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Reversibly thermochromic aqueous ink composition, and writing instrument and writing instrument set each utilizing same

A technique for writing implements and compositions, which is applied in the field of writing implements and writing implement kits, and can solve problems such as lightening of handwriting color

Active Publication Date: 2012-07-11
THE PILOT INK CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compounding the above-mentioned polymer coagulant can suppress the aggregation and sedimentation of the microcapsule pigment in a short time, but it is difficult to completely suppress the lightening or darkening of the handwriting color caused by the specific gravity difference between the microcapsule pigment and the carrier for a long time, especially Yes, handwriting sometimes becomes lighter over time in an upright state, or when vibration is applied when transporting or moving in an upright state, the color of the handwriting becomes lighter

Method used

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  • Reversibly thermochromic aqueous ink composition, and writing instrument and writing instrument set each utilizing same
  • Reversibly thermochromic aqueous ink composition, and writing instrument and writing instrument set each utilizing same
  • Reversibly thermochromic aqueous ink composition, and writing instrument and writing instrument set each utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] Preparation of Reversible Thermochromic Microcapsule Pigment

[0189] Obtain a microcapsule pigment suspension containing a reversible thermochromic composition with color memory, said reversible thermochromic composition composed of 1,3-dimethyl-6-diethylamino as component (A) 3.0 parts of fluorane, 3.0 parts of 4,4'-(2-ethylhexane-1,1-diyl)biphenol as component (B), 3.0 parts of 2,2-bis(4'-hydroxyphenyl)- 5.0 parts of hexafluoropropane and 50.0 parts of 4-benzyloxyphenylethyl caprate as a component (C) were formed.

[0190] The aforementioned suspension is centrifuged to separate the reversible thermochromic microcapsule pigment.

[0191] The microcapsule pigment has an average particle size of 2.5 μm, a complete color fading temperature of 60° C., and a complete color development temperature of -20° C., and changes color from orange to colorless due to temperature changes.

[0192] Preparation of reversible thermochromic water-based ink composition

[0193] 25.0 p...

Embodiment 2

[0201] Preparation of Reversible Thermochromic Microcapsule Pigment

[0202] Obtain a microcapsule pigment suspension containing a reversible thermochromic composition with color memory, said reversible thermochromic composition consisting of 2-(dibutylamino)-8-(dipentyl Amino)-4-methyl-spiro[5H-[1]benzopyrano[2,3-g]pyrimidine-5,1'(3'H)-isobenzofuran]-3-one 1.0 Parts, 3.0 parts of 4,4'-(2-ethylhexane-1,1-diyl)biphenol as component (B), 2,2-bis(4'-hydroxyphenyl)-hexafluoropropane 5.0 parts and 50.0 parts of capric acid 4-benzyloxyphenyl ethyl ester as a component (C) were formed.

[0203] The aforementioned suspension is centrifuged to separate the reversible thermochromic microcapsule pigment.

[0204] The microcapsule pigment has an average particle size of 2.3 μm, a complete fading temperature of 58° C., and a complete color development temperature of -20° C., and changes color from pink to colorless due to temperature changes.

[0205] Preparation of reversible thermochr...

Embodiment 3

[0214] Preparation of Reversible Thermochromic Microcapsule Pigment

[0215]Obtain a microcapsule pigment suspension containing a reversible thermochromic composition with color memory, said reversible thermochromic composition composed of 2-(chloroamino)-6-dibutylaminofluorescein as component (A) 4.5 parts of alkane, 3.0 parts of 4,4'-(2-ethylhexane-1,1-diyl)biphenol as component (B), 2,2-bis(4'-hydroxyphenyl)-hexa 5.0 parts of fluoropropane and 50.0 parts of 4-benzyloxyphenylethyl caprate as a component (C) were formed.

[0216] The aforementioned suspension is centrifuged to separate the reversible thermochromic microcapsule pigment.

[0217] The microcapsule pigment has an average particle size of 2.4 μm, a complete color fading temperature of 56° C., and a complete color development temperature of -20° C., and changes color from black to colorless due to temperature changes.

[0218] Preparation of reversible thermochromic water-based ink composition

[0219] 30.0 part...

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Abstract

A reversibly thermochromic aqueous ink composition comprising water, a water-soluble organic solvent, a reversibly thermochromic microcapsule pigment, a comb-shaped polymeric dispersant having a carboxyl group in a side chain thereof, a nitrogen- and sulfur-containing organic compound, and a water-soluble resin, wherein a reversibly thermochromic composition comprising (A) an electron-donating color-developing organic compound, (B) an electron-accepting compound and (C) a reaction medium that determines the temperature at which the color-developing reaction between the components (A) and (B) occurs is encapsulated in the reversibly thermochromic microcapsule pigment; a writing instrument produced using the ink composition; and a writing instrument set comprising the writing instrument and a friction body.

Description

technical field [0001] The present invention relates to a reversible thermochromic water-based ink composition, a writing instrument and a writing instrument set using the same. Background technique [0002] At present, an inner-filling writing instrument has been disclosed, which impregnates the reversible thermochromic water-based ink composition in the ink storage body and accommodates it in the pen barrel. The reversible thermochromic water-based ink composition can form color changes with temperature handwriting that changes (for example, refer to Patent Document 1). [0003] The aforementioned reversible thermochromic water-based ink composition eliminates the following disadvantages: due to the difference in specific gravity between the reversible thermochromic microcapsule pigment and the carrier (vehicle), the reversible thermochromic capsule pigment slowly aggregates and settles in the ink storage body, and due to When the body of the pen is down (inverted state) ...

Claims

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Application Information

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IPC IPC(8): C09D11/16B43K8/02B43K29/02B43K8/03C09D7/45C09D11/00C09D11/17
CPCC09B67/0085C09B67/009B43K8/04C09B67/0097B43L19/0068B43K8/03C09D11/17C09D11/16C09B67/0014C09D7/1291B43K25/022B43K8/02B43K23/126B43K29/02B41M5/305C09D5/26C09D7/70C09D7/45
Inventor 藤田胜幸
Owner THE PILOT INK CO LTD
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