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Reversible thermochromic aqueous ink composition and writing instrument using same

A technology for writing instruments and compositions, applied in writing instruments, household appliances, inks, etc., can solve the problems of easy pigment sedimentation, reduced ink discharge, low viscosity, etc., and achieve the effect of excellent dispersion stability

Active Publication Date: 2020-06-09
PILOT PEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an ink composition tends to lower its viscosity when vibration is applied from the outside, so when a pigment with a large specific gravity is used, the pigment tends to settle, and the viscosity cannot be lowered unless external force is applied. When used in writing instruments such as marker pens and signature pens, where ink is discharged by capillary force, the ink discharge performance may decrease, and improvement is desired.

Method used

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  • Reversible thermochromic aqueous ink composition and writing instrument using same
  • Reversible thermochromic aqueous ink composition and writing instrument using same
  • Reversible thermochromic aqueous ink composition and writing instrument using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0268] Preparation of microcapsule pigments

[0269] A microcapsule pigment suspension containing a color-memory reversible thermochromic composition composed of 3',6'-bis[phenyl(3- Methylphenyl)amino]-spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one 3.00 parts, 4-4'-[2, 5.00 parts of 2,2-trifluoro-1-(trifluoromethyl)ethylene]biphenyl, 3.00 parts of 4-4'-(2-ethylhexylidene)bisphenol, cyclohexyl group as component (c) Consists of 50.00 parts of methyl-4-biphenylacetate.

[0270] The suspension is centrifuged to isolate the microcapsule pigments.

[0271] The average particle size of the microcapsule pigment is 1.9 μm, the complete decolorization temperature is 61-62°C, the complete color development temperature is -20°C, and changes from blue to colorless by temperature change.

[0272] Preparation of ink composition

[0273] 0.40 parts of polymer coagulant (hydroxyethyl cellulose, trade name CELLOSIZE EP-09, manufactured by Dow Chemikaru Japan Co., Ltd.), 0.40 parts of acr...

Embodiment 2

[0285] Preparation of microcapsule pigments

[0286] A microcapsule pigment suspension containing a color-memory reversible thermochromic composition composed of 3',6'-bis[phenyl(3- Methylphenyl)amino]-spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one 3.00 parts, 4-4'-[2, 5.00 parts of 2,2-trifluoro-1-(trifluoromethyl)ethylidene]biphenol, 3.00 parts of 4-4'-(2-ethylhexylene)biphenol, 2- Consists of 50.00 parts of [4-(phenylmethoxy)phenyl]ethyl decanoate.

[0287] The suspension is centrifuged to isolate the microcapsule pigments.

[0288] The average particle size of the microcapsule pigment is 1.9 μm, the complete decolorization temperature is 60°C, and the complete color development temperature is -20°C. It changes from blue to colorless by temperature change.

[0289] Preparation of ink composition

[0290] 0.40 parts of polymer coagulant (hydroxyethyl cellulose, trade name CELLOSIZE EP-09, manufactured by Dow Chemikaru Japan Co., Ltd.), 0.40 parts of acrylic polymer dis...

Embodiment 3

[0301] Preparation of microcapsule pigments

[0302] A microcapsule pigment suspension containing a color-memory reversible thermochromic composition composed of 6'-(diphenylamino)-2'- [(3-(trifluoromethyl)phenyl)-(dipentylamino)-2'-[(3-(trifluoromethyl)phenyl)amino]-spiro[isobenzofuran-1(3H ), 6.00 parts of 9'-(9H)xanthene]-3-one, 4-4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylene as component (b) ] 6.00 parts of biphenol, 4.00 parts of 4-4'-(2-ethylhexylidene) bisphenol, and 50.00 parts of cyclohexylmethyl-4-biphenylacetate as component (c).

[0303] The suspension is centrifuged to isolate the microcapsule pigments.

[0304] The average particle size of the microcapsule pigment is 1.9 μm, the complete decolorization temperature is 61-62°C, the complete color development temperature is -20°C, and changes from green to colorless through temperature changes.

[0305] Preparation of ink composition

[0306] 0.40 parts of polymer coagulant (hydroxyethyl cellulose, trade name ...

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Abstract

To provide a reversible thermochromic aqueous ink composition that exhibits excellent dispersion stability of a reversible thermochromic microcapsule pigment; and a writing instrument using same. A reversible thermochromic aqueous ink composition that contains: a reversible thermochromic microcapsule pigment which is obtained by microencapsulating a reversible thermochromic composition containing(a) an electron-donating color-developing organic compound, (b) an electron-receiving compound, and (c) a reaction medium that determines the temperature at which a color-developing reaction between the component (a) and the component (b) takes place; and a vehicle that contains water and a specific gravity-adjusting agent selected from the group consisting of oxyacids of group 6 elements having atomic weights of 90-185 and salts thereof.

Description

technical field [0001] The invention relates to a reversible thermochromic water-based ink composition. More specifically, the present invention relates to a reversible thermochromic aqueous ink composition excellent in storage stability and ink color-developing properties. Moreover, this invention also relates to the writing instrument using this composition. Background technique [0002] Ink compositions for writing implements using pigments as colorants have been actively researched because they can obtain a color tone excellent in vividness. Among them, ink compositions using reversible thermochromic microcapsule pigments can express color according to temperature. Different colors are therefore applied to various writing instruments. (for example, Patent Document 1) [0003] Patent Document 1 describes an ink composition for writing instruments using a reversible thermochromic microcapsule pigment, water, a polymer coagulant, and a writing instrument using the ink co...

Claims

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Application Information

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IPC IPC(8): C09D11/17B43K8/02B43K29/02
CPCB43K8/02B43K29/02C09D11/17C09D11/50B43K8/026
Inventor 藤田胜幸神户靖章三田真之山村知之
Owner PILOT PEN CO LTD
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