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WRITING INSTRUMENT FOR FORMING THERMOCHROMIC HANDWRITING

Номер патента: US20190047318A1. Автор: Kajiwara Takumi, MASUSHIGE Naoto. Владелец: . Дата публикации: 14-02-2019.
A writing instrument excellent in handwriting density and temporal stability. The writing instrument includes a ball-point pen tip attached to the front end portion of the ink storage cylinder; and a ball-point pen refill having an ink composition for a writing instrument loaded therein. The ink composition for the writing instrument is a thermochromic ink containing at least a thermochromic microcapsule pigment. The writing instrument includes a pressurization mechanism for applying a pressure to the back end of the ink composition for the writing instrument. 1. A writing instrument characterized by comprising: an ink storage cylinder having an ink composition for a writing instrument comprising a reversible thermochromic microcapsule pigment loaded therein; and a ball-point pen refill including a ball-point pen tip attached to the front end portion of said ink storage cylinder , wherein the writing instrument further having a pressurization mechanism that applies pressure from the rear end side of said ink storage cylinder to said ink composition for a writing instrument.2. The writing instrument according to claim 1 , wherein the handwriting density of a handwriting formed during pressurization by said pressurization mechanism is 0.7 to 1.5.3. The writing instrument according to claim 1 , wherein the ink consumption per 10 m achieved during pressurization by said pressurization mechanism is 1.3 times or more as compared with that during non-pressurization.4. The writing instrument according to claim 1 , wherein the ink viscosity of said ink composition for a writing instrument is 600 mPa·s to 2000 mPa·s claim 1 , at 20° C. and at a shear rate of 3.84 sec; and 10 mPa·s to 100 mPa·s at a shear rate of 384 sec.5. The writing instrument according to claim 1 , wherein the pressure applied to said ink composition for a writing instrument is 1 time or more and 1.5 times or less the atmospheric pressure.6. The writing instrument according to claim 1 , wherein the ...

REVERSIBLY THERMOCHROMIC COMPOSITION, REVERSIBLY THERMOCHROMIC MICROCAPSULE PIGMENT ENCAPSULATING REVERSIBLY THERMOCHROMIC COMPOSITION, AND WRITING INSTRUMENT USING REVERSIBLY THERMOCHROMIC MICROCAPSULE PIGMENT

Номер патента: US20220169919A1. Автор: MASUSHIGE Naoto, MORIGAKI Yui, UMEMOTO Hiroshi. Владелец: . Дата публикации: 02-06-2022.
[Problems] Provided are a highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same. 4. The reversibly thermochromic composition according to claim 2 , whereinna is 0, 1, or 2,{'sup': 'a', 'each Xis independently a linear or branched alkyl group having 1 to 8 carbon atoms or a group represented by the formula (ia),'}{'sup': 'a', 'each Yis independently a halogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms, and'}{'sup': 'a', 'Zis a halogen atom.'}5. The reversibly thermochromic composition according to claim 2 , wherein Xs are different from each other.6. The reversibly thermochromic composition according to claim 2 , wherein{'sup': 'a', 'one of Xs is a linear or branched alkyl group having 1 to 8 carbon atoms,'}the other is the group represented by the formula (ia).7. The reversibly thermochromic composition according to claim 3 , whereinnb is 0, 1, or 2,{'sup': 'b1', 'Xis a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms,'}{'sup': b2', 'b1', 'b2, 'Xis a linear or branched alkyl group having 1 to 6 carbon atoms, provided that the total number of carbon atoms of Xand Xis 4 to 16, and'}{'sup': 'b', 'each Yis independently a halogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms.'}8. The reversibly thermochromic composition according to claim 3 , wherein the total number of carbon atoms of Xand Xis 4 to 12.9. A reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition according to .10. A reversibly thermochromic liquid composition comprising the reversibly thermochromic microcapsule pigment according to and a vehicle.11. The ...

WRITING INSTRUMENT

Номер патента: US20150298488A1. Автор: MASUDA Hirotaka, MASUSHIGE Naoto. Владелец: . Дата публикации: 22-10-2015.
[Problem to be Solved] Provided is a writing instrument, in which stable writing performance can be maintained for a long term, and a feeling of writing and handwriting are favorable. 1. A writing instrument comprising:a pen point retaining member;a pen point that comprises a ball and a ball holding portion that rotatably holds the ball, and is attached to a first end of the pen point retaining member;an ink tank that is attached to a second end of the pen point retaining member; andan ink for a writing instrument that is accommodated in the ink tank and comprises a lubricating interface layer-forming compound,wherein a carbonaceous film is formed on at least one of a surface of the ball or a contact portion of the ball holding portion with the ball; and the carbonaceous film comprises a carbon atom and an oxygen atom bound to the carbon atom.2. The writing instrument according to claim 1 , wherein the carbonaceous film is formed on both of the surface of the ball and the contact portion of the ball holding portion with the ball.3. The writing instrument according to claim 1 , wherein the ball is selected from the group consisting of metals claim 1 , ceramics claim 1 , and alloys thereof.4. The writing instrument according to claim 1 , wherein a proportion of an spcarbon-carbon bond to an spcarbon-carbon bond claim 1 , contained in the carbonaceous film claim 1 , is 0.3 or more.5. The writing instrument according to claim 4 , wherein a rate of a bond containing oxygen to the total bond of carbon contained in the carbonaceous film is 0.1 or more and 0.5 or less.6. The ball-point pen according to claim 1 , wherein the carbonaceous film is formed on the surface of the ball or the contact portion of the ball holding portion with the ball via an intermediate layer; and the intermediate layer comprises carbon and silicon.7. The writing instrument according to claim 1 , wherein the ink tank is attached releasably.8. The writing instrument according to claim 1 , wherein the ...

Reversible thermochromic composition, reversible thermochromic microcapsule pigment comprising same, and writing instrument using same

Номер патента: EP3950068A1. Автор: Hiroshi Umemoto, Naoto MASUSHIGE, Yui Morigaki. Владелец: Pilot Corp, Pilot Ink Co Ltd. Дата публикации: 09-02-2022.
[Problems] Provided are a highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same. [Solution] Disclosed are a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.

Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

Номер патента: US20230398807A1. Автор: Naoto MASUSHIGE, Takumi Kajiwara. Владелец: Pilot Corp. Дата публикации: 14-12-2023.
A ballpoint pen tip comprises: a ball having a diameter of 0.5 mm or less; and a tip body, wherein the tip body has a ball holding chamber, a rear hole, an ink flow hole, and an ink flow groove opening to the ball holding chamber, and not reaching the rear hole. A ratio of an ink consumption per 100 m of handwriting to a diameter of the ball is 200 mg/mm or more and 800 mg/mm or less, and when a front end of the ink flow groove is set as a start point and a position of 0.3 mm rearward from the front end of the ink flow hole is set as an end point, a volume of a first space in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm 3 or more.

Reversibly thermochromic composition and reversibly thermochromic microcapsule pigment encapsulating the same

Номер патента: US20230383175A1. Автор: Hiroshi Umemoto, Kaori MAEHASHI, Naoto MASUSHIGE, Yui Morigaki. Владелец: Pilot Corp, Pilot Ink Co Ltd. Дата публикации: 30-11-2023.
[Problems] To provide a reversibly thermochromic composition having excellent contrast between a colored state and a decolored state, and excellent light resistance, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.[Solution] Disclosed is a reversibly thermochromic composition including: (a) an electron-donating color-developing organic compound; (b) a combination of a compound having a specific structure as an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.

筆記具

Номер патента: JP2013173318A. Автор: Hirotaka Masuda, Naoto MASUSHIGE, 田 博 考 益, 重 直 登 桝. Владелец: Pilot Corp. Дата публикации: 05-09-2013.
【課題】長期にわたり安定した筆記性能を維持でき、筆感及び筆跡が良好である筆記具の提供。 【解決手段】ペン先保持部材と、前記ペン先保持部材の一端に取り付けられたペン先と、前記ペン先保持部材の他端に取り付けられたインキタンクと、前記インキタンクに収容された筆記具用インキを具備してなる筆記具。ここで、前記インキは潤滑界面層形成性化合物を含んでなり、また前記ボール表面、または前記ボール抱持部の前記ボールとの接触部分の少なくとも一方に炭素質膜が形成されている。 【選択図】図1

Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

Номер патента: US11975560B2. Автор: Naoto MASUSHIGE, Takumi Kajiwara. Владелец: Pilot Corp. Дата публикации: 07-05-2024.
A ballpoint pen tip comprises: a ball having a diameter of 0.5 mm or less; and a tip body, wherein the tip body has a ball holding chamber, a rear hole, an ink flow hole, and an ink flow groove opening to the ball holding chamber, and not reaching the rear hole. A ratio of an ink consumption per 100 m of handwriting to a diameter of the ball is 200 mg/mm or more and 800 mg/mm or less, and when a front end of the ink flow groove is set as a start point and a position of 0.3 mm rearward from the front end of the ink flow hole is set as an end point, a volume of a first space in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm3 or more.

Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

Номер патента: EP4245560A4. Автор: Naoto MASUSHIGE, Takumi Kajiwara. Владелец: Pilot Corp. Дата публикации: 27-03-2024.

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

Номер патента: EP3954745A1. Автор: Itsuka Ohno, Mamiko Ogura, Naoto MASUSHIGE. Владелец: Pilot Corp. Дата публикации: 16-02-2022.
Provided are a reversibly thermochromic aqueous ink composition having excellent writability and few problems such as aggregation of a colorant, an increase in viscosity of the composition, or a decrease in handwriting density, and a refill or an aqueous ballpoint pen using the reversibly thermochromic aqueous ink composition. A reversibly thermochromic composition is a reversibly thermochromic aqueous ink composition containing a reversibly thermochromic microcapsule pigment encapsulated in a microcapsule formed from an organic resin, an N-vinyl-2-pyrrolidone polymer, glycerin, and water, in which when contents (% by mass) of the reversibly thermochromic microcapsule pigment, the N-vinyl-2-pyrrolidone polymer, and the glycerin with respect to a total mass of the ink composition are P MC , P PVP , and P G , respectively, 0.3 ≤ P MC /(P PVP + P G ) ≤ 4, and 0.2 ≤ P PVP /P G ^ 5, and a refill or an aqueous ballpoint pen incorporating the reversibly thermochromic aqueous ink composition.
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