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Erasable ball-point pen ink
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Inventors: Miyajima, Tamotsu; Tanaka, Noriatsu; Saito, Nobuto;
Assignee: Pilot Man-Nen-Hitsu Kabushiki Kaisha (JP)
Primary Examiner: Yarbrough; Amelia B.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak, and Seas
An erasable ball-point pen ink is disclosed. The ink is comprised of a rubber component, a volatile solvent, an organic pigment and a nonvolatile solvent, which additionally contains fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction; a semisolid substance; a soft solid substance having a melting point of not more than 130.degree. C.; a combination of fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction, and a semisolid substance; or a combination of fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction, and a soft solid substance having a melting point not higher than 130.degree. C. The ink can be used in a ball-point pen to make it possible to write fine letters and is capable of maintaining highly stable ink traces over long distances compared with presently available ball-point pen inks. The traces produced are even and show good intensity. Further, the ink does not produce substantial wear of ball holder with respect to the pen components. In addition to the excellent writing performances of the disclosed ink it retains the same or better erasability than erasable inks presently available in the market. |
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DETAILED DESCRIPTION OF THE INVENTION The excellent writing performance described hereinbefore and hereinafter implies that the erasable ball-point pen ink according to the present invention can provide intense and sharp ink trace, etc.
, and does not provide any difficulty owing to troubles in the flow of ink or to wearing of ball holders even after using the ball-point pens employing the ink according to the present invention over a long period of time continuously.
In accordance with the present invention, there is also provided an erasable ball-point pen ink comprising a rubber component, a volatile solvent, an organic pigment and a nonvolatile solvent, which additionally comprises fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction, a semisolid substance and a soft solid substance having a melting point not higher than 130.
degree.
C.
In order to solve the disadvantage (3) mentioned above, there can be used an ink having a reduced viscosity, so as to facilitate the flow of ink.
However, the use of such an ink results in very poor erasabilities, that is, not achieving the requirement (1) mentioned above.
The flow of ink, therefore, must be improved by other means not involving the reduction in the viscosity of ink.
In the present invention, a semisolid substance or a soft solid substance having a melting point not higher than 130.
degree.
C.
can be employed for this purpose.
The use of such substance makes it possible to improve the attachment of ink to the surface of a writing ball and to transfer ink onto the surface of paper in a smoother manner, without any reduction in viscosity of ink.
As a result, satisfactory ink traces can be formed without impairing the erasability of ink traces.
The disadvantage (4) mentioned above can be effectively eliminated in cases where a pigment component consisting entirely or mostly of organic pigments are employed, instead of conventional inorganic pigments
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Semiconductor manufacture 
