JP2630458B2 - Writing implement tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a brush tip made of a fiber bundle of animal hair, acrylic, nylon, or the like, and more specifically, ink containing ink directly in a barrel or in a cartridge. The present invention relates to a writing tip of a writing implement such as a type, a type in which a liquid occluding body is incorporated, and the liquid occluding body is made to absorb ink, and a type in which a writing tip is attached to ink for writing.

(Conventional technology and its problems) Conventionally, the tip of a writing implement made of a fiber bundle of animal hair, acrylic, nylon, or the like, is used at the time of shipping, at the time of display at a store, etc., for maintaining the beauty of the appearance, or externally. Under the force, in order to prevent adverse effects on the handwriting caused by bending or bending of the fiber of the brush tip, by impregnating the brush tip with an aqueous solution containing cloth laver, or an aqueous solution containing polyethylene glycol or glycerin, and performing a drying process, It is known to solidify the brush tip.

These aqueous solutions are used because, when the brush tip is hardened, it is easy to shape the brush tip, and when the first brush is applied, the ink flow is smooth and the brush tip becomes soft. That is, when the ink is supplied to the brush tip at the time of the first brush stroke, cloth laver, polyethylene glycol and glycerin are dissolved in the ink, so that the ink flow is smooth and the brush tip is easily softened.

However, there is a problem that the dissolution of cloth laver, polyethylene glycol, and glycerin in the ink increases the viscosity of the ink and causes blurring at the time of first writing.

The problem is to obtain a writing implement that is easy to shape, that the ink is circulated smoothly at the first writing, that the softening of the writing tip is easy, and that does not cause blurring.

(Means for Solving the Problems) That is, the present invention relates to a writing implement of a writing implement which is treated with an aqueous solution containing an alkali salt of a styrene acrylic resin having a weight average molecular weight of 2,000 to 30,000 with respect to the total amount of the aqueous solution in an amount of 0.01 to 20% by weight. A second aspect of the present invention is that a writing tip of a writing implement in which the aqueous solution of the first aspect contains cloth laver is used.

 Hereinafter, the present invention will be described in detail.

Specific examples of the alkali salt of the styrene acrylic resin include a sodium salt, a calcium salt, a hydroxyamine salt, a potassium salt, and an ammonium salt of the styrene acrylic resin. These are the fiber material and shape of the brush point,
One type or two or more types are appropriately selected and used depending on the ink permeability, the type of the ink, or the application. The amount used is 0.01 to 20% by weight based on the total amount of the aqueous solution, which is 0.1% by weight.
If the amount is less than 01% by weight, the tip becomes difficult to shape, and if the amount is more than 20% by weight, the tip becomes too hard and the ink does not flow smoothly (the ink penetration speed becomes poor).

As the slurylene acrylic resin, a resin which is an alternating copolymer is preferable. If the weight average molecular weight is 2,000 to 30,000, if it is smaller than 2,000, it is difficult to shape the brush tip,
If it is larger than 000, it becomes difficult to dissolve in water, and the brush tip cannot be shaped.

Further, the reason why the above-mentioned alkaline salt aqueous solution contains cloth laver is to make it easier to shape the brush tip and to smooth the writing at the time of the first writing.

In addition, the use of cloth laver is such that the total amount of the styrene acrylic resin and the alkali salt is 0.01 to 20% by weight based on the total amount of the aqueous solution.
It is preferred that If it is less than 0.01% by weight, it may be difficult to shape the brush tip, and 20% by weight
This is because if the amount is larger, the distribution of the ink will not be smooth. Further, the mixing ratio with the alkali salt of the styrene acrylic resin is as follows:
It is preferable that the cloth is laver = 1: 1 to 4: 1.
This is because if the amount of cloth laver decreases, it may be difficult to shape the brush tip, and if the cloth laver increases, the amount of cloth laver dissolved in the ink increases, the viscosity increases, and fog may occur.

As a specific method for treating the brush tip with the aqueous solution, the brush tip may be impregnated with the aqueous solution by immersing the brush tip in the aqueous solution, or spraying the brush tip with the aqueous solution, and then drying.

(Operation) The alkali salt of styrene acrylic resin is hardly dissolved in water after drying, and since the amount dissolved in the ink is small, it prevents the viscosity of the ink from increasing.

Furthermore, the combined use of the cloth seaweed makes it easier to shape the brush tip without excessively hardening the brush tip.

(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples. In the examples and comparative examples, “%” indicates “% by weight”.

Example 1 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 0.03% of a sodium salt of a styrene acrylic resin (weight average molecular weight: 15,000) and shaped. , Leave it indoors (25 ° C) for 12 hours,
After drying, the same structure as that of Pentel brush was obtained to obtain a writing instrument.

Example 2 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 1.0% of a potassium salt of a styrene acrylic resin (weight average molecular weight: 15,000) and shaped. After being left in a room (25 ° C.) for 12 hours and dried, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Example 3 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 14.0% of a potassium salt of a styrene acrylic resin (weight average molecular weight 3,500) and shaped. After being left in a room (25 ° C.) for 12 hours and dried, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Example 4 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 8.0% of an ammonium salt of a styrene acrylic resin (weight average molecular weight 2,800) and shaped. , Leave it indoors (25 ° C) for 12 hours,
After drying, the same structure as that of Pentel brush was obtained to obtain a writing instrument.

Example 5 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 0.02% of a sodium salt of a styrene acrylic resin (weight average molecular weight: 28,000) and shaped. , Leave it indoors (25 ° C) for 12 hours,
After drying, the same structure as that of Pentel brush was obtained to obtain a writing instrument.

Example 6 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was prepared by using sodium salt of styrene acrylic resin (weight average molecular weight 10,000) 0.1% and cloth laver 0.1%
Immersed in an aqueous solution containing
After leaving for a while and drying, it has the same structure as Pentel brush,
I got a writing instrument.

Example 7 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was prepared by using 0.1% calcium salt of styrene acrylic resin (weight average molecular weight 7,500) and 0.1% of cloth laver.
Immersed in an aqueous solution containing
After leaving for a while and drying, it has the same structure as Pentel brush,
I got a writing instrument.

Example 8 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was prepared by using a hydroxyamine salt of styrene acrylic resin (weight average molecular weight: 5,000) 0.1% and a cloth laver
Immerse in an aqueous solution containing 0.05%, shape, and indoor (25
C) for 12 hours, and after drying, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Example 9 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was prepared by using 1.0% ammonium salt of styrene acrylic resin (weight average molecular weight 7,000) and 1.0% of seaweed.
% In an aqueous solution containing
After leaving it to dry for 12 hours, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Example 10 A brush similar to the brush used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was treated with 8.0% calcium salt of styrene acrylic resin (weight average molecular weight 4,000) and 8.0% of cloth seaweed.
Immersed in an aqueous solution containing
After leaving for a while and drying, it has the same structure as Pentel brush,
I got a writing instrument.

Example 11 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 0.4% of potassium salt of styrene acrylic resin (weight average molecular weight 7,000) and 0.4% of cloth laver. Then, after shaping, left in a room (25 ° C.) for 12 hours and dried, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Comparative Example 1 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 25.0% of cloth for laver, shaped, and left in a room (25 ° C.) for 12 hours. After drying, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Comparative Example 2 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 0.003% of seaweed, shaped, and left in a room (25 ° C.) for 12 hours. ,
After drying, the same structure as that of Pentel brush was obtained to obtain a writing instrument.

Comparative Example 3 A brush tip similar to that used for a pen brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 30.0% of an ammonium salt of a styrene acrylic resin (weight average molecular weight 1,000) and shaped. After being left in a room (25 ° C.) for 12 hours and dried, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Comparative Example 4 A brush tip similar to the brush tip used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was prepared by using a sodium salt of styrene acrylic resin (weight average molecular weight: 18,000) 0.003%, cloth seaweed 0.0
Immerse in an aqueous solution containing 03%, shape, and indoor (25 ° C)
For 12 hours, and after drying, the same structure as that of Pentel brush was obtained to obtain a writing implement.

Comparative Example 5 A brush tip similar to that used for Pentel brush (GFK, manufactured by Pentel Co., Ltd.) was immersed in an aqueous solution containing 1.0% of potassium salt of styrene acrylic resin (weight average molecular weight 1,200) and 0.1% of cloth laver. Then, after shaping, left in a room (25 ° C.) for 12 hours and dried, the same structure as that of Pentel brush was obtained to obtain a writing implement.

(Effects) The writing tool obtained in each of Examples 1 to 11 and Comparative Examples 1 to 5 was used to judge the shaping properties of the writing tip, to visually determine the initial brush fray, and to check the ink penetration rate by visually checking the ink penetration into the writing tip after installing the cartridge. The result of measuring the time until it was recognized in Table 1 is shown in the table below.

As described above, according to the present invention, it is possible to obtain a writing tool tip that is easy to shape the writing tip, allows the ink to flow smoothly at the first writing, softens the writing tip, and does not cause blurring.

Claims (2)

(57) [Claims] (1) An alkali salt of a styrene acrylic resin having a weight average molecular weight of 2,000 to 30,000 is added in an amount of 0.01 to the total amount of the aqueous solution.
The tip of a writing implement treated with an aqueous solution containing up to 20% by weight. 2. The writing tip of the writing implement according to claim 1, wherein the writing implement contains cloth laver.