Reversibly thermochromic aqueous ink composition for writing utensils, and refill and water-based ballpoint pen each internally containing same

A technology of thermal discoloration and composition, applied in the direction of ballpoint pens, writing utensils, inks, etc., to achieve the effect of inhibiting aggregation and excellent effect

Active Publication Date: 2021-12-10
PILOT PEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to solve the problems in the aqueous ink composition for writing implements containing a reversible thermochromic colorant while improving various characteristics

Method used

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  • Reversibly thermochromic aqueous ink composition for writing utensils, and refill and water-based ballpoint pen each internally containing same
  • Reversibly thermochromic aqueous ink composition for writing utensils, and refill and water-based ballpoint pen each internally containing same
  • Reversibly thermochromic aqueous ink composition for writing utensils, and refill and water-based ballpoint pen each internally containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0324] Hereinafter, the present invention will be described in more detail through examples, but the present invention is not limited by these examples.

[0325] In addition, the average particle diameter of the microcapsule pigment is measured using the above-mentioned laser diffraction / scattering type particle size distribution measuring device (device name: LA-300, manufactured by Horiba Manufacturing Co., Ltd.) Value particle size), the laser diffraction / scattering type particle size distribution measuring device was calibrated based on the value measured by the measuring device using the Coulter method (electrical detection zone method).

preparation example 1

[0326]

[0327] Preparation of reversible thermochromic composition

[0328] A reversible thermochromic microcapsule pigment suspension enclosing a reversible thermochromic composition composed of 2-(2-chloro 4.5 parts of phenylamino)-6-di-n-butylaminofluorane, 4.5 parts of 1,1-bis(4-hydroxyphenyl)-n-decane as an electron-accepting compound (component (b)), and 2,2-bis Composed of 7.5 parts of (4-hydroxyphenyl)hexafluoropropane and 50.0 parts of 4-benzyloxyphenylethyl decanoate as a reaction medium (component (c)). The suspension is centrifuged to isolate the reversible thermochromic microcapsule pigment. Furthermore, the average particle diameter of the microcapsule pigment is 2.5 μm, showing a t 1 : -20°C, t 2 : -9°C, t 3 : 40°C, t 4 : Behavior of the hysteresis characteristic at 57°C and ΔH63°C reversibly changes from black to colorless and from colorless to black.

preparation example 2

[0329]

[0330] A reversible thermochromic microcapsule pigment suspension enclosing a thermochromic color memory composition is obtained. The thermochromic color memory composition consists of 3- 2.0 parts of (4-diethylamino-2-hexyloxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)-4-azaphthalide as an electron-accepting compound 8.0 parts of 2,2-bis(4-hydroxyphenyl)hexafluoropropane (component (b)), 50.0 parts by mass of 4-benzyloxyphenylethyl decanoate as a reaction medium (component (c)) composition. The suspension is centrifuged to isolate the reversible thermochromic microcapsule pigment. The average particle diameter of the microcapsule pigment is 2.3 μm, which shows a t 1 : -14°C, t 2 : -6°C, t 3 : 48°C, t 4 : Behavior of the hysteresis characteristic at 60°C and ΔH64°C reversibly changes from blue to colorless and from colorless to blue.

[0331]

[0332] The following components were formulated and mixed to obtain an ink composition.

[0333] ・Reversible thermochro...

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Abstract

The invention provides: a reversibly thermochromic aqueous ink composition which exhibits excellent writing performance, while being not susceptible to problems such as aggregation of a coloring agent, increase in the composition viscosity and decrease in the handwriting density; and a refill and a water-based ballpoint pen each using this reversibly thermochromic aqueous ink composition. The reversibly thermochromic aqueous ink composition contains a reversibly thermochromic microcapsule pigment enclosed in a microcapsule that is formed of an organic resin, an N-vinyl-2-pyrrolidone polymer, glycerol and water, wherein: if PMC, PPVP and PG are respective content ratios (mass%) of the reversibly thermochromic microcapsule pigment, the N-vinyl-2-pyrrolidone polymer and the glycerol with respect to the total mass of the ink composition, 0.3 <= PMC / (PPVP + PG) <= 4 and 0.2 <= PPVP / PG <= 5 are satisfied. The refill and the water-based ballpoint pen each internally containing this reversibly thermochromic aqueous ink composition are provided.

Description

technical field [0001] The invention relates to a water-based ink composition for a reversible thermochromic writing tool, a replacement refill and a water-based ballpoint pen with the built-in water-based ink composition. In more detail, it relates to a reversible thermochromic property that exhibits large hysteresis characteristics according to temperature changes and exhibits color development and fading, and is interchangable and reversible even after the application of heat or cooling required for discoloration is removed. A water-based ink composition for a reversible thermochromic writing instrument that maintains either a colored state or a faded state, and a refill and a water-based ballpoint pen incorporating the same. Background technique [0002] A reversible thermochromic water-based ink composition for a writing instrument and a writing instrument incorporating it have been proposed in the past, which can form handwriting that can interchangeably memorize and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/106C09D11/17C09D11/18C09D11/50B43K1/08B43K7/01B43K7/02B43K29/02
CPCB43K7/02B43K29/02C09D11/17C09D11/18B43K1/086C09D11/50C09D11/106B43K1/08B43K7/01
Inventor 桝重直登小椋麻美子大野逸香
Owner PILOT PEN CO LTD
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