JPS6274699A - Synthetic resin nib - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a synthetic resin pen nib whose outer periphery is coated with metal.

(Prior art) In order to improve abrasion resistance, to withstand 1 strong writing pressure, or to improve appearance gloss9, for example, Japanese Utility Model Application No. 48-75059 discloses [both ends ``A writing instrument pen with an ink flow hole penetrating the surface and a metal coating layer on the side surface'' was published in Utility Model Publication No. 57-81184.
The publication states, ``In a known synthetic resin nib that has an ink flow passage in the nib body that penetrates in the axial direction and expands radially in the circumferential direction, all or part of the outer peripheral surface of the nib. Depositing, painting, plating, printing, and coating a thin film with metallic luster on
``A pen nib of a writing instrument in which the four rods are brought into close contact by a method such as coating or the like'' are disclosed.

(Problems to be Solved by the Invention) Regardless of the quality characteristics aimed at, such as abrasion resistance, strong writing pressure resistance, or glossy appearance, it is surprisingly difficult to obtain the desired quality characteristics at present.

It is difficult to improve the adhesion between the base material synthetic resin and the metal coating to a degree that allows long-term use. That is, in general, it is said that it is possible to coat polycarbonate, polyethylene terephthalate, polyamide, polypropylene, polyacetal, ABS resin, etc. with metal coatings with good adhesion, along with improvements in various surface treatment technologies. However, when writing, the pen tip is subjected to intense micro-vibration and bending stress, as well as abrasion force from the writing surface, so it can be said that the metal coating is basically in a state where it is extremely easy to peel off. Requirements for maintaining the shape of the ink passage and size of the pen tip often do not allow for conditions that would normally be possible during surface treatment. For example, synthetic resins containing dispersed carbon fibers or glass fibers as fillers can provide metal coating with better adhesion than those without dispersed fillers, but those containing a large amount of dispersed fillers can achieve desired results. Pen nibs with ink passages can no longer be used.

Furthermore, if various vapor deposition methods such as ion blating and sputtering, which are said to be able to coat various metals with good adhesion for various purposes, are employed under conditions that are normally considered optimal, problems such as deformation may occur. It also happens.

Yet again. Even if the entire surface of the nib is coated with metal.

Abrasion or micro-peeling of the metal film due to writing exposes the synthetic resin part, causing wear of the synthetic resin part, but if the synthetic resin itself lacks wear resistance,
When writing, the metal coating not only gets caught on the writing surface, but also makes the writing taste bad, and also promotes peeling of the metal coating. Of course, this is true when metal coating is applied so that the writing contact portion of the pen tip is originally coated with synthetic resin.

(Failure to solve the problem) The present inventors investigated a large number of synthetic resins, and also.

After repeated experiments, it was finally discovered that by using polyetheretherketone, a pen nib with satisfactory quality characteristics could be obtained. That is, the gist of the present invention is a synthetic resin pen nib whose outer periphery is coated with metal, characterized in that the synthetic resin as a base material of the nib is polyether ether ketone.

It doesn't take much effort to make polyetheretherketone into a pen tip shape. Since it has a high melting point, it is only necessary to adjust the temperature conditions, and by molding methods such as extrusion and injection, it can be made into pen nibs of appropriate shapes such as rods and plates. Similar to conventional general nib materials such as polyacetal and polyamide, it can be drawn and stretched for diameter reduction after extrusion molding. Further, if the amount is not large enough, the filler can be dispersed and contained.

Polyetheretherketone is used as the nib base material, and this is coated with metal by painting, non-chemical plating, vapor deposition, or other methods.

The advantages of the present invention are particularly exhibited when vapor deposition is used. This is because it can sufficiently withstand the thermal conditions during vapor deposition required to improve adhesion. Examples of metals to be coated include chromium, nickel, titanium, aluminum, molybdenum, tungsten, silicon, nitrides and carbides thereof, and alloys such as stainless steel. When aiming to improve abrasion resistance and strong writing pressure resistance, elemental chromium, titanium, or chromium nitride is one of the preferred materials, and when improving the appearance gloss, relatively soft materials such as nickel or aluminum are preferred. A single metal is one of the preferable ones. Of course, it is also possible to combine them because they can be coated in multiple layers. The thickness of the film to be formed is also 9. For example, when aiming to improve strong writing pressure resistance, the thickness is 1 to 10.
It is better to have a relatively thick layer of about .mu.m, but a thickness of 0.1 .mu.m or less is sufficient if only to improve the appearance glossiness. Further, the portion to be covered may be part or all of the pen tip as appropriate. That is.

It has better wear resistance than conventional polyacetal pen nibs. It is advisable to heat-treat the mark at 200°C or higher.

(Example) Example 1 VICTREX PEEK450G (
Polyetheretherketone (manufactured by Imperial Chemical Industries, Ltd.) was extruded using a screw set extruder (a die with a discharge hole diameter of 3Qmm having an ink passage pattern at the tip) was taken out and taken out. A cylindrical object with a length of 551 m and a length of 35
After cutting into rum, it was heat-treated at 300°C for 50 minutes in an air atmosphere, and then 5 μm of chromium was added using a high-frequency magnetron sputtering device under the conditions of vacuum attainment of 2 x 10-4 Pa, argon pressure of 3 x 10 Pa, 1 force of 300 W, and a chromium target. It was coated and the end was shaped into a hemispherical shape to form a pen nib.

Example 2 Everything was the same as in Example 1 except that the chromium target was replaced with a nickel target.

Comparative Example 1> A cylindrical object obtained in the same manner as in Example 1 was cut into a length of 35 mm using Gelaco Yuio-01 (polyacetal manufactured by Polyplastic Co., Ltd.).

Using the sputtering equipment used in Example 1,
10 Pa + 'It power 200W, 5μm of chromium coated under the conditions of chromium target, below.

A pen nib was prepared in the same manner as in Example 1. Here, the conditions for sputtering treatment were different from those in Example 1.

This is because the shape of the columnar object could not be maintained sufficiently under the conditions of Example 1.

Comparative Example 2 The same procedure as Comparative Example 1 was carried out except that the chromium target was replaced with a nickel target.

Comparative Example 3.4> Example 1. Comparative Examples 3 and 4 were prepared in the same manner as in Example 1 and Comparative Example 1 except that the sputtering treatment was not performed in Comparative Example 1.

(Effect of the invention) Of the six types of pen nibs obtained on each side, the four types that were subjected to sputtering treatment all had a beautiful metallic luster.
Moreover, upon inspection, it appeared that the metal was coated with good adhesion.

However, when these six types of pen nibs are assembled into a writing instrument (the length of the tip/tip protruding from the pen nib holder is set to 1.0 mm) and pressed against a spring scale at an angle of 60 degrees, they bend. When the approximate value of was measured, the results shown in Table 1-1 were obtained.

Table-1 That is, Examples 1 and 2 and Comparative Example 3. Ratio example 1゜2 and comparative example 4. Comparing the differences in the measured values, Example 1.
It was found that, compared to Comparative Examples 1 and 2, Comparative Examples 2 and 2 had less improvement in writing pressure resistance due to the metal coating. In addition, when we conducted a 200m vertical writing test on writing instruments with four types of sputtering-treated pen nibs at a load of 100g and a writing speed of 7α/sec, the results were as shown in Table 2, and those of Comparative Examples 1 and 2 were gold. Peeling of the trianium dermis was observed, and when the same writing pressure resistance test as above was carried out, the measured value was almost the same as that obtained in Comparative Example 4. On the other hand, there was almost no difference from Example 1°. In fact, it tasted a little better (this is thought to be due to the pen tip protruding length being shortened by the slight wear on the pen tip due to the written test).

Table 2 Thus 9 The synthetic resin pen nib of the present invention can be a pen nib with extremely good quality characteristics.

Claims (1)

[Claims] A synthetic resin pen nib whose outer periphery is coated with metal, characterized in that a synthetic resin as a base material of the nib is polyether ether ketone.