An aqueous peelable ink composition substrate comprising: (a) at least one film-forming elastomeric polymer, (b) at least one anionic surfactant, (c) at least one coloring agent, and (d) water, wherein the film-forming elastomeric polymer is acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR), and a method for preparing such an aqueous peelable ink composition.

Provided is a thermochromic writing instrument, including thermochromic ink; and a friction unit configured to cause handwriting in the thermochromic ink to undergo a thermochromic change by frictional heat. The thermochromic ink includes a metallic luster pigment added thereto. The thermochromic writing instrument is provided with an attachment hole to attach the friction unit. The friction unit includes an attachment portion to be inserted into the attachment hole and a friction portion in a convex curved surface shape projecting from the attachment hole. The friction portion has a volume Ve and the metallic luster pigment has a volume Vp, the volume Ve and the volume Vp satisfying 5 □ Ve/Vp □ 35, the friction portion 32 has a maximum outer diameter D and a projection length L, the diameter D and the length L satisfying 0.1 □ L/D □ 1.5, and a material for the friction unit 3 has a value of Shore A hardness in accordance with JIS K 7215 of Japan Industrial Standard measured immediately after starting contact with an indenter in a range of 60 or more and 85 or less and has a value (ΔHS) of the Shore A hardness defined by a following equation of 0 or more and less than 5, ΔHS=(Shore A Hardness Value immediately after Starting Contact with Indenter)−(Shore A Hardness Value 15 seconds after Starting Contact with Indenter).

An aqueous peelable ink composition with color-changing comprises: at least one film-forming elastomeric polymer, at least one polyoxyethylene sorbitan ester, at least one dye, at least one pigment, and water, wherein the film-forming elastomeric polymer (a) is acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR).

An aqueous peelable ink composition with color-changing comprises: at least one film-forming elastomeric polymer, at least one polyoxyethylene sorbitan ester, at least one dye, at least one pigment, and water, wherein the film-forming elastomeric polymer (a) is acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR).

A thermochromic writing instrument, comprising: 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 further includes a friction unit, 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 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.

A thermochromic writing instrument, comprising: 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 further includes a friction unit, 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 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.

A print method includes a) applying an activator composition onto a recording medium, the activator composition comprising a photoinitiator; b) applying an inkjet ink composition onto the recording medium, the inkjet ink composition comprising a curable monomer and a gellant, the inkjet ink composition comprising no photo initiator or comprising a photo initiator in an amount of 1.0 wt % or less, based on the total amount of the ink composition; and c) curing the ink and the activator composition. Step c is started within a time period of 2 s-1000 s after applying the ink composition onto the recording medium. an ink set comprising an activator composition and an inkjet ink composition, a software product, and an inkjet printing apparatus are also disclosed.

A print method includes a) applying an activator composition onto a recording medium, the activator composition comprising a photoinitiator; b) applying an inkjet ink composition onto the recording medium, the inkjet ink composition comprising a curable monomer and a gellant, the inkjet ink composition comprising no photo initiator or comprising a photo initiator in an amount of 1.0 wt % or less, based on the total amount of the ink composition; and c) curing the ink and the activator composition. Step c is started within a time period of 2 s-1000 s after applying the ink composition onto the recording medium. an ink set comprising an activator composition and an inkjet ink composition, a software product, and an inkjet printing apparatus are also disclosed.

The present disclosure relates to a process to produce aqueous dispersions of graphene stabilized by cellulose, offering an alternative to the current methods of dispersion of graphene. The present process provides the advantages that it uses biodegradable cellulose compatible with the environment and can be used in industrial processes in alkaline medium or in the absence of alkali; and when graphene is stabilized with cellulose in alkaline medium it becomes unstable when in contact with natural waters, thus precipitating and being easily removed or concentrated. In other embodiments, solids obtained by drying of the dispersions, once dried, can be redispersed in aqueous alkaline solution.

The present disclosure relates to a process to produce aqueous dispersions of graphene stabilized by cellulose, offering an alternative to the current methods of dispersion of graphene. The present process provides the advantages that it uses biodegradable cellulose compatible with the environment and can be used in industrial processes in alkaline medium or in the absence of alkali; and when graphene is stabilized with cellulose in alkaline medium it becomes unstable when in contact with natural waters, thus precipitating and being easily removed or concentrated. In other embodiments, solids obtained by drying of the dispersions, once dried, can be redispersed in aqueous alkaline solution.