JPH0297570A - Correcting fluid - Google Patents

Abstract

PURPOSE:To obtain a correcting fluid giving excellent long-term stability, a low viscosity, good flow and good driability to a corrective coating film by mixing a petroleum resin with a thermoplastic styrene elastomer, a specified organic solvent, TiO2 and a surfactant. CONSTITUTION:A correcting fluid is produced by mixing a petroleum resin (e.g., a resin obtained by polymerizing by-product diolefins and monoolefins of an ethylene plant in an unisolated state) with a styrene thermoplastic elastomer (having polystyrene blocks and rubber intermediate blocks), a 6-8C linear or alicyclic saturated hydrocarbon organic solvent (e.g., n-hexane or ethylcyclohexane), TiO2 and a surfactant. This fluid is featured in that it has excellent stability even when left for a long term, a low viscosity, and a good flow, that the corrective coating film have excellent covering effect and leveling properties, flexibility, and good dryability, and that the rewriting does not cause cissing even when it is rewritten with a water-base writing utensil.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to the handwriting of water-based ink such as a water-based ballpoint pen, water-based signboard, fountain pen, etc., or the handwriting of characters such as handwriting of an oil-based ballpoint pen, oil-based signboard, copying, type printing, etc. It is used for correction and concealment, and furthermore, it relates to a correction liquid that dries the correction coating film well and has flexibility.

(Prior Art) Various correction fluids have been commercially available, but most of these correction fluids use acrylic resin as a film-forming binder material (Japanese Patent Publication No. 59-59754).
)Alternatively, a method using an ethylene-vinyl acetate copolymer resin (Japanese Patent Publication No. 1986-6765) is known, but the method using an acrylic resin results in a uniform repair film, but the paint film is It is hard, has a glossy surface, and has the disadvantage of cracking and peeling when bent. To solve this problem, plasticizers and the like have been added.

Correction fluids using ethylene-vinyl acetate copolymer resins have high viscosity and poor fluidity. Furthermore, although the coating film becomes flexible, the ethylene-vinyl acetate copolymer resin has a small dissolving power for volatile solvents such as aromatic hydrocarbons, alicyclic hydrocarbons, and paraffin hydrocarbons that can be used in correction fluids. It has the drawbacks of limited use ratio and poor long-term stability.

Moreover, when the correction fluid to which the reformulation has been added is used to rewrite the corrected coating film with water-based ink, a new problem has arisen in that the water-based ink is repelled.

Furthermore, aromatic hydrocarbons such as toluene and xylene used in conventional correction fluids are unfavorable in terms of toxicity, as they slow drying of the paint film and have a strong odor.

(Means for Solving the Problems) As a result of various studies to solve the above-mentioned drawbacks, the present invention uses a petroleum resin and a styrene thermoplastic elastomer as a film-forming binder, The gist of the present invention is a correction liquid consisting of at least a ring-saturated hydrocarbon organic solvent, titanium oxide, and a surfactant.

The petroleum resin used in the present invention is obtained by polymerizing diolefins and monoolefins produced as by-products from ethylene plants that produce ethylene, propylene, etc. without isolating them, or by polymerizing a fraction of naphtha cracked oil. It dissolves extremely well in ring hydrocarbons and paraffinic hydrocarbons, and has extremely low viscosity and excellent fluidity as a resin for correction fluid, and is commercially available as products such as Escoresotsu (Esoso Co., Ltd.) and Finton (Nippon Zeon). .

Furthermore, the styrenic thermoplastic elastomer used in the present invention has a polystyrene block and a rubber intermediate block, and the polystyrene part forms physical crosslinks and becomes a crosslinking point, and the intermediate rubber block gives flexibility to the coating film. It is effective in modifying the hardness of petroleum resin, forming a good coating film as a correction fluid, and making it easier to apply.Products with names such as Kaliflex (Shell Chemical Co., Ltd.) and Tulprene (Asahi Kasei Co., Ltd.) It is commercially available at.

The amount of the petroleum resin used is preferably 3 to 20% by weight based on the total amount of the correction fluid, and the proportion of the styrene thermoplastic elastomer used is preferably 15 to 45% by weight based on the petroleum resin. If it is less than 15% by weight, the effect of imparting flexibility of the styrene thermoplastic elastomer to the correction coating is small;
If it exceeds 0% by weight, the flexibility will increase and the viscosity will become high, resulting in poor fluidity and making it impossible to apply uniformly.

By using the resin composition obtained according to the present invention, it is possible to increase the amount of titanium oxide that is a masking agent, and it is also possible to make a correction liquid with excellent fluidity, which improves the hiding effect and leveling of the correction surface. A modified surface with excellent flexibility and flexibility can be obtained.

Solvents used in the present invention include normal hexane, normal heptane, which are linear hydrocarbons having 6 to 8 carbon atoms, and have a dissolving power for petroleum resins and styrene thermoplastic elastomers, and have a low boiling point and high evaporation rate. One or more of normal octane, alicyclic saturated hydrocarbons such as cyclopenkune, cyclohexane, methylcyclohexane, and ethylcyclohexane can be used.

Titanium oxide is used to hide handwriting and printing to be corrected, and both rutile type and anatase type can be used.

As the surfactant, nonionic surfactants, polyoxyethylene alkyl ether, polyoxyethylene alkylphenol ether, polyoxyethyl acyl ester, etc. can be used in view of uniform dispersibility, antifoaming properties, and stability of the correction fluid.

The present invention includes white pigments used in this type of correction fluid, such as calcium carbonate, silica, and porous silica to improve rewriting properties, as well as a small amount of coloring to match the color of the paper to be corrected or concealed. Dyes or pigments can be blended as appropriate.

(Effects of the Invention) The correction fluid of the present invention can be obtained by dispersing the above components using a dispersing machine such as a ball mill, a sad grinder, or an attritor.

The correction fluid obtained in this way has excellent stability even if left for a long time, has low viscosity and good fluidity, and the correction coating film has excellent concealment and leveling properties, is flexible, and does not dry easily. It is in good condition and the writing lines do not come off even if you write again with a water-based writing instrument.

(Example) This will be explained below using examples.

Example: Titanium oxide R-820 (Ishihara Sangyo) 58 parts by weight Methylcyclohexane 6 n-hexane Methylcyclohexane 16 n-hexane 14 l/The above components were treated in the same manner as in Example 1 to obtain a correction fluid.

As a comparative example, 45 parts by weight of titanium oxide R-820 (Ishihara Sangyo) Among the above components, Finton D-100 and Tuffrene 406 were dissolved in a mixed solvent of methylcyclohexane and n-hexane, and the other components were added and processed in a ball mill. , 24
A correction fluid was obtained by time dispersion treatment.

Example 2 Titanium dioxide I7-820 (Ishihara Sangyo) 55 parts by weight Toluene 12 xylene
30 Plasticizer D. 0. Eight (
Reagent) 3 Among the above components, Paraloid B-
After dissolving No. 44 in a mixed solvent of toluene and xylene, other components were added and the mixture was dispersed in a ball mill for 24 hours to obtain a correction fluid.

Comparative Example 2 Titanium dioxide R-820 (Ishihara Sangyo) 43 parts by weight 1
,1.1-Trichloroethane 20〃Ethylcyclohexane 32〃Among the components listed above, after dissolving the ethylene-vinyl acetate copolymer in a mixed solvent of 1,1,1-)lichloroethane and ethylcyclohexane,
Other ingredients were added and the mixture was dispersed in a ball mill for 24 hours to obtain a correction fluid.

The correction fluids obtained in Example 1.2 and Comparative Examples 1 and 2 were tested for viscosity, stability, flexibility, hiding property, leveling property, and rewriting property, and the results are shown in Table 1.

*1. Measured using an EH type rotational viscometer at a temperature of 25.0±0.5 degrees.

*2. The samples were placed in a thermostatic chamber at 40 degrees Celsius and 60% humidity for two weeks to see if the liquid would separate.

*3. The correction fluid was uniformly applied with an applicator, and after drying, the correction coating surface was bent and the coating film was observed. Those with no peeling or cracking were rated ◎, and those with × were rated.

*4. After applying the correction fluid uniformly with an applicator and drying, the correction surface was observed. If the base was sufficiently hidden, it was rated ◎, and if the base was slightly visible but still hidden, it was rated ○.

*5. Apply the correction fluid and observe whether the paint film is uniform. If it is not uniform and has unevenness, it is △. If there is unevenness but there is no problem with rewriting, it is 01. If the rewritten handwriting was clear, it was rated ◎.

*6. After applying correction fluid and writing on the dried paint surface, write with water-based ink (Tombow Pencil, Monoball). If the handwriting has some repellency and is difficult to read, mark it as ×, if there is some repellence but it is still legible, mark it as ○, or if there is no repellency, Those that are clear and clear are marked as ◎.

Claims (2)

[Claims] (1) A correction fluid consisting of at least a petroleum resin, a styrene thermoplastic elastomer, a linear and/or alicyclic saturated hydrocarbon organic solvent having 6 to 8 carbon atoms, titanium oxide, and a surfactant. (2) The proportion of styrene thermoplastic elastomer used is
Claim (1) The amount is 10 to 50% by weight based on the petroleum resin.
Correction fluid as stated.