co., Ltd.) 1.2 parts of 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 Godball B-6C 15 parts Homogenol L-18 1.2 parts The above components were used as in 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 SX863 (P) 15 parts Homogenol L-18 2 parts The same ingredients as in Example 1 were used for the concealing composition. (Solvent-soluble type) was obtained.

Example 4 Chronos KR-480 63 parts Califlex TR-1107 (Shell Chemical Co., Ltd., styrene thermoplastic elastomer) 13 parts 1,1,1-trichloroethane 100 parts Techpolymer MBP (average particle diameter) 3.0 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 hiding composition (solvent-soluble type).

Example 5 Chronos KR-380 63 parts Acryloid B-66 13 parts Methylcyclohexane 100 parts Godball B-25C 15 parts Homogenol L-18 1.2 parts The above components are concealed in the same manner as in Example 1. A composition (solvent-soluble type) was obtained.

Example 6 Chronos KR-380 63 parts Acryloid B-66 15 parts Methylcyclohexane 100 parts Godball E-2C 7.5 parts SX863 (P) 7.5 parts Homogenol L-18 1.2 parts Each of the above components In the same manner as in Example 1, a concealing composition (solvent-soluble type) was obtained.

Example 7 Taipaque CR-58 60 parts 130 ° F paraffin wax 13 parts Godball E-2C 15 parts The above components were mixed and dispersed with a two-roll roller heated to 80 ° C. to conceal the composition (heat melting Type).

Example 8 Chronos KR-380 60 parts Carnauba wax 13 parts Godball B-6C 15 parts The above components were treated in the same manner as in Example 7 to obtain a concealing composition (heat melting type).

Example 9 Chronos KR-380 60 parts Candelilla wax 12 parts SX863 (P) 15 parts The above components were treated in the same manner as in Example 7 to obtain a hiding composition (heat melting type).

Example 10 Taipaque CR-58 60 parts Montan wax 15 parts Techpolymer MBP (average particle size 3.0 μm) 10 parts The same components as in Example 7 were used for the concealing composition (heat melting type). Got

Example 11 Chronos KR380 60 parts 130 ° F paraffin wax 15 parts Godball B-25C 12 parts The above components were treated in the same manner as in Example 7 to obtain a hiding composition (heat melting type).

Example 12 Chronos KR-380 60 parts 130 ° F paraffin wax 15 parts Godball E-2C 6 parts SX863 (P) 6 parts The above components were treated in the same manner as in Example 7 (heating). Melted type) was obtained.

Comparative Example 1 A concealing composition (solvent-soluble type) was obtained in the same manner as in Example 1 except that Godball E-2C was omitted.

Comparative Example 2 Example 3 except that Seahost KE-P30 (average particle diameter 0.3 μm, manufactured by Nippon Shokubai Chemical Industry Co., Ltd.), which is spherical silica, was used in place of Godball E-2C in Example 1. In the same manner as in 1, the concealing composition (solvent-soluble type)
Got

Comparative Example 3 A concealing composition (heat-melting type) was obtained in the same manner as in Example 7 except that Godball E-2C was omitted.

Comparative Example 4 A concealing composition (heat-melting type) was obtained in the same manner as in Example 7 except that micro silica 980U, which was spherical silica, was used in place of Godball E-2C. ..

(Production of Correction Sheet) Above-mentioned Examples 1 to 1
4, the hiding composition obtained in Comparative Examples 1 and 2 was applied onto a release paper with an applicator of 50 μm, and after drying, the hiding composition was SK Dyne E-3008BC (Soken Chemical Co., Ltd.).
Manufactured, emulsion type adhesive) and dried to obtain a correction sheet. Further, the concealing compositions obtained in Examples 5 to 8 and Comparative Examples 3 and 4 were heated to 80 ° C. to be melted, coated on a release paper with a 50 μm applicator, and after cooling, S
K Dyne E-3008BC was applied and dried to obtain a correction sheet. A hiding test was conducted on the modified sheet obtained above. The test results of the correction sheets of Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1, and Examples 5 to 8 and Comparative Example 3,
Table 2 shows the test results of the correction sheet according to No. 4.

Concealment test: Coating film formation: The correction sheet is placed with the pressure-sensitive adhesive layer side facing the concealment ratio measurement paper (JIS K 5400), and the coating is transferred by pressing from the release paper side. -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.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

As described above in detail, the concealing composition of the present invention has a high concealing power and exhibits good quality when used as a correction sheet (tape).

Claims (1)

[Claims] 1. A hiding material, a binder, porous particles and / or
Alternatively, a hiding composition comprising at least hollow particles.