JPS629437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a capillary porous material having a large number of fine connecting holes, such as a fiber bundle, as a pen tip, and is sealed to prevent ink from evaporating from the pen tip. Regarding marking pens such as felt-tip pens and oil-based markers.

Conventionally, in marking pens that use capillary porous nibs, such as felt-tip pens and oil-based markers, water and solvent in the ink evaporate from the pen tip, and solid content in the ink aggregates within the pen tip. , hardens, and as a result, the flow path of the ink is blocked, and when consumers start using it, the writing performance deteriorates, such as blurred letters, and the writing quality deteriorates, so-called first-time writing. The deterioration of writing was generally observed, and in severe cases it even became impossible to write.

In order to prevent the ink from drying out from the pen tip, conventional measures have been taken such as improving the ink formulation, examining the materials of the shaft and cap, and improving the fit between the shaft and cap. However, such mechanical measures did not yield sufficient results.

By the way, malfunctions such as deterioration of first-time writing or inability to write due to ink drying from the pen tip are mostly caused by the long period from manufacture to delivery to the consumer, that is, the period during the distribution process. It is rare that the cause is recognized as being unused for a long period of time in the consumer's hands. Therefore, if it is possible to prevent the ink from drying from the tip of the marking pen before it reaches the consumer, there will be almost no problem in practice.

The present invention can, at least, prevent the ink from drying from the nib before it reaches the consumer, and allows the consumer to start using it without any troublesome effort. It is an object of the present invention to provide a marking pen as described above.

The present invention achieves the above object by sealing the pen tip by forming an air-impermeable, easily peelable polymer film on the surface of the pen tip made of a capillary porous material.

Therefore, according to the present invention, the non-breathability of the polymer film prevents the ink from drying from the pen tip before it reaches the consumer, and the ink can be removed before the first stroke is used. Deterioration of properties can be prevented, and due to the easy peelability of the polymer coating, this polymer coating can be easily removed without requiring any troublesome effort during use.

Examples of the present invention will be described below.

Example Bogocoat S-121 (Dainippon Ink & Chemicals Co., Ltd.)
Soak the pen tip in a methyl ethyl ketone-toluene solvent solution of vinyl chloride-vinyl acetate copolymer resin), pull it up, dry it at room temperature, and form a film on the pen tip.
I sealed the pen tip.

The vinyl chloride-vinyl acetate copolymer resin used for this coating is non-porous and easily peelable, and even if a felt-tip pen sealed with this coating is left for three months, the ink does not dry from the tip. It was hardly visible, and when the coating was removed and written on, all products had good initial writing properties.

Example 40 parts of ethylene-vinyl acetate copolymer resin 40 parts of ester gum 20 parts of wax with a melting point of 63°C A film was formed and the pen tip was sealed. In this coating, the ethylene-vinyl acetate copolymer resin was non-porous, and the ester gum and wax were easily peelable, and its performance was generally the same as that described in the above example.

In addition, in this example, a thermoplastic resin, an adhesive resin,
This is an example of a film formed by a hot melt type sealing material, which is a mixed melt of wax and a plasticizer filler added as necessary. for example,
The same effect can be obtained by using a mixed melt of a polyamide resin that provides non-air permeability, gum rosin that provides easy peelability, and a suitable wax.

Example A pen tip was immersed in a synthetic rubber liquid (Califlex) and pulled out, water or solvent was evaporated to form a film on the pen tip, and the pen tip was sealed.

Synthetic rubber (Califlex) used for this coating
was non-porous and easily peelable, and its performance was generally similar to that described in the above examples.

Claims (1)

[Claims] 1. A marking pen characterized in that the nib is sealed by forming a non-porous, easily peelable polymer film on the surface of the nib made of a capillary porous material.