JP2649570B2 - Method of modifying ink storage body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) Ink is held by capillary force, and at the time of use, this ink is applied to a ballpoint nib, a fiber nib, a resin nib, a brush nib,
Supplying ink to the appropriate nib side such as foam nibs, ink occluding materials used for writing tools such as ballpoint pens, fiber pens, resin pens, brushes, and cosmetics such as eyeliners, eyebrow, lip color etc. It relates to a reforming method.

(Prior art and its problems) As the ink occluding body, various kinds of ink occluding bodies, such as those made of a communicating porous foam, are known. I will describe based on those.

The ink occluding body holds the ink by capillary force,
At the time of use, the ink is supplied to the pen tip side for writing, applying, etc., so the effective ink supply amount (= ink holding amount-ink remaining amount) based on the ink holding amount and the ink remaining amount is actually This has a great effect on the distance of writing and application, and thus on shortening and shortening the life.

Therefore, adjustment is made from various viewpoints such as the material and the density. For example, in terms of material, polyacrylonitrile, polyester, polyethylene, polypropylene, polyethylene terephthalate, or a composite fiber composed of a plurality of resins has been the subject of various studies, and the fiber density,
Fiber diameter, fiber cross-sectional shape, etc. are also subject to adjustment.

However, the life cannot be made sufficient only by these fiber materials and fiber densities.

Therefore, there are some further studies from the viewpoint of various modifications. For example, usually, fibers purchased from a manufacturer are subjected to a surface treatment unique to each company, but further attempts have been made to carry out a surfactant treatment. The reason is that improving the wettability of the fiber surface with the ink increases the effective ink supply amount and extends the life.

However, such an improvement in the wettability with the ink is not so large.

That is, increasing the wettability with the ink certainly increases the ink holding amount, but at the same time increases the remaining amount of the ink, so that only the difference between them is improved.

Accordingly, it is an object of the present invention to further improve the effective ink supply amount and extend the life.

(Means for Solving the Problems) After forming a hydrophobic thin layer on the surface, this thin layer is subjected to an oxidation treatment. That is, the present invention is a method of modifying an ink absorbing body that holds ink by capillary force and supplies the ink to a pen tip side at the time of use, and after forming a hydrophobic thin layer on the surface, The gist of the present invention is a method of modifying an ink occlusion body by oxidizing a thin layer.

 The details will be described below.

In order to form a hydrophobic thin layer, it is easy to make the substance forming the hydrophobic thin layer into a liquid state, apply a treatment such as coating and dipping, and air-dry or otherwise dry. For example, as a substance forming a hydrophobic thin layer, a polysiloxane having a hydrophobic group such as a methyl group, a surfactant such as an aliphatic amide, a titanium-based coupling agent, and the like are appropriately selected, and this is mixed with water or an organic solvent. The ink occlusion body is immersed in the solution and dried. By the way, even if the dilution rate is changed, the characteristics of the obtained ink occlusion body are
Often unaffected.

To oxidize the hydrophobic thin film thus obtained, an appropriate oxidizing agent is used. Preferred are gaseous ones
Highly uniform treatment can be easily performed up to the inside of the ink occluding body. Examples include oxygen, ozone, halogen, and the like. In addition, when a plasma generator that generates ozone is used, the processing time can be extremely short. In many cases, the type of the oxidizing agent and the processing time do not significantly change the characteristics of the ink occluding body. That is, according to the present invention, the process management is often extremely easy.

Various materials as described above can be appropriately selected as the ink occlusion body to be subjected to such a treatment. Further, the structure for exerting the capillary force may be an appropriate structure such as a fiber converging body.

(Example) <Example 1> 6.0 g of 3 denier acrylic fiber having crimping
/ m, bundled with dimethylpolysiloxane solution (Toray Silicone SH200; manufactured by Toray Silicone Co., Ltd.)
% Toluene solution, squeezed out excess liquid through a nozzle with an outlet diameter of φ6.0 mm, further evaporated the toluene, allowed to stand in an ozone atmosphere with a concentration of 50 pphm for 1 hour, and taken out. Was wound with a polyester film so as to have a diameter of 6.5 mm, and this was cut into a length of 100 mm to obtain an ink occluding material.

<Examples 2 to 4> In Example 1, the concentration of the dimethylpolysiloxane solution was changed from 10% to 1% (Example 2), 5% (Example 3), and 15%.
Except having changed to (Example 4), everything was the same as Example 1.

<Examples 5 to 7> In Example 1, the ozone atmosphere concentration was changed from 50 pphm to 25.
Everything was the same as Example 1 except that pphm (Example 5), 75 pphm (Example 6), and 100 pphm (Example 7) were used.

<Example 8> In Example 1, all processes were the same as Example 1 except that a process of placing the device in a plasma generator for 60 seconds was performed instead of the process for one hour in an ozone atmosphere.

<Example 9> In Example 1, except that the ozone atmosphere was changed to a chlorine gas atmosphere, all operations were the same as in Example 1.

<Example 10> Instead of using the dimethylpolysiloxane liquid in Example 1, the fatty acid amide (a kind of surfactant) was used in 0.1%.
All procedures were the same as in Example 1, except that a 5% aqueous solution was used.

<Example 11> The same procedure as in Example 1 was carried out except that a 0.2% methanol solution of tetraisopropylbis (dioctylphosphite) titanate (a type of titanium-based coupling agent) was used instead of using the dimethylpolysiloxane liquid. Same as Example 1.

<Example 12> In the same manner as in Example 1, except that the fiber used was changed from 3-denier acrylic fiber to 4-denier polyester fiber.

<Comparative Example 1> In Example 1, a 3-denier acrylic fiber bundled to a weight of 6.0 g / m without performing treatment with a dimethylpolysiloxane liquid or the like was used, and the outer diameter was φ6.5 mm as it was.
Was wound with a polyester film and cut into a length of 100 mm to obtain an ink occluding material.

<Comparative Example 2> In Example 12, a 4-denier polyester fiber bundled with a basis weight of 6.0 g / m without treatment with a dimethylpolysiloxane solution or the like was used.
The film was wound with a polyester film so as to have a thickness of 5 mm, and this was cut into a length of 100 mm to obtain an ink occlusion body.

<Comparative Example 3> In Example 1, a 0.5% aqueous solution of polyoxyethylene lauryl ether (a type of surfactant) was used instead of using a dimethylpolysiloxane liquid, and after drying, treatment in an ozone atmosphere was performed. Outer diameter is φ6.5m without applying
It was wound with a polyester film so as to have a length of m, and this was cut into a length of 100 mm to obtain an ink occluding material.

Commercially available aqueous black dye ink (viscosity 3.
0cps) and housed in a barrel of a writing instrument. At the front end of the barrel, a polyacetal nib (outer diameter φ0.9mm, length 30mm) with a hemispherical tip is attached and written. Is shown in Table 1. In the table, the writing distance is the length (m) that could be written without writing blur when writing at a weight of 100 g on a high-quality paper at a writing angle of 60 ° and a writing speed of 7 cm / sec. The amount of ink is filled in the ink occluding body in the vertical state, and 80% of the ink amount immediately before the ink is wetted (100% is a small amount of ink. ), And the remaining amount of ink (g) was calculated from the difference in weight between immediately after assembling into a writing instrument and after measuring the writing distance.

(Effects of the Invention) From the above Table 1, the ink amount of each embodiment is not very large, but the amount of ink remaining is extremely small, and the ink supply amount, which is the difference between the two, is large. The writing distance is long. Thus, the use of the ink occluding material obtained according to the present invention results in a product having a long life. In the description, the writing instrument is assembled as a writing instrument, but may be of another type.

Claims (1)

(57) [Claims] 1. A method of modifying an ink-absorbing body which holds ink by capillary force and supplies the ink to a pen tip side at the time of use. A method for modifying an ink occlusion body in which a layer is subjected to an oxidation treatment.