JPS5896597A - Method of sealing pen point of aqueous ball pen - 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] The present invention is a water-based ink that uses water as the main solvent. This invention relates to a method for sealing the tip of a so-called aqueous ballpoint pen.

Conventionally, in order to improve storage stability from the time a pen is manufactured until it is used, a synthetic resin coating is formed on the tip of the nib that holds the ball. Cover and seal including the exposed ball part, and reduce the amount of ink evaporation from the tip part? known to prevent.

The method involves dipping the tip of the pen in a solution of synthetic resin in an organic solvent and pulling it up, and then evaporating the solvent at room temperature or heating it to form a synthetic resin coating and sealing.

However, such a method is unsuitable for a water-based ballpoint pen using water-based ink containing water as the main solvent, and cannot obtain sufficient effects.

That is, in this method, a liquid prepared by dissolving a synthetic resin in an organic solvent is used for sealing, but ballpoint pens using water-based ink have poor compatibility with the liquid because the ball surface is wet with the water-based ink. Therefore, on the part of the ball wetted with ink, the synthetic resin is precipitated in the form of fluff, or numerous pinholes are formed, resulting in whitening and no continuous film is formed. This portion may fall off due to a small impact, making it impossible to obtain a sufficient sealing effect. In addition, the sealing effect varies widely,
The drawback is that ballpoint pens of uniform quality cannot be obtained. The present invention has been developed as a result of various studies to solve these drawbacks. By using a synthetic resin emulsion, it is possible to form a uniform synthetic resin coating that blends well with the ball part, completely sealing the tip of the pen tip and preventing ink from evaporating. It prevents weight loss and improves storage stability from manufacture to use in the hands of consumers, and the synthetic resin coating can be easily peeled off by applying pen pressure or by fingers, etc. We have discovered a pen nib sealing method suitable for water-based ballpoint pens.

That is, the gist of the present invention is a method for sealing the nib of an aqueous ballpoint pen, which is characterized by immersing the tip of a pen nib capable of holding one ball in a synthetic resin emulsion and pulling it up.

The synthetic resin emulsions used in the present invention include thermoplastic acrylic emulsions, thermo-self-crosslinking acrylic emulsions, modified acrylic emulsions, heat-reactive acrylic emulsions and other acrylic emulsions, polyvinyl acetate emulsions, modified vinyl acetate emulsions, etc. Polyolefin resin emulsions such as vinyl acetate emulsions, polyethylene emulsions, polypropylene emulsions, various synthetic resin emulsions such as polyvinylidene chloride, copolymer emulsions of vinyl acetate and ethylene, copolymer emulsions of vinyl acetate and acrylic esters, acrylics. Examples include copolymer emulsions of various synthetic resins, such as copolymer emulsions of acid esters and styrene.

These synthetic resin emulsions can be used alone or in combination of two or more.

The synthetic resin emulsion can be used by adding water as appropriate to adjust the viscosity in order to obtain a predetermined film thickness, or by adding a water-soluble resin solution such as polyvinyl alcohol to improve dispersion stability or workability. O Also, from the point of view of workability and economy, the minimum film forming temperature is 5℃.
The following are desirable. If the difference between the film forming temperature and the working temperature or drying temperature is 10° C. or less, the time required to dry the emulsion becomes long and the workability decreases. Also, the synthetic resin coating may become stained with ink.

Further, synthetic resin coatings made of polyolefin resin emulsions and polyvinylidene chloride emulsions are effective in suppressing ink evaporation, but their strength is low, so it is desirable to use them in double or more double layered layers.

Examples of the present invention will be described below.

Example 1 The tip of a water-based ballpoint pen was immersed in an acrylic emulsion (trade name: Movinyl 710 manufactured by Hoechst Synthesis) and pulled up, left at room temperature for 15 hours, and the emulsion adhering well to the tip was dried. A synthetic resin film was formed to seal the pen tip.

The resulting synthetic resin coating forms a uniform coating even on the ball part and adheres closely to the pen tip, completely sealing the pen without peeling off due to vibrations during transportation and preventing evaporation of ink. Satisfactory storage stability was obtained.

The coating could be used by applying writing pressure to the pen tip or by easily peeling it off with a finger or the like.

In addition, variations in the storage stability of water-based ballpoint pens sealed with such a film were extremely small, and water-based ballpoint pens of uniform quality could be obtained. A synthetic resin film was formed and sealed using a method similar to that of the first example.

Example 3 10 parts by weight of acrylic emulsion [trade name: Movinyl 747 manufactured by Hoechst Synthesis] was added to polyvinyl alcohol [manufactured by Hoechst Synthesis].
Mix 2 parts by weight of a 20% aqueous solution of Popal 117 (trade name, manufactured by Kuraray), dip the tip of the pen tip in the mixture, pull it out, leave it at room temperature for 16 hours, cure it at 70°C for 1 hour, and dry it. A synthetic resin film was formed to seal the pen tip.

Example 4 The first example was followed using a mixture obtained by mixing 50 parts of an acrylic emulsion [trade name: Movinyl 710 manufactured by Hoechst Synthesis ■] and a vinyl acetate emulsion [trade name Movinyl 116 manufactured by Hoechst Synthesis ■]. A synthetic resin film was formed and sealed using this method.

Example 5 Example 1 was used as the first step, and as a second step, the tip of the pen nib obtained in the first step was immersed in a polypropylene emulsion (trade name: High-Tech E433N manufactured by Toho Kagaku 14IJ) and pulled out at room temperature. It was left to dry for 10 hours to form a double synthetic resin film and seal the pen tip.

Example 6 Example 1 was used as the first step, and a vinylidene chloride emulsion [trade name Saran Latex L-100] was prepared as the second step.
[manufactured by Asahi Dow]] was used in the same manner as in Example 5 to form a double layer of synthetic resin coating to seal the pen tip.

Claims (1)

[Claims] A method for sealing the tip of a ballpoint pen by pulling up the tip of a pen that can hold a ball into a resin emulsion and adhering to the tip.