Abstract: The object of the invention is to provide an aqueous coating agent which I applied onto a recording medium in the ink-jet system to form a film excellent in scratch resistance, water resistance and gloss on the surface of an image, and an aqueous coating solution containing this aqueous coating agent.

Abstract: For producing a pressurized ball-point pen refill the ball-point pen refill includes a tip, an ink storage tube and a tail plug, wherein ink is filled in the space of the ink storage tube relatively near to the tip, and a pressuring gas is filled in the space of the ink storage tube relatively far from the tip. The tip includes a ball and a holder, and the ball is formed to have a surface roughness (Ra) of 0.010 ?m to 0.080 ?m. The holder has a ball house and an ink guiding groove, and the ball house has a side part and a bottom part. Moreover, a formula 1.01??B/?A ?1.11 is satisfied when ?A is the diameter of the ball, and ?B is the inner diameter of the side part of the ball house.

Abstract: For producing a pressurized ball-point pen refill in which ink is hard to leak, in which a ball is hard to drop out from a ball house, in which thin spot is hard to occur, in which an excellent initial writing performance is provided, and in which a writable distance is increased sufficiently, the ball-point pen refill 10 includes a tip 20, an ink storage tube 30 and a tail plug 40, wherein ink 80 is filled in the space of the ink storage tube 30 relatively near to the tip 20, and a pressuring gas 90 is filled in the space of the ink storage tube 30 relatively far from the tip 20. The tip 20 includes a ball 50 and a holder 60, and the ball 50 is formed to have a surface roughness (Ra) of 0.010 &mgr;m to 0.080 &mgr;m. The holder 60 has a ball house 61 and an ink guiding groove 62, and the ball house 61 has a side part 70 and a bottom part 71. Moreover, a formula 1.01≦&phgr;B/&phgr;A≦1.