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Water-based ink composition for writing instrument

A technology for writing instruments and water-based inks, applied in writing instruments, inks, applications, etc., can solve problems such as writing feeling and fluidity deterioration, and achieve the effect of excellent line quality and low viscosity

Active Publication Date: 2016-05-18
MITSUBISHI PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current situation is that each of the thickening / gelling agents disclosed in the above Patent Documents 1 to 3 has to be added to the composition in a large amount in order for particles such as pigments to exhibit storage stability; Gelling agent involves problems of deterioration of writing feeling and fluidity

Method used

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  • Water-based ink composition for writing instrument
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Examples

Experimental program
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Effect test

Embodiment 1 to 5 and comparative example 1 to 9

[0086] Oxidized cellulose having the following physical properties was used in accordance with the compounding composition shown in Table 1 below to prepare a predetermined amount of each aqueous ink composition for writing implements by appropriately changing the stirring conditions (shearing force, pressure and stirring time) while mixing and stirring the components by means of a wet method of a high-pressure wet medium micronization device (NanoVater, manufactured by Yoshida Kikai Co., Ltd.); and filtering through a 10 μm bag filter. The pH value of the aqueous ink composition for each writing instrument was measured at 25°C by means of a pH meter (manufactured by HORIBA, Ltd.) to find that the aqueous ink composition fell within the range of 7.9 to 8.2.

[0087] The aqueous ink compositions for writing instruments obtained in Examples 1 to 5 and Comparative Examples 1 to 9 were used to measure viscosity values ​​by the following method.

[0088] When measuring the viscosit...

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Abstract

Provided is a water-based ink composition for a writing instrument, having excellent writing properties over time, line quality, and storage stability of particles while having a low viscosity, in comparison with a conventional thickening / gelling agent such as xanthan gum. The water-based ink composition for a writing instrument is characterized by containing oxidized cellulose in the amount of 0.05-1.5% by mass and having an intrinsic viscosity of 10 mPa.s or less derived by the Casson equation.

Description

technical field [0001] The present invention relates to an aqueous ink composition for writing implements which, compared with conventional thickening / gelling agents such as xanthan gum showing thixotropy, exhibits low viscosity in particles such as pigments, etc. It is excellent in storage stability, writing property over time, and drawing quality. Background technique [0002] Natural compounds, semi-synthetic compounds obtained by chemical modification of natural compounds, and synthetic compounds chemically synthesized from petrochemical raw materials have hitherto been known as thickening / gelling agents showing thixotropy for ink compositions for writing instruments . [0003] For example, known are: an ink composition for an aqueous ink ballpoint pen, characterized in that it contains 0.20 to 0.45% by weight of xanthan gum as a natural thickening / gelling agent (refer to, for example, Patent Document 1); an aqueous ink composition , which is characterized in that it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/16B43K8/02
CPCB43K7/00B43K8/02C09D11/16B43K8/024C09D11/14
Inventor 西岛千裕坂根范子竹内容治
Owner MITSUBISHI PENCIL CO LTD