Oil-based ballpoint pen

Abstract

The present invention comprises: an ink-holding tube (2) that holds an ink composition for an oil-based ballpoint pen (10), the ink composition containing a coloring agent, an alkylene glycol alkyl ether, and a polyacrylic acid resin; and a ballpoint pen tip (4) rotatably holding a ball (3) at one end of the extending direction (X) of the ink-holding tube (2). The ratio of the amount of ink consumed (mg) per 100 m of writing distance to the diameter (mm) of the ball (3) is 30 or more.

Claims

1. an ink reservoir containing an ink composition for an oil-based ballpoint pen, the ink composition comprising a colorant, an alkylene glycol alkyl ether, and a polyacrylic acid resin; a ballpoint pen tip that rotatably holds a ball at one end of the ink reservoir in an extending direction; Equipped with The ratio of the ink consumption (mg) per 100 m of writing distance to the ball diameter (mm) is 30 or more; The alkylene glycol alkyl ether is triethylene glycol monomethyl ether. An oil-based ballpoint pen characterized by the above.

2. 2. The oil-based ballpoint pen according to claim 1, wherein the ratio is 150 or less.

3. 3. The oil-based ballpoint pen according to claim 1, wherein the ratio is 65 or more and 100 or less.

4. The oil-based ballpoint pen according to any one of claims 1 to 3, characterized in that the amount of movement of the ball in the extension direction is greater than 3 µm and is not more than 25 µm.

5. 5. The oil-based ballpoint pen according to claim 1, wherein the ink consumption (mg) per 100 m of writing distance is greater than 20 mg and is not more than 100 mg.

6. The alkylene glycol alkyl ether has a solubility parameter (SP value) of 8 (cal / cm ３ ) １／２ Above 13 (cal / cm ３ ) １／２ The oil-based ballpoint pen according to any one of claims 1 to 5, characterized in that:

7. The oil-based ballpoint pen according to any one of claims 1 to 6, characterized in that the ink composition for the oil-based ballpoint pen contains a surfactant.

8. The oil-based ballpoint pen according to any one of claims 1 to 7, characterized in that the ink composition for the oil-based ballpoint pen contains an organic amine.

9. The oil-based ballpoint pen according to any one of claims 1 to 8, characterized in that the ink composition for the oil-based ballpoint pen has a viscosity index n at 20°C of 0.3 or more and 0.7 or less.

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