JPH10338828A - Dot printing ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dot printing ink which can give dots which do not undergo repulsion or blotting even when applied to a lens hard-coated with a film of a silicone, a fluoro resin or the like and can be perfectly and easily erased simply by wiping off with e.g. a cloth when become useless. SOLUTION: This ink comprises at least one solvent selected among esters of 14-20C saturated or unsaturated fatty acids or hydroxy fatty acids derived therefrom with 1-4C aliphatic alcohols and ethers of hydroxy fatty acids derived from 14-20C saturated or unsaturated fatty acids with 1-4C aliphatic alcohols, a colorant, and 0.3-0.7 wt.%, based on the total ink weight, fluorine-containing surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing ink for a hard-coated spectacle lens.

[0002]

2. Description of the Related Art Conventionally, in order to clarify the viewpoint, spectacle lenses have been marked in advance at the time of shipment from a manufacturer. In the case of a marking point, it is useful to use a marker such as a writing instrument filled with ink, or a penetration mark in which porous rubber is impregnated with ink, since it is possible to continuously mark without frequently refilling the ink, JP-A-52-167306 is known. But,
In recent years, lenses hard-coated with silicon-based or fluorine-based coatings have been developed, and conventional marking inks for such lenses will cause cissing and bleeding, which will hinder accurate marking work. It became so. Further, it is required that the mark points can be completely removed so that no trace is left at the time of sale, but it has been difficult to completely remove the conventional ink.

[0003]

Therefore, the present inventor has proposed:
No spotting or bleeding occurs on lenses hard-coated with silicon-based or fluorine-based coatings. When not needed, simply remove the marking ink with a cloth or similar to remove the marking ink completely and easily. Invented.

[0004]

Means for Solving the Problems An ester of a saturated fatty acid or unsaturated fatty acid having 14 to 20 carbon atoms or a hydroxy fatty acid derived therefrom with an aliphatic alcohol having 1 to 4 carbon atoms, and 14 to 20 carbon atoms Selected from ethers of hydroxy fatty acids derived from saturated or unsaturated fatty acids of the formula (I) and aliphatic alcohols having 1 to 4 carbon atoms.
Alternatively, a dot ink comprising two or more solvents, a colorant, and 0.3 to 0.7% by weight of a fluorine-based surfactant based on the total amount of the ink.

Hereinafter, the present invention will be described in detail. In the present invention, an ester of a saturated fatty acid or unsaturated fatty acid having 14 to 20 carbon atoms or a hydroxy fatty acid derived therefrom with an aliphatic alcohol having 1 to 4 carbon atoms, and a saturated fatty acid or unsaturated fatty acid having 14 to 20 carbon atoms. One or more solvents selected from ethers of hydroxy fatty acids derived from saturated fatty acids and aliphatic alcohols having 1 to 4 carbon atoms can be used. The above-mentioned ester of a saturated fatty acid or unsaturated fatty acid having 14 to 20 carbon atoms or a hydroxy fatty acid derived therefrom and an aliphatic alcohol having 1 to 4 carbon atoms is specifically exemplified by palmitic acid, stearic acid and the like. Saturated fatty acids, or unsaturated fatty acids such as eleostearic acid, oleic acid, linoleic acid, linolenic acid, or
A fatty acid arbitrarily selected from hydroxy fatty acids such as hydroxystearic acid and ricinoleic acid derived from the saturated fatty acid or the unsaturated fatty acid, and methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec- Butanol, te
refers to esters with aliphatic alcohols arbitrarily selected from rt-butanol, for example, methyl stearate,
Examples thereof include ethyl oleate, n-propyl linoleate, and n-butyl ricinoleate. The ether of a hydroxy fatty acid derived from a saturated fatty acid having 14 to 20 carbon atoms or an unsaturated fatty acid and an aliphatic alcohol having 1 to 4 carbon atoms may be, for example, any of hydroxy stearic acid and ricinoleic acid. A hydroxy fatty acid selected for methanol, ethanol, n-propanol,
Isopropanol, n-butanol, isobutanol,
sec-butanol or tert-butanol, which means an ether with an aliphatic alcohol arbitrarily selected from, for example, hydroxystearic acid methyl ether, ricinoleic acid ethyl ether, hydroxystearic acid n-propyl ether, ricinoleic acid n-butyl ether, etc. I can give it. In the present invention, one or two or more solvents arbitrarily selected from a solvent group consisting of the ester and the ether can be used. Since these solvents are non-drying solvents, they prevent the ink from drying up and prevent the ink from sticking to the spectacle lens. Further, since the ink is not dried and solidified, it is easy to wipe off the ink from the spectacle lens. In the present invention, the solvent can be used in an amount of 40 to 99% by weight based on the total amount of the ink, but a preferable range is 60 to 95% by weight.

As the colorant, any one or more of known pigments and oil-soluble dyes can be selected and used. As the pigment, conventionally known organic pigments and inorganic pigments can be used without particular limitation. System, isoindolenone system,
Organic pigments such as azomethylene azo, and inorganic pigments such as carbon black, mica, titanium white, pearl pigments, and metal pigments such as iron oxide, aluminum powder, and brass can be used. These pigments are rosin, rosin ester, rosin derivative, phenolic resin, ethyl cellulose, nitrocellulose, ketone resin, vinyl chloride, vinyl acetate,
Kneaded into a pigment dispersant such as vinyl chloride-vinyl acetate copolymer, polyacrylic acid, polymethacrylic acid, styrene-acrylic acid copolymer, polyvinyl butyral, and other known pigment dispersants to prepare a processed pigment. And is easily dispersed when mixed with a solvent. Good results can also be obtained by using a commercially available processed pigment in which the pigment is already kneaded in the dispersant. As the dye, conventionally known oil-soluble dyes can be used without any particular limitation.For example, monoazo, disazo, metal complex salt type monoazo, anthraquinone, phthalocyanine, triallylmethane and the like are used. be able to. In the present invention, since so-called ink separation is unlikely to occur, one or two or more colorants selected from the colorant group of the pigment and the oil-soluble dye can be arbitrarily selected and used while taking into account the hue. In the present invention, the colorant may be used in an amount of 0.5 to 20% by weight based on the total amount of the ink.

In the present invention, a fluorine-containing surfactant is an essential component, and examples thereof include Florad FC-126,
FC-176 and FC-430 (the above are fluorine-based surfactants manufactured by Sumitomo 3M) are preferably used. The fluorine-based surfactant is 0.3 to the total amount of the ink.
0.7% by weight, and the surface tension of the ink of the present invention after blending a fluorine-based surfactant is 20 m · N
/ M or less. In a spectacle lens provided with a hard coat, the fluorine-based surfactant may be added in an amount of 0.1%.
When the amount is less than 3% by weight, repelling of the ink occurs, and when the amount is more than 0.7% by weight, bleeding of the ink occurs, which is not preferable. Further, the surface tension of the ink of the present invention after blending a fluorine-based surfactant is 20 m · N /
If it is higher than m, repelling of the ink occurs, which is not preferable.

The present invention also includes an antioxidant such as dibutylhydroxytoluene, an antiseptic and fungicide such as thiabendazole, rosin, rosin ester, rosin derivative, phenolic resin, ethylcellulose, nitrocellulose, ketone resin, vinyl chloride. , Vinyl acetate, vinyl chloride-vinyl acetate copolymer, polyacrylic acid, polymethacrylic acid,
A pigment dispersant such as a styrene-acrylic acid copolymer and polyvinyl butyral can be arbitrarily compounded.

Hereinafter, the present invention will be described with reference to examples, but it is needless to say that the present invention is not limited to the examples.

[0010]

Example 1 Methyl ricinoleate 90% by weight Carbon black 6% by weight Florad FC-430 0.4% by weight (fluorinated surfactant manufactured by Sumitomo 3M Limited) Rosin ester 3% by weight Dibutylhydroxytoluene 0.6% by weight The carbon black and the rosin ester were put into a three-roll mill and mixed, and then mixed with the remaining substances using a propeller stirrer to obtain a black ink.

[0011]

Example 2 95% by weight of n-butyl linoleate 4% by weight of nigrosine 0.5% by weight of Florade FC-430 (Fluorine surfactant manufactured by Sumitomo 3M) 0.5% by weight of dibutylhydroxytoluene The mixture was mixed with a stirrer to obtain a black ink.

[0012]

Example 3 Ethyl stearate 40% by weight Ricinoleic acid isopropyl ether 40% by weight Carbon black 10% by weight Florad FC-430 0.6% by weight (fluorinated surfactant manufactured by Sumitomo 3M Limited) Nitrocellulose 9% by weight Dibutylhydroxyl Toluene 0.4% by weight The above-mentioned carbon black and nitrocellulose were put into a three-roll mill and mixed, and then mixed with the remaining substance using a propeller stirrer to obtain a black ink.

[0013]

COMPARATIVE EXAMPLE 1 Methyl ricinoleate 90.5% by weight Carbon black 6% by weight Rosin ester 3% by weight Dibutylhydroxytoluene 0.5% by weight A black ink was prepared from Example 1 except that Florade FC-430 was omitted.

[0014]

Comparative Example 2 Methyl ricinoleate 89.5% by weight Carbon black 6% by weight Florad FC-430 1% by weight (fluorinated surfactant manufactured by Sumitomo 3M) Rosin ester 3% by weight Dibutylhydroxytoluene 0.5% by weight A black ink was prepared using 1% by weight of Florard FC-430 of Example 1.

Hereinafter, Examples 1 to 3 and Comparative Examples 1 and 2
Table 1 shows the test results. The test was performed using a porous rubber having open cells impregnated with each of the above inks, and the test was marked. As an object, a spectacle lens provided with a silicon-based hard coat film was used.

[0016]

[Table 1]

[0017]

The marking ink according to the present invention has the effect of preventing cissing or bleeding when marking a spectacle lens provided with a hard coat film, and having the effect of completely wiping and removing the ink.

Claims (1)

[Claims] 1. An ester of a saturated fatty acid having 14 to 20 carbon atoms or an unsaturated fatty acid or a hydroxy fatty acid derived therefrom with an aliphatic alcohol having 1 to 4 carbon atoms, and a saturated fatty acid having 14 to 20 carbon atoms or One or two or more solvents selected from ethers of hydroxy fatty acids derived from unsaturated fatty acids and aliphatic alcohols having 1 to 4 carbon atoms, a colorant, and 0.3 to 0.7 wt. % Of a fluorine-based surfactant.