JPH0331375A - Cover-up liquid - Google Patents

Abstract

PURPOSE:To obtain a cover-up liquid having excellent masking power, rewritability, set-to-touch time and color-sinking property by using a titanium oxide pigment, an organic solvent and a resin soluble in said solvent as main components and further including a highly water-absorbing polymer. CONSTITUTION:The objective cover-up liquid is composed mainly of (A) preferably 20-50wt.% of titanium oxide constituting the total or at least the main part of pigment, (B) preferably 30-60wt.% of an organic solvent (e. g. n-heptane, cyclohexane, etc., preferably having a boiling point of 70-150 deg.C) and (C) preferably 5-20wt.% of a resin soluble in said solvent (e. g. acrylic resin or alkyd resin) and further contains (D) preferably 0.5-2.0wt.% of a highly water-absorbing polymer (e. g. starch polyacrylate, acrylic acid-vinyl alcohol copolymer or sodium acrylate polymer).

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a pigment whose main components are titanium oxide, which is all or at least the main component, an organic solvent, and a resin soluble in the organic solvent. Regarding liquid.

(Prior art) Titanium oxide, which is all or at least the main component of a pigment,
The coating film of the correction fluid, which is made of an organic solvent and a resin soluble in the organic solvent, is hydrophobic, so if you rewrite the corrected area, there will be no problem with oil-based ink. In the case of fountain pens, felt-tip pens, etc. that use water-based ink, there is a problem that the ink is repelled, making it difficult to write again.

In order to solve the above-mentioned problem, the present inventors have developed a correction liquid that is prepared by adding a silicone block copolymer, an imidacillin derivative, or an ethylene oxide-added fluorosurfactant, and liquid polybutadiene, liquid polybutene,
We proposed a correction fluid made by adding liquid rubber such as liquid polypentadiene.

(Problems to be Solved by the Invention) All of the correction fluids proposed above are excellent in rewriting properties with writing instruments using water-based inks. Correction fluids containing oxide-added fluorine-based surfactants have excellent drying properties for rewritten handwriting, but on the other hand, they tend to cause the "color fading phenomenon" in which the density of handwriting becomes thinner; Correction fluids made by adding liquid rubbers such as polybutadiene, liquid polybutene, liquid polypentadiene, etc. rarely cause "color fading", but
There is a tendency that handwriting tends to take a long time to dry, so it is necessary to improve both the dryness and color fading of handwriting that has been rewritten, and the drying time of handwriting is sufficiently short, and the density of handwriting does not become thinner. In order to be a correction fluid that forms a film,
It was somewhat unsatisfactory.

(Means for Solving the Problems) The present invention provides a correction fluid whose main components are titanium oxide, which is all or at least the main component of a pigment, an organic solvent, and a resin soluble in the organic solvent. The gist of the invention is a correction fluid characterized by containing a super absorbent polymer.

The composition of the present invention will be explained below.

Pigments are used to hide handwriting, and all or at least their main component must be titanium oxide. Titanium oxide can include various types of titanium oxide, such as rutile type and anatase type. Commercially available products include Taitone 5R-1, Taitone R-650. Same R-
3L, A-110, A-150, R-5N (manufactured by Sakai Chemical Industries), Tybake R-580, R-5
50, same R-930. Same A-100. Doujin-220, Doujin CR-58 (manufactured by Ishihara Sangyo ■), Cronos KR-3
10, KR-380, KR-480, KA-10
, KA-20, KA-30 (manufactured by Titanium Kogyo), Taipur R-900, R-931 (manufactured by DuPont Japan Limited 1), etc., and the amount used is based on the correction fluid. It is preferably 20 to 50% by weight based on the total amount.

Furthermore, a coloring pigment may be used in combination to match the color tone with the writing surface of a piece of paper, and an extender pigment such as silica or calcium carbonate may be used in order to improve hiding power.

Organic solvents are used to dissolve resins, adjust viscosity, etc. Specifically, they include toluene, xylene, n-hebutane,
Hydrocarbons such as n-octane, cyclohexane, methylcyclohexane, halogen hydrocarbons such as 1.1゜1-trichloroethane, tetrachloroethylene, ethers such as 1,4-dioxane, n-butyl ether, trioxane, ethyl Ketone solvents such as methyl ketone and methyl-n-propyl ketone, and ester solvents such as propyl formate and ethyl acetate can be used alone or in combination.
Considering the drying time of the coating film, it is preferable to use one with a boiling point of 70°C to 150°C, and the amount used is 30°C based on the total amount of correction fluid.
~60% by weight is preferred.

Note that if paraffinic hydrocarbons such as n-hebutane and n-octane and naphthenic hydrocarbons such as cyclohexane and methylcyclohexane are used as organic solvents, it is possible to correct handwriting made with oil-based ink. .

Examples of resins soluble in the above organic solvents include:
Examples include acrylic resin, alkyd resin, vinyl resin, polyester resin, etc., and the amount used is preferably 5 to 20% by weight based on the total amount of correction fluid.

A specific example of the super absorbent polymer that is a feature of the present invention is Sunwet IM made of starch polyacrylate.
-300MPS, IM-1000MPS (all manufactured by Sanyo Chemical Industries, Ltd.) Sumikagel 5P-520 made of acrylic acid-vinyl alcohol copolymer, Sumikagel NP-1020 made of sodium acrylate polymer (all manufactured by Sumima Chemical Industries, Ltd.) ), which can be used alone or in combination, and the amount used is 0 to the total amount of correction fluid.
．． 1 to 5.0% by weight is preferable, more preferably 0.5% by weight.
~2.0% by weight.

In addition to the above-mentioned ingredients, dispersants and anti-settling agents are used to stabilize pigment dispersion, thickeners are used to adjust viscosity, and plasticizers are applied to adjust the hardness of the coating film. In order to improve the performance, a flow improver or a leveling agent can be added as appropriate.

The correction fluid of the present invention is prepared by ball milling each of the above components.

It is obtained by dispersing and mixing using a stirring disperser such as an attritor or a sand grinder.

(Function) Since the super absorbent polymer contained in the correction fluid of the present invention is dispersed on the surface of the correction coating film and inside the vicinity of the surface, when rewriting is performed using water-based ink, the solvent in the ink ( In particular, moisture) is trapped on the surface of the coating film and/or inside the vicinity of the surface, resulting in gelation.

Therefore, the handwriting dries quickly, and since the ink does not penetrate into the interior of the coating film, it is presumed that the phenomenon of color fading is suppressed as much as possible.

(Example) Hereinafter, "parts" simply means "parts by weight."

11 Tsubagami Kronos KR-38065 parts (manufactured by Titan Kogyo, rutile type titanium) Acryloid B-6612 parts (manufactured by Rohm & Barr, USA, acrylic resin) 1.1,
1. -Trichloroethane 120 parts Mizukashir P-
8012, part (manufactured by Mizusawa Chemical Industry @, fine silica) Sanwetto 300MPS 1.2
1 part (manufactured by Sanyo Kasei Kogyo ■) Homogenol L-181, 2 parts (manufactured by Kao Soap ■, dispersant) Each of the above components was dispersed in a ball mill for 24 hours to obtain a correction liquid.

KR-aao 60 parts Acryloid B-6713 parts (acrylic resin, manufactured by Rohm & Haas, USA) Methylcyclohexane 100 parts Sansuet IN
-lN-1O001, 8 parts (manufactured by Sanyo Chemical Industries, Ltd.) Mizukasil P-8012 parts MA-1000,05 parts (manufactured by Mitsubishi Chemical Industries, Ltd., carbon black) Homogenol L-181 parts The above components were added in the same manner as in Example 1. I got correction fluid without it.

Chronosu KR-38070 parts Acryloid B-6610 parts
A correction liquid was obtained in the same manner as in Example 1 using 0.5 parts of MA-1000 (manufactured by University of Technology, plasticizer) and 5 parts or more of Homogenol L-181.

Taisan Goto Kronos KR-38070 parts Acryloid B-6710 parts Methylcyclohexane 70 parts Ethylcyclohexane 30 parts Sumikagel NP-
10201, 9 parts (Jinmin Chemical Industry Co., Ltd. Mizukashiru P-8012 parts DOA 2.5 parts MA-10
A correction solution was obtained in the same manner as in Example 1 using 0.005 parts of Homogenol L-181 and 3 parts or more of each component.

Cronos KR-38070 parts Acryloid B-6610 parts
A correction solution was obtained in the same manner as in Example 1 using 0.005 parts of Homogenol L-181 and 5 parts or more of each component.

A correction fluid was obtained in the same manner as in Example 1 except that Sunwet IM-300MPS in Example 1 was removed.

Except for Sunwet IM-300MPS in Example 1, silicone block copolymer (L-7500
A correction fluid was obtained in the same manner as in Example 1, except that 1 part of the solution (manufactured by Nippon Unicar Co., Ltd.) was added.

Skin comparison: Except for Sunwet IM-1000MPS in Example 2, 2 parts of ethylene oxide-added fluorine-based surfactant (Surflon S-341, manufactured by Asahi Glass ■) were added.
A correction fluid was obtained in the same manner as in Example 2.

A correction liquid was obtained in the same manner as in Example 3, except that Sumikagel 5P-520 in Example 3 was removed and 3 parts of liquid butadiene (Poly bd R-45HT, manufactured by Idemitsu Petrochemicals Ltd.) was added. Ta.

(Effects of the Invention) As described above, the correction fluids obtained in Examples 1 to 5 and Comparative Examples 1 to 4 were tested for hiding rate, rewriteability, touch drying time, and color fading.

The results are shown in Table 1.

Table 1 ×1 Hiding rate: The above correction liquid was
5400) with a 2 mil applicator, and after drying, the diffused emissivity at 45° and 0° was measured and calculated.

*2 Re-writability: Write on the paint film of the repaired area with a writing instrument using water-based ink (Made by Bentel, ballpoint pen B-100), and check if the handwriting is repellent. things r
It was named QJ.

*3 Drying time to touch: The above water-based ink was written on the coating film of the corrected area, and after writing, the written area was rubbed with a finger, and the time until the ink stopped adhering to the finger was measured.

*4 color sinkability: Write on the paint film in the repaired area with a writing instrument using water-based ink (Pentel ■, ballpoint pen B-100), and check the handwriting after drying and the above writing instrument on the unpainted area. Compare with handwriting.

RQJ is approximately the same concentration, [0] is slightly thinner.
, those that felt slightly thinner were designated as "Δ", and those that were clearly thinner were designated as rXJ.

Note that an adhesion test was conducted on the correction fluids of Examples 1 to 5. The results are shown in Table 2.

Table 2 Apply to SK5400) with a 2 mil applicator, and after drying, fold it in half with the applied part inside, and
Place a weight of mm and weight 50g and leave it for 30 seconds, then fold the same fold in the opposite direction and place the weight again in the same way.
Visually observe the peeling state of the paint film, and if there is no peeling, mark it as "0".
”, those with slight peeling are marked “Δ”, and those with noticeable peeling are marked “×”
”.

As explained above in detail, the correction fluid of the present invention has sufficient concealing properties as a correction fluid, and can be rewritten with water-based ink on the corrected area, and the handwriting has good drying properties. , and is an excellent correction fluid with little color fading.

Claims (1)

[Claims] Titanium oxide, which is all or at least the main component of the pigment,
1. A correction fluid whose main components are an organic solvent and a resin soluble in the organic solvent, the correction fluid containing a super absorbent polymer.