Patent ID: 7316841

Claim:
An eraser for erasing information, comprising: a skeleton structure constituted by a skeleton portion and a void portion; and an eraser-base material filled in the void portion, wherein the skeleton portion of the skeleton structure is constituted by a porous structural material of organic polymer consisting of melamine-based resin, the skeleton portion of the skeleton structure has an average thickness from 1 μm to 100 μm, and the void portion of the skeleton structure has an average pore size of 20 μm to 3 mm, the eraser base material is selected from the group consisting of (a) a plastic-based eraser composition, (b) a rubber-based eraser composition, and (c) an elastomer-based eraser composition, and (a) the plastic-based eraser composition comprises at least one of a vinylchloride resin and a vinylacetate resin, and comprises a filler, (b) the rubber-based eraser composition comprises a rubber component, factice, sulfur, a vulcanizing accelerator, and a filler, (c) the elastomer-based eraser composition comprises a thermoplastic elastomer and a filler.