JPS6221036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink for a writing instrument, particularly an ink for an ink absorber used in a writing instrument called a general felt-tip pen or a marking pen.

The pigment components of this type of ink conventionally used are water-soluble dyes such as acid dyes, direct dyes, and basic dyes in the case of water-based inks, and salt-forming dyes in the case of organic solvent-based inks. , metal-containing dyes and so-called oil-soluble dyes without water-soluble groups are used. The vehicle composition of these dyes is determined according to their quality characteristics and the inks are made into inks, but in each case, the characteristics of the inks using dyes are that all other colors except black are transparent colors, so they are white or white. If you write on a substrate other than a similar light-colored substrate, the ink color will not appear even if you write because it is transparent and the color and surface condition of the substrate will be visible through the ink film. It has no drawbacks.

Among these types of inks currently on the market, there is white ink. Although this ink is opaque, it uses titanium white (mainly rutile type, TiO ₂ ) as a hue component, so it has a high intensity and can be used on any color substrate. Although this ink is a dispersion ink, the specific gravity of the titanium white is high, so the dispersion system easily collapses, and its structure as a writing instrument is different from that of inks that use dyes as pigment components, and it uses a porous ink absorber. A structure in which ink is absorbed inside the writing instrument is unusable due to excessive loss of pigment components.Therefore, at present, ink is directly poured into the writing instrument shaft without using an ink absorber, and the dispersion system collapses, resulting in the production of titanium white. On the premise that precipitation will occur, steel or glass balls are used in the ink for stirring during writing. As a result, the ink flows unevenly when writing, making it difficult to write.In addition to the disadvantage that if the titanium white is left unused for a while, the precipitate of titanium white will settle and solidify at the bottom of the container, and will not be redispersed even if stirred. are doing.

The ink of the present invention is characterized by changing the transparent color of currently commercially available inks to an opaque color as described above, giving the ink a strong force so that it can be written on any substrate, and furthermore, the ink is structurally suitable for use as a writing instrument. In order to keep the flow constant, the ink is such that no abnormal phenomenon occurs even if the ink is absorbed into the ink absorbing body like a general felt-tip pen, and the hue is almost unlimited in addition to black and white. This is an ink that has the characteristic that it can be colored in different ways.

The compositional feature of the ink of the present invention lies in the composition of the pigment component. First, in order to impart opacity to the ink, it is necessary to use a pigment with high intensity and fine particles.Secondly, in order to use an ink absorber for the structure of a writing instrument, it is necessary to use a pigment with good dispersibility (or It is necessary to use pigments with a light specific gravity (mostly non-sedimentable). Therefore, pigments that satisfy these conditions are generally: (1) Inorganic pigments made from titanium white (anatase type or rutile type) and mica (mainly muscovite), in which titanium white is coated on mica. In addition to lightening the specific gravity as a type of titanium white, the thickness of the titanium white film not only gives it a white color, but also allows complementary colors to pass through by reflecting a portion of the incident light, resulting in a reflected color and a transmitted color, respectively. It also has

(2) A pigment in which titanium white is coated on mica and then iron oxide, Prussian blue, or chromium oxide is coated on top of the mica. In the case of blue, it is a blue color, and in the case of chromium oxide, it is a blue-green color.

(3) A bright white pigment made by coating mica with bismuth oxychloride (BiOCl).

The specific gravity of each of these pigments is approximately 3, which is lighter than that of titanium white (approximately 4.2), and their impact strength is comparable to that of titanium white (approximately 2.5). Therefore, when made into an ink, the dispersion stability is very high, and the particle size is also 2.
Since the particle size ranges from microns to 20 microns, even after it is absorbed into the ink storage body, it moves along with the movement of the ink vehicle, so there is no chance that it will be lost.

Regarding the production of the ink of the present invention, pigments and oil-soluble dyes are used as coloring components as described above, rodin, alkyd resin, phenol resin, etc. are used as resin components, and polyoxyethylene glycerol monostearate or polyoxyethylene glycerol monostearate or polyoxyethylene glycerol monostearate is used as a dispersing agent. Ethylene sorbitan monostearate and the like are added, and as solvent components, solvents for general marking pen inks such as ethanol, isopropanol, isobutanol, methyl cellosolve, and ethyl cellosolve are blended in order of evaporation rate. The pigment used in the present invention is a so-called processed pigment that uses mica as a substrate and is coated with a pigment such as titanium white. Therefore, care must be taken when stirring, and strong stirring such as a high-speed shear mixer will destroy the crystals and reduce the luster. It will cause a loss.

Specific examples of the ink according to the present invention are as follows.

A Preparation of toner (mother liquor) A-1 Pigment in (1) TIMIRON Supersheen (MP1005) manufactured by Merck 30% Dispersant ARLACEL60 (sorbitan monostearate) ICI manufactured in the USA 10% TWEEN60 (polyoxyethylene sorbitan monostearate) ICI Made in the USA 10% solvent Ethyl alcohol 30% Isobutyl alcohol 20% First, the dispersant is added while stirring the solvent, and finally the pigment is gradually added and stirred for 1 hour after addition to complete.

A-2 Toner was prepared in the same manner as in A-1 using the above (2) pigment COLORON Bright gold manufactured by Merck 30%, dispersant ARLACEL60 10% TWEEN60 10%, solvent ethyl alcohol 30% and isobutyl alcohol 20%. shall be.

A-3 A toner is prepared in the same manner as in A-1 above using the above (3) pigment MIBIRON manufactured by Merck 30%, dispersant ARLACEL60 10% TWEEN60 10%, solvent ethyl alcohol 30% and isobutyl alcohol 20%.

A-4 Pigment DEW-PEARL AH-10 Kakuhachi 80% Dispersant ARLACEL60 10% TWEEN60 10% According to the formula of (4) above, gradually add the pigment while stirring the dispersant, and stir for 1 hour after addition. and complete.

B Preparation of resin liquid Lodin Gum Lodin WW manufactured by Arakawa Hayashisan 30 Alkyd Resin High Rack 111 manufactured by Hitachi Plastics 5% Hytanol 1501 〃 5% Solvent Isopropyl alcohol 20% Isobutyl alcohol 10% Methyl cellosolve 30% First stir the solvent. C. Preparation of ink C-1 A-1 Toner 35% B Resin liquid 40% Ethyl cellosolve 25% Stir at room temperature for about 1 hour. Make ink.

This ink was assembled into a marking pen using a known method, resulting in an opaque white ink.

C-2 A-2 Toner 35%, B resin liquid 40%, and ethyl cellosolve 25% were used to form an ink, and as a result of assembly using a known method, a golden ink was obtained.

C-3 A-3 Toner 30% Varifast Blue 1603 Orient Chemical
An opaque blue ink was obtained by forming an ink using a formulation of 5% B resin liquid and 25% ethyl cellosolve and assembling it by a known method.

C-4 A-4 Toner 30% Variable Stretch 1306 Orient Chemical Co., Ltd.
Ink was formed using a formulation of 5% B resin liquid 40% and ethyl cellosolve 25% and assembled using a known method to obtain an opaque red ink.

C-5 A-1 Toner 30% Varifast Blue 1605 Orient Chemical
2.5% Ospi Yellow RY Orient Chemical Co., Ltd. 2.5% B Resin liquid 40% Ethyl cellosolve 25% Ink was prepared and assembled using a known method to obtain an opaque green ink.

By appropriately selecting the dyes added in addition to the above examples, the hue of the opaque ink can be almost unlimited. In addition, as the amount of dye added is reduced, light pastel colors can also be obtained.

Claims (1)

[Scope of Claims] 1. An organic solvent-based ink for writing instruments, characterized in that the pigment component is a pigment formed by using mica as a substrate and coating the mica with titanium white. 2. An organic solvent-based ink for writing instruments, characterized in that the pigment component is a pigment formed by using mica as a substrate, coating the mica with titanium white, and further coating with iron oxide, Prussian blue, or chromium oxide. Ink for ink absorbers. 3. An organic solvent-based ink for an ink absorber, characterized in that the pigment component is a pigment formed by using mica as a substrate and coating the mica with bismuth oxychloride.