An eraser for removing strokes of writing, painting and/or drawing tools, including at least one binder and at least one plasticizer. The eraser includes at least one plasticizer in the form of pentaerythritol tetravalerate.

The present invention provides writing compositions that are capable of being erased or changed in color chemically. The present invention also provides erasing media for erasing or changing the color of marks produced with the writing compositions, as well as writing systems and incorporating the erasing media and the writing compositions. The present invention further provides writing instruments produced using the writing compositions.

Provided are an erasing implement and a writing implement equipped with the erasing implement, the erasing implement being capable of erasing writing regardless of the type of ink or lead of the writing implement, even writing with thermochromic ink or writing with pencil lead. The erasing implement is equipped with a first erasing member for erasing writing with thermochromic ink and a second erasing member for erasing writing of types other than thermochromic ink, and is configured by covering the outer surface of the second erasing member with the first erasing member.

The present invention relates to an eco-friendly eraser using EPDM rubber, and more specifically, to an eraser composition containing EPDM (ethylene-propylene-diene monomer), a plasticizer, and calcium carbonate, and to an eco-friendly eraser containing the same. The present invention can provide an eco-friendly eraser that does not require a vulcanization process, does not use low-molecular-type plasticizers, and has excellent erasing properties, hardness, and color, and can replace PVC erasers.

A writing instrument having a removal function of a handwritten content is provided where a tip erasing body that erases incorrectly written words or pictures is formed on the outer peripheral surface of a lower body, and the tip erasing body and the lower body are formed by a double injection molding method. An integrated one body prevents any form of gap between the tip erasing body and the lower body. Since the tip erasing body is integrally made with the lower body, when a user wants to erase incorrect contents, an unstable state like a conventional product can be overcome.

[Problems] An object of the present invention is to provide: thermochromic color-memory composition which effectively expresses a property of being capable of interchangeably memorizing and retaining colors and is thus applicable to various fields; and thermochromic memory microcapsule pigment encapsulating the same. [Means for Solution] Provided are thermochromic color-memory composition and thermochromic color-memory microcapsule pigment encapsulating the same, the thermochromic color-memory composition comprising: (a) a component composed of an electron-donating color-developing organic compound; (b) a component composed of an electron-accepting compound; and (c) a reaction medium which comprises an ester compound represented by the following Formula (1) and controls color reaction between the components (a) and (b): ##STR00001##
(wherein, R represents an alkyl group having 4 to 22 carbon atoms, a cycloalkylalkyl group having 5 to 12 carbon atoms, a cycloalkyl group having 4 to 8 carbon atoms or an alkenyl group having 4 to 22 carbon atoms; X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a halogen atom; and n represents 0 or 1).

A friction body for discoloring handwriting written with a thermochromic ink with frictional heat, the friction body including a surface portion configured to generate frictional heat when manually rubbed on a porous substrate. The surface portion may have a thermal effusivity of less than about 300 J K.sup.1 m.sup.2 s.sup.1/2.

There is provided a friction body which is adapted to rub a thermochromic image or handwriting formed on a paper surface by use of thermochromic ink to thermally discolor the thermochromic image or handwriting by frictional heat resultant from rubbing, a thermal conductivity of a friction portion of the friction body is set to be within 0.05 W/(m.Math.K) to 50 W/(m.Math.K).

The invention relates to an input device 1 for capacitive touch-sensitive displays, wherein the device is a simple pen 11, wherein the simple pen can be sharpened, wherein the device is present as a core, or wherein the device is present as a core with a coating, or wherein the device is present as a core with a casing, or wherein the device comprises a core, a casing and a coating, wherein the core, the casing and/or the coating are configured to be electrically conductive, wherein an element, a contacting element 12 for a tablet/display is formed at one end of the device, and wherein the contacting element is formed as an electrically conductive material.