C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 11/18 (2006.01) B43K 1/08 (2006.01) B43K 7/00 (2006.01)
Patent
CA 2196512
A shear-thinning water-based ball-point pen ink composition comprising from 1% by weight to 35% by weight of a colorant, from 2% by weight to 35% by weight of a water-soluble polar solvent, from 1% by weight to 30% by weight of a nonionic surface active agent having an HLB value within the range of from 8 to 12, and the balance being water and adjusting additives, and having a viscosity within the range of from 25 mPa.s to 160 mPa.s (a value at the number of revolution of 100 rpm in an EM type rotational viscometer, 25°C) and a shear thinning index within the range of from 0.1 to 0.6; the nonionic surface active agent having a mixed phase comprising a phase standing dispersed in the form of fine particles and a phase standing dissolved in a molecular state. A method for preparing the ink composition and a ball-point pen employing the ink composition are also disclosed.
Composition aqueuse d'encre à rhéo-fluidification pour stylos à bille. Elle renferme de 1 % à 35 % en poids d'un colorant, de 2 % à 35 % en poids d'un solvant polaire hydrosoluble, de 1 % à 30 % en poids d'un surfactif non ionique avec une valeur HLB de 8 à 12, le reste étant constitué d'eau et d'additifs d'ajustement; la viscosité se situe dans une plage de 25 mPa.s à 160 mPa.s (valeur obtenue à 100 t/min dans un viscosimètre rotatif de type EM, à 25 °C); l'indice de rhéo-fluidification est compris entre 0,1 et 0,6; le surfactif non ionique comporte une phase mixte avec une phase dispersée sous forme de fines particules et une phase dissoute à l'état moléculaire. L'invention présente une méthode pour préparer la composition d'encre et un stylo à bille utilisant ce type de composition.
Kito Tsutomu
Senga Kuniyuki
Macrae & Co.
The Pilot Ink Co. Ltd.
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