Oily ink for writing instrument
AssigneeSakura Color Products Corporation
InventorsTakeshi Omatsu, Hiroshi Inoue
Life of this patent
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Abstract
A writing instrument has an ink containment tube and a pen tip equipped at one end of the ink containment tube with an oily ink contained in the ink containment tube. The oily ink shows pseudo-plasticity fluidity and comprises a colorant, a resin, an organic solvent and a gelling agent.
Claims25
A writing instrument having an ink containment tube and a pen tip equipped at one end of said ink containment tube, wherein an oily ink and an ink follower contacting said oily ink and following the outflow of said oily ink are contained in said ink containment tube and said oily ink is an ink comprising a colorant, a resin, an organic solvent, and a gelling agent and showing pseudo-plasticity fluidity.
A writing instrument as set forth in clam 1, further comprising a nonionic surface-active agent.
Dependencies are inferred from the claim text.