Patent ID: 7637680

Claim:
A coating tool, comprising: an oily ink; a backflow inhibiting material, the backflow inhibiting material being in contact with said oily ink and moving by following the fluidity of said oily ink in an ink containment tube, the backflow inhibiting material comprising at least one base material component selected from the group consisting of diglycerin/ethylene oxide adducts and diglycerin/propylene oxide adducts, and a gel composition which comprises polyacrylic acids, the polyacrylic acids being present in an amount of 0.1 to 3 wt % with respect to the total amount of said backflow inhibiting material; and microparticle silica, wherein said polyacrylic acids are composed of a plurality of polyacrylic acids with different average molecular weight and comprise polyacrylic acid having an average molecular weight between 1,000,000 and 2,000,000.