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Ink composition for water-based ballpoint pen, and water-based ballpoint pen including same

A composition and ballpoint pen technology, applied in ballpoint pens, inks, applications, etc., can solve the problems of hollow handwriting and white writing, and achieve the effects of improved permeability, improved storage stability, and improved dryness of handwriting

Active Publication Date: 2020-06-09
PILOT PEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if a cross-linked acrylic polymer known as a shear viscosity-reducing agent is used in the past, the cross-linked part is chemically bonded, so the viscosity of the ink when standing still can be made high, but the viscosity becomes low due to shear force. The viscosity of the ink cannot be lowered below a certain value due to the influence of the cross-linking portion during chemicalization. Therefore, when the water-based ink composition for writing is used for a writing instrument, the so-called broken line in which the handwriting becomes white or the handwriting becomes hollow sometimes occurs. , expected to improve

Method used

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  • Ink composition for water-based ballpoint pen, and water-based ballpoint pen including same
  • Ink composition for water-based ballpoint pen, and water-based ballpoint pen including same
  • Ink composition for water-based ballpoint pen, and water-based ballpoint pen including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

[0120]

[0121] An ink composition was obtained by combining the composition and method described below.

[0122] (ink composition)

[0123]

[0124] Colorant, water, water-soluble organic solvent, pH adjuster, lubricant, rust inhibitor, and preservative are heated and stirred by a disperser to produce a base ink. Then, while heating the above-prepared base ink, the copolymer was added and mixed sufficiently using a homogenizer stirrer until it became uniform, thereby obtaining the ink composition of Example 1. The ink viscosity of the obtained ink composition was measured at a shear rate of 1.92 sec in an environment of 20° C. -1 The viscosity was measured under the condition of (speed of rotation 0.5rpm), and the result was 2778mPa·s, at a shear rate of 192sec -1 The viscosity of the ink was measured under the condition of (50 rpm rotation...

Embodiment 2～25

[0126] Except having changed the ink composition into the composition shown in Tables 1-3, it carried out similarly to Example 1, and obtained the ink composition.

Embodiment 26～31

[0170] Except having changed the ink composition into the composition shown in Table 4, it carried out similarly to Example 1, and obtained the ink composition.

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PUM

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Abstract

To provide: an ink composition for water-based ballpoint pens which, when used in writing, gives satisfactory handwriting less apt to suffer ink running and free from blurring or line splitting and and which has excellent storage stability; and a water-based ballpoint pen including the ink composition. An ink composition for water-based ballpoint pens which comprises water, a colorant, and a copolymer having a specific structure; and a water-based ballpoint pen which includes the ink composition.

Description

technical field [0001] The present invention relates to an ink composition for an aqueous ballpoint pen and an aqueous ballpoint pen. In more detail, it is related with the ink composition for water-based ballpoint pens excellent in writing performance, and it is related with a water-based ballpoint pen. Background technique [0002] Conventionally, ink compositions for water-based ballpoint pens using a cross-linked acrylic polymer as a shear viscosity-reducing agent have been disclosed (for example, Patent Documents 1 to 3). [0003] This kind of ink has a high viscosity when standing without applying shear stress, and it is stably maintained in the mechanism. When writing, the high shear force generated by the high-speed rotation of the ball reduces the viscosity of the ink near the ball. As a result, the ink is discharged from the gap between the ball and the ball housing and transferred to the paper surface. When the ink transferred to the paper surface is released fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/18B43K7/00
CPCB43K7/00C09D11/18C09D11/17
Inventor 户冢太郎
Owner PILOT PEN CO LTD
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