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Water-based ink composition for writing instruments

A writing tool and water-based ink technology, applied in writing utensils, inks, applications, etc., can solve problems such as poor writing, unsatisfactory dry-out resistance, and increased viscosity

Active Publication Date: 2021-08-13
MITSUBISHI PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned Patent Document 1, it is concerned that the dry-out resistance performance is still unsatisfactory and easily causes poor writing such as blurring
In the above-mentioned Patent Document 2, the non-drying property is definitely improved by compounding ethylene oxide-modified polyvinyl alcohol, but there is a problem that aggregates of ink may be generated in some cases at the beginning of writing after the cap is removed. problems with clot formation
At the same time, it also involves the problem of viscosity increase over time

Method used

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  • Water-based ink composition for writing instruments
  • Water-based ink composition for writing instruments
  • Water-based ink composition for writing instruments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 9 and comparative example 1 to 5

[0067] Each aqueous ink composition for writing instruments was prepared according to the compounding composition shown in Table 1 below.

[0068] Thermochromic microcapsule pigments 1 and 2 as resin particles used as colorants in Examples 1 and 2 were obtained by Production Examples 1 and 2 below.

manufacture example 1

[0069] Production Example 1: Thermochromic Microcapsule Pigment 1

[0070] First, 1 part by mass of ETAC manufactured by Yamada Chemical Co., Ltd. as a leuco dye, 2 parts by mass of bisphenol A as a developer, and 24 parts by mass of myristate as a thermochromic temperature control agent Myristyl was heated and melted at 100° C. to obtain 27 parts by mass of a homogeneous composition. Hereinafter, "parts by mass" are simply referred to as "parts".

[0071] Then, 10 parts of isocyanate and 10 parts of polyol were added as a microcapsule filming agent to 27 parts of the homogeneous hot melt of the composition obtained above, and stirred and mixed. Next, the composition was emulsified at 25°C by using 60 parts of a 12% aqueous solution of polyvinyl alcohol as a protective colloid to prepare a dispersion liquid. Then, the dispersion liquid was treated by using 5 parts of 5% polyamine at 80° C. for 60 minutes, thereby obtaining microcapsules having a core-shell structure.

manufacture example 2

[0072] Production Example 2: Thermochromic Microcapsule Pigment 2

[0073] Similarly, 1 part of dye RED520 manufactured by Yamada Chemical Co., Ltd. as a leuco dye, 2 parts of 4,4'-(2-ethylhexylidene) bisphenol as a developer, and 24 parts 4,4'-(hexafluoroisopropylidene)bisphenol dimyristate as a thermochromic temperature control agent was heated and melted at 100° C. to obtain 27 parts of a homogeneous composition.

[0074] Then, 27 parts or more of the homogeneous hot melt of the composition obtained was gradually added to Gantlet AN by adding 40 parts of methyl vinyl ether·maleic anhydride copolymer resin manufactured by ISP Co., Ltd. as a protective colloid. -179 was dissolved in water in 100 parts of an aqueous solution at 90°C prepared while being neutralized with NaOH, and the mixture was dispersed in the form of oil droplets having a diameter of about 0.5 to 1.0 μm while heating and stirring. Then, 20 parts of melamine resin manufactured by Sumitomo Chemical Co., Lt...

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Abstract

The present invention provides a water-based ink composition for writing instruments, which includes at least 5 mass % or more of resin particles with a volume basis median diameter D50 of 0.3 μm or more and 0.05 to 10 mass % of butylene glycol·ethylene. Alcohol copolymer, wherein the aqueous ink composition is excellent in drying resistance without reducing the dispersion stability of the resin particles, and the aqueous ink composition is suitable for writing instruments such as water-based ink ballpoint pens and markers.

Description

technical field [0001] The present invention relates to an aqueous ink composition for writing implements suitable for writing implements such as aqueous ink ballpoint pens, which is excellent in writing properties and dryup resistance without reducing the dispersion stability of resin particles. Background technique [0002] Hitherto, aqueous ink compositions for writing instruments have been compounded with resin particles in specific cases for the purpose of imparting specific functions to the ink compositions. When the writing instrument filled with the above-mentioned ink was left to stand in a state where the cap was removed, it was observed that the writing instrument tended to easily suffer from a decrease in dischargeability of the ink due to dryup, and deterioration of the dispersion stability of the particles The resulting changes in physical properties such as viscosity and deterioration of writing properties. Changes in physical properties and deterioration in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/18C09D11/16C09D11/17
CPCC09D11/16C09D11/17C09D11/18B43K7/00C09D11/50
Inventor 佐藤健司早川刚史小椋孝介
Owner MITSUBISHI PENCIL CO LTD
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