Heat-sensitive transfer element
AssigneesNippon Telegraph & Telephone Public Corporation, Fuji Kagakushi Kogyo Co., Ltd.
InventorsYukio Tokunaga, Kiyoshi Sugiyama, Tadao Seto
Life of this patent
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Abstract
A heat-sensitive transfer element comprising a foundation, a thermal color-developing layer provided on the front surface of the foundation and a hot-melt ink layer provided on the back surface of the foundation; the ink layer including a heat conductive material powder and a solid wax, and having a melt-transfer property a printed image to be formed on the thermal color-developing layer by the impression of a thermal head, and simultaneously the hot-melt ink being transferred to a copy sheet facing the transfer element at the hot-melt ink layer side, the duplicated image having good clarity and excellent durability being able to be prepared at a high speed on a thermal printer.
Claims7
A heat-sensitive transfer element comprising a foundation having a thickness of 20 to 60.mu., density of 0.75 to 1.3 g/cm.sup.3 and in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing layer provided on the front surface of said foundation, and a hot-melt ink layer having a coating weight of 1 to 15 g/m.sup.2 and a heat conductivity of 4.times.10.sup.-4 to 15.times.10.sup.-4 cal./sec. cm. .degree.C. provided on the back surface;
- the hot-melt ink layer including a heat-conductive material powder which has a heat conductivity of 6.0.times.10.sup.-4 to 25.0.times.10.sup.-4 cal./sec. cm. .degree.C., and a solid wax which has a penetration of 10 to 30 at 25.degree. C. as a binder material, and having a viscosity of 20 to 200 cP at 100.degree. C.
Dependencies are inferred from the claim text.