| 摘要 |
<p>PURPOSE:To obtain an oily ink composition containing a specific compound as a lubricant, having an effect on preventing the abrasion of a ball bearing seat because of its excellent lubricity, little in the blurry starting writing with the ball point pen due to the noncorrosion of copper (alloy), and not causing the discoloration of an ink with rust. CONSTITUTION:This ink composition is characterized by adding (D) a compound of the formula (R1-R4 are H, 1-2C alkyl; R<5>, R<6> are 1-2C alkyl, halogen) (e.g. 4,4'-diamino-3,3'-dimethyldiphenylmethane) as a lubricant, preferably in an amount of 0.5-10wt.% based on the whole amount of the composition, to a ball point oily ink composition comprising (A) an oil-soluble dyestuff (e.g. spirone orange GRH, rhodamine) or a pigment (e.g. azo pigment or titanium dioxide, (B) an oil-soluble resin (e.g. a ketone resin or phenol resin), and (C) an organic solvent (e.g. benzyl alcohol or phenoxyethanol). The components A, B and C are preferably compounded in amounts of 1-30 wt.%, 1-30wt.%, and 20-70wt.%., respectively, based on the whole amount of the ink composition.</p> |
