Non-aqueous ink for ball point pen and ball point pen

Details Non-aqueous ink for ball point pen and ball point pen Non-aqueous ink for ball point pen and ball point pen

C - Chemistry, Metallurgy

09

D

C09D 11/18 (2006.01) B43K 7/00 (2006.01) B43L 7/00 (2006.01)

Patent

CA 2158382

A non-aqueous ink for a ball point pen is disclosed herein which is accompanied by the feature of the non- aqueous ink excellent in the so-called cap-off performance that a writing performance does not deteriorate even when the pen is allowed to stand, with a cap being removed, and the feature of an aqueous ink that a low writing pressure can be used and blobbing does not occur. This ink comprises an organic solvent having a vapour pressure of 0.2 mmHg (20°C) or less, a colorant and a coagulant and has a non-Newtonian viscosity index of 0.2 to 0.5 and a viscosity of 200 mPa.s (25°C, 50 rpm) or less. Furthermore, the ink is characterized by containing an autolyophobic vehicle in which a contact angle to the surface of a material such as stainless steel or bronze having a high surface free energy is in the range of 5 to 40°.

Cette invention concerne une encre non aqueuse pour stylo à bille qui ne sèche pas lorsque le stylo est inutilisé pendant un certain temps et laissé sans capuchon, mais qui présente les avantages d'une encre aqueuse, soit la possibilité d'écrire sans avoir appuyer trop fort au risque de faire des taches. Cette encre comprend un solvant organique dont la tension de vapeur est de 0,2 mmHg ou moins à 20 degrés Celsius, un colorant et un épaississeur et a un indice de viscosité non-newtonien de 0,2 à 0,5 et une viscosité d'au plus 200 mPa.s (25 degrés Celsius, 50 tr/min). De plus, cette encre renferme un agent autolyophobe caractérisé par un angle de contact avec une surface telle que de l'acier inoxydable ou du bronze à tension superficielle élevée se situant entre 5 et 40 degrés.

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