The disclosure relates to a solvent-free photocrosslinkable writing ink advantageously for a pen, including, as a percentage by weight relative to the total weight of the ink: abetween 40 and 75% of a photocrosslinkable acrylate and/or methacrylate oligomer, bbetween 1 and 55%, optionally, of a photocrosslinkable acrylate and/or methacrylate monomer, cbetween 0.5 and 6% of a photoinitiator, dbetween 1 and 10% of a dye, advantageously a basic dye, and ebetween 0 and 10% of an additive. The present disclosure further relates to a method for securing a writing medium using the ink, the crosslinked ink obtained by crosslinking the ink and a pen for photocrosslinkable ink including the ink.

The present invention provides an aqueous dry-erasable ink or marking composition, which could be applied to both porous and non-porous surfaces and erasable from both porous and non-porous surfaces or marking substrates. The present invention further provides erasure of mark made by the ink composition from such porous and non-porous substrate, which is achieved by a cloth or the like, without requiring rubbing by conventional erasers. The ink composition comprises water, composite pigment, one or more rheology additive, one or more wetting agent, one or more water-soluble resin, pH adjuster and one or more biocide. The composite pigment is a compound of polymer resin and colored pigment at a weight ratio from 10/90 to 97/3.

The present invention provides an aqueous dry-erasable ink or marking composition, which could be applied to both porous and non-porous surfaces and erasable from both porous and non-porous surfaces or marking substrates. The present invention further provides erasure of mark made by the ink composition from such porous and non-porous substrate, which is achieved by a cloth or the like, without requiring rubbing by conventional erasers. The ink composition comprises water, composite pigment, one or more rheology additive, one or more wetting agent, one or more water-soluble resin, pH adjuster and one or more biocide. The composite pigment is a compound of polymer resin and colored pigment at a weight ratio from 10/90 to 97/3.

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.

This disclosure describes manufacture of mixture and use of same to fabricate a respective electronic device. In one embodiment, the mixture includes: perovskite oxide particles and a solvent. The solvent is a water-soluble liquid such as ethylene glycol. A combination of the perovskite oxide particles and the solvent are mixed for subsequent fabrication (such as via a printing head of a printer) of an electronic device.

A novel dispersant contains a specific acetylene glycol and/or a specific acetylene glycol ethoxylate in combination with a specific arylphenol compound. Even when added in a small amount, the dispersant rapidly disperses disperse dyes and pigments and moreover exhibits excellent wettability and antifoaming properties. Dispersions and ink compositions containing the dispersant are also disclosed.

A novel dispersant contains a specific acetylene glycol and/or a specific acetylene glycol ethoxylate in combination with a specific arylphenol compound. Even when added in a small amount, the dispersant rapidly disperses disperse dyes and pigments and moreover exhibits excellent wettability and antifoaming properties. Dispersions and ink compositions containing the dispersant are also disclosed.

A writing, marking and/or drawing liquid, more particularly an aqueous, pigmented and/or water-blendable writing, marking and/or drawing liquid, is provided for capillary systems, more particularly for applicator implements having a capillary system. The liquid has a viscosity of less than 40 mPas, more particularly less than 10 mPas (Brookfield, 20 C., cone-plate CPE-40) and includes an aqueous pigment preparation, a binder, a base, and a dispersing wetting agent. The dispersing wetting agent includes an aqueous solution of a modified polymer having groups with pigment affinity. An applicator implement in which a writing, marking or drawing liquid of this kind is used is also provided.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.