| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a carbon ink used for forming a back carbon layer of carbon paper which is intended for copying with writing pressure, wherein the back carbon layer is formed by typical offset printing. <P>SOLUTION: The offset ink for forming a back carbon layer satisfies one or more of the following conditions (a) to (c) and satisfies the following conditions (d) and (e): (a) the ink contains an adipic acid ester plasticizer or a phthalic acid ester plasticizer; (b) the ink contains 1.0-10 mass% of nondrying oil; (c) the ink contains a machine oil in the viscosity section ISO VG 8-1,000 as defined in JIS K2238; (d) the ink contains HQ (hydroquinone) or the like as an antioxidant; and the ink contains one or more waxes selected from the group consisting of PTFE (polytetrafluoroethylene) wax, PE (polyethylene) wax, paraffine wax, and micro crystalline wax. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
