Abstract: A writing implement including a plurality of component parts A, B, C, etc. is satisfactory in balance and stability during writing operations and can be smoothly handled for minute, reciprocating, turning motions during writing operations. The writing implement including the component parts A, B, C etc. has its center of gravity in a part thereof between a position at 20 mm from the tip of a projected writing element and a position corresponding to the middle of the overall length thereof, and the weight of the part thereof between the position at 20 mm from the tip of the projected writing element and the position corresponding to the middle of the overall length is not less than 50% of the total weight of the writing implement.

Abstract: A writing implement provided with a strong clip is simple in construction and is provided with a coil spring restrained from easily falling off. The writing implement (1, 11, 21) includes a tubular body (2), a clip (3), a pillar (7) formed on the outer surface of the tubular body, a connecting structure R connecting the clip and the pillar, a coil spring (4) extended between the inner surface of the clip and the tubular body and capable of loading the clip such that a front end part (3aa) of the inner surface of the clip is pressed elastically against the outer surface of the tubular body, and a projection (5) formed on the outer surface of the tubular body so as to project toward the clip and fitted in the coil spring. Preferably, the clip is provided with a back wall (10) projecting from a back part (3ab) of the inner surface (3a) of the clip and the coil spring is disposed on the front side of the back wall. The projection (5) has a height not smaller than half the length of the coil spring.

Abstract: Disclosed is a water based ink composition for a rollerball pen that includes at a least colorant, a water-soluble organic solvent, water, a shear thinning viscosity property-providing agent, a lubricant, and a bubble suppressant. The ink composition includes a phosphate-ester based surfactant having a structure of general formula 1 as the lubricant, and an erythorbic acid or a derivative thereof as the bubble suppressant (n represents an integer of 1 or more, R represents an alkyl group having carbon numbers of 12 to 15, and R? represents H or R—(C2H4O)n—).

Abstract: The present invention relates to a rotating retractable writing instrument, which is constituted in a simpler way and can thrust a mouthpiece and a writing core element smoothly to positions ready for writing. The writing instrument by the present invention comprises a rear outer cylinder 2, an inner sheath 4 unrotatably accommodated in the rear outer cylinder 2, a front outer cylinder 10 from which a mouthpiece 12 and a writing core element 13 can be thrust. A protrusion 45 for restraining rotating range, a refill sliding cam 42 and a mouthpiece sliding cam 43 are formed in the inner sheath 4. A refill sliding element 6 and a mouthpiece sliding element 7 are accommodated in the inner sheath 4. The mouthpiece sliding element 7 is connected to the refill sliding element 6. Further a connecting element 9 is connected to the inner sheath 4.

Abstract: A reversal magnetic display panel where the numbers of writes/erases repeated until the micro magnets in a dispersion liquid sealed in multiple small cells formed between substrates sediment in the lower part of the small cells by repeated writes/erases when the reversal magnetic display panel is used in a vertical position are increased and a favorable display/erase performance is achieved. Between substrates, a dispersion liquid containing a dispersion medium and a thickening agent as main components and further containing micro magnets the both sides of each of which are differently colored are sealed in. Writing is constituted by difference in contrast between the color of the reversed micro magnets and the color of the non-reversed ones. Hollow particles are mixed with the micro magnets so as to reduce the ratio of the specific gravity of the micro magnets to that of the liquid. The residual magnetization per unit mass of the micro magnets is 1.0 to 23.

Abstract: In order to obtain an ink for oil-based ballpoint pens and an oil-based ballpoint pen which are excellent in handwriting sharpness, handwriting dryness, handwriting and feeling of writing, an ink composition includes an oil-soluble dye, water, an organic solvent whose vapor pressure at 20° C. is 0.5 mmHg or more and which dissolves the water, and an organic solvent whose vapor pressure at 20° C. is 0.1 mmHg or less and which dissolves the organic solvent whose vapor pressure at 20° C. is 0.5 mmHg or more. A total of these three components is 20 to 75% by mass based on an entire mass of the ink composition. A content of the water is 3.0 to 15.0% by mass based on the entire mass of the ink composition. An ink viscosity at 20° C. is 100 to 5,000 mPa·s. The water and the other components are formulated, mixed and stirred to produce the ink. A ballpoint pen refill with low vapor permeability is used.

Abstract: A ballpoint pen including: an ink accommodation cylinder; a ballpoint pen tip in which a ball is rotatably held, the pen tip being attached to a tip end of an ink-accommodation cylinder directly or through a tip holder; and ballpoint oil-based ink comprising at least a coloring agent, organic solvent, a lubricant comprising organic acid and phosphoric ester, and organic amine, the ink having ink viscosity at shearing speed 6.8 sec?1 of 500 to 6000 mPa·s (20° C.) and directly being accommodated in the ink-accommodation cylinder, wherein the ballpoint pen satisfies 2.5×10?3?Z?1.0×10?3 where ink amount per 1 mm2 is Z mg/mm2 which is calculated from Y=X×105×Z where writing width of the ballpoint pen is X mm and ink consumption per 100 m is Y mg.

Abstract: In a magnetic display panel that changes the display using a magnet, a polychrom display panel is obtained that can magnetically display two colors in addition to the background, specifically, that can magnetically display three colors. The magnetic migration and reversal display panel encloses at least a dispersion liquid obtained by dispersing micro-magnets with differently colored magnetic poles in a dispersion medium containing a colorant.

Abstract: Disclosed is a ballpoint pen including: an ink accommodation cylinder; a ballpoint pen tip in which a ball is rotatably held, the pen tip being attached to a tip end of an ink-accommodation cylinder directly or through a tip holder; and ballpoint oil-based ink comprising at least a coloring agent, organic solvent, a lubricant comprising organic acid and phosphoric ester, and organic amine, the ink having ink viscosity at shearing speed 6.8 sec?1 of 500 to 6000 mPa·s (20° C.) and directly being accommodated in the ink-accommodation cylinder, wherein the ballpoint pen satisfies 2.5×10?3?Z?1.0×10?3 where ink amount per 1 mm2 is Z mg/mm2 which is calculated from Y=X×105×Z where writing width of the ballpoint pen is X mm and ink consumption per 100 m is Y mg.