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 ...