Provided is an aqueous ink composition for writing instruments, which enables desired colorfulness to be obtained easily. The aqueous ink composition for writing instruments according to the present invention contains: pigmented microspheres each having a matrix comprising water and a polymer, and a water-insoluble dye; and unpigmented microspheres.

Provided is an aqueous ink composition for writing instruments, which enables desired colorfulness to be obtained easily. The aqueous ink composition for writing instruments according to the present invention contains: pigmented microspheres each having a matrix comprising water and a polymer, and a water-insoluble dye; and unpigmented microspheres.

A refill friendly pen body that is configured to adapt to a refill cartridge of various dimensional parameters. An adjustment cylinder is adjustably carried within a barrel to adapt the pen body to a length of the refill cartridge. A grip end of the pen body is configured with an internal collet to compressively engage with a forward end of the cartridge across to retain the forward end of the cartridge in a writing position. The pen body may also be provided with a cap to selectively cover and uncover the writing tip.

An electronic stylus device includes a stylus tip element having a stylus tip end and an opposing end. The stylus tip element is positioned at an end of the electronic stylus device and aligned along the long center axis of the electronic stylus device. A nutation collar is positioned about the stylus tip element and the long center axis. The nutation collar provides one or more bearing surfaces around the stylus tip element between the stylus tip end and the opposing end of the stylus tip element. The one or more bearing surfaces permit the stylus tip element to nutate within the nutation collar. A deflection sensor is positioned proximate to the opposing end of the stylus tip element on the long center axis and detects lateral deflection of the opposing end of the stylus tip element relative to the long center axis of the electronic stylus device.

A method for manufacturing a ball pen tip in which a spring for biasing a ball is assembled to the ball pen tip, the method including punching the ball pen tip by a punch from a rear end of the ball pen tip along a central axis direction of the ball pen tip to form a plastic flow ridge formed by a plastic flow upheaving radially inward from an inner peripheral wall surface of the ball pen tip to assemble the spring to the ball pen tip by the plastic flow ridge.

A method for manufacturing a ball pen tip in which a spring for biasing a ball is assembled to the ball pen tip, the method including punching the ball pen tip by a punch from a rear end of the ball pen tip along a central axis direction of the ball pen tip to form a plastic flow ridge formed by a plastic flow upheaving radially inward from an inner peripheral wall surface of the ball pen tip to assemble the spring to the ball pen tip by the plastic flow ridge.

Provided is a dispersion liquid of colored resin fine particles for an aqueous ink having excellent stability and a sufficient drawn line intensity; an aqueous ink composition for a writing instrument such as felt-tip pens, marking pens, and ballpoint pens using the dispersion liquid of the colored resin fine particle as a colorant; and a writing instrument loaded with the composition. The dispersion liquid of colored resin fine particles for an aqueous ink includes colored resin fine particles dispersed in water, the colored resin fine particles composed of at least a cyclohexyl (meth)acrylate monomer, and a basic dye or an oil-soluble dye, in which the content of the cyclohexyl (meth)acrylate monomer is 30% by mass or more, and the content of the basic dye or the oil-soluble dye is 15% by mass or more based on the total polymer component constituting the colored resin fine particles.

A pen includes a pen tube, a connection structure, a cap and an elastic unit. The pen tube includes a pen tube case and a thread portion provided at the pen tube case. The connection structure includes a main body, a corresponding thread portion and an elastic unit fastener. The corresponding thread fastener is located at the main body and is for joining with the thread portion. The elastic unit fastener is provided at the main body. The cap includes a cap case and an elastic unit corresponding fastener provided at the cap case. The two ends of the elastic unit are respectively fastened to the elastic unit fastener and the elastic unit corresponding fastener.

A writing, drawing, marking and/or cosmetic device, wherein the device includes at least one shaft and at least one inner body, wherein the at least one shaft is formed from concrete-containing material. The shaft at least partially surrounds the inner body. In the installation position the shaft is secured in an axial direction against axial displacement by a closing cover and a front part and a prestress is formed in the shaft in the axial direction via the closing cover and the front part.

The present invention provides a water-based ink composition for a ballpoint pen that is less likely to cause bleeding of a written trace in writing, provides a favorable written trace without causing no blurring or line splitting, and excels in the storage stability of the ink composition; and a water-based ballpoint pen using the ink composition.

A water-based ink composition for a ballpoint pen comprising water, a coloring agent, a copolymer having a specific structure; and a water-based ballpoint pen using the ink composition.