Provided is a liquid storage member for coating tools which successfully reduces plastic consumption and reduces environmental loads, by making use of materials based on paper in place of plastics such as polypropylene that has been used for liquid (e.g., ink) storage members. A liquid storage member for coating tools having at least three layers of a paper base laminate composed of an inner layer made of paper base material, and a middle layer of a metal layer or a silica deposition layer, formed on the outer peripheral side of the inner layer; and an outer layer made of the paper base material formed on the outer peripheral side of the middle layer, wherein the paper base material of the inner layer has a density of 0.8 g/cm.sup.3 or more.

A nib for a valve-free free ink writing felt pen including a first end configured to deliver ink to a writing support and second end, opposite the first end, configured to be inserted in a nib receiving part of the valve-free free ink writing felt pen, the first end and the second end defining an axial direction of the nib, the nib having an external surface configured to cooperate with an internal surface of the nib receiving part, the external surface being configured to allow intake of air from the outside of a free ink tank, the valve-free free ink writing felt pen into the free ink tank and avoid ink leakage outside the free ink tank when cooperating with the internal surface of the nib receiving part. A valve-free free ink writing felt pen including a nib.

A nib for a valve-free free ink writing felt pen including a first end configured to deliver ink to a writing support and second end, opposite the first end, configured to be inserted in a nib receiving part of the valve-free free ink writing felt pen, the first end and the second end defining an axial direction of the nib, the nib having an external surface configured to cooperate with an internal surface of the nib receiving part, the external surface being configured to allow intake of air from the outside of a free ink tank, the valve-free free ink writing felt pen into the free ink tank and avoid ink leakage outside the free ink tank when cooperating with the internal surface of the nib receiving part. A valve-free free ink writing felt pen including a nib.

Provided is a writing instrument including a pen cap, a pen tip and a pen barrel, wherein the pen tip is arranged at one end of the pen barrel, an ink cartridge configured to store ink is formed at the other end of the pen barrel, and the pen cap able to be removed is provided on the pen barrel for covering the pen tip; wherein the writing instrument further includes: an ink delivery assembly including a first tube body, a second tube body, a liquid guiding column and liquid absorbent cotton, wherein the second tube body is inserted into the first tube body, the liquid guiding column is inserted into the second tube body, the liquid absorbent cotton is arranged inside the first tube body, an inner end of the pen tip is inserted into the first tube body, and an end of the first tube body which is away from the pen tip is opened with a first vent and an end of the second tube body which is close to the pen tip is opened with a second vent; the first tube body is arranged in the pen barrel; an air flow channel is formed between an inner wall of the pen barrel and the first tube body; the second tube body is in communication with the ink cartridge; a part of the pen barrel corresponding to where the pen tip is arranged is provided with a plurality of ribs, and an air inlet is enclosed by the pen tip and any two adjacent ribs, and the air inlet is in communication with the air flow channel. The writing instrument could increase ink storage capacity and avoid ink leakage, thereby improving user experience.

Provided is an oil-based ink composition for writing instruments which has good properties for writing on writing surfaces of various materials and which has improved friction resistance against friction from retracing of letters that have already been written and against stronger friction forces.

Provided is an oil-based ink composition for writing instruments which has good properties for writing on writing surfaces of various materials and which has improved friction resistance against friction from retracing of letters that have already been written and against stronger friction forces.

Devices including a marker pen body, a marker cartridge, and a kit having the marker pen body and at least one marker cartridge. The marker pen includes a marker pen body front and a marker pen body rear configured to removably mate with the marker pen body front, the mated marker pen body front and the marker pen body rear forming a cavity having an interior mating means configured to removably mate with a cartridge and prevent rotation of the cartridge in the cavity. The cartridge includes a nib, a marker cartridge housing including an exterior mating means configured to removably mate with a cavity of a marker pen body, such that removably mating the exterior mating means and the cavity is configured to prevent rotation of the marker cartridge housing in the cavity, and a sponge configured to contact the nib inside the marker cartridge housing and transfer ink to the nib.

Devices including a marker pen body, a marker cartridge, and a kit having the marker pen body and at least one marker cartridge. The marker pen includes a marker pen body front and a marker pen body rear configured to removably mate with the marker pen body front, the mated marker pen body front and the marker pen body rear forming a cavity having an interior mating means configured to removably mate with a cartridge and prevent rotation of the cartridge in the cavity. The cartridge includes a nib, a marker cartridge housing including an exterior mating means configured to removably mate with a cavity of a marker pen body, such that removably mating the exterior mating means and the cavity is configured to prevent rotation of the marker cartridge housing in the cavity, and a sponge configured to contact the nib inside the marker cartridge housing and transfer ink to the nib.

An ink reservoir unit for a writing instruments using an ink reservoir tube with which low contamination can be achieved considering environmental problems; and a writing instruments using the same. The ink reservoir tube is composed of a composite material in which a raw material is layered on a paper substrate having paper as a substrate. One end section of the ink reservoir tube is coupled to a connection part formed on a writing member or a relay member that holds the writing member to constitute the ink reservoir unit for a writing instrument. In one preferred aspect, a locking device using a male thread formed on an outer peripheral surface is provided to the connection part to be connected to the ink reservoir tube, and the ink reservoir tube is coupled to the relay member that holds the writing member by the locking device.

Provided is a pen including: an ink reservoir configured to store an ink containing decorative particles; and a pen tip configured to apply the ink to an ink coating target. The pen tip includes: a proximal end to which the ink is supplied from the ink reservoir; a distal end opposite to the proximal end and configured to contact the ink coating target; and a groove opening on the outer circumferential surface of the pen tip and extending from the proximal end to the distal end.