Heat-sensitive transfer element

{
  "publication_number": "US4315643A",
  "country": "US",
  "kind": "A",
  "title": "Heat-sensitive transfer element",
  "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.",
  "claims": [
    "1. A heat-sensitive transfer element comprising a foundation having a thickness of 20 to 60μ, density of 0.75 to 1.3 g/cm 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 2 and a heat conductivity of 4×10 -4 to 15×10 -4 cal./sec. cm. °C. provided on the back surface; the hot-melt ink layer including a heat-conductive material powder which has a heat conductivity of 6.0×10 -4 to 25.0×10 -4 cal./sec. cm. °C., and a solid wax which has a penetration of 10 to 30 at 25° C. as a binder material, and having a viscosity of 20 to 200 cP at 100° C.",
    "2. The transfer element of claim 1, wherein said back surface of the foundation has a Bekk smoothness of 200 to 16000 seconds.",
    "3. The transfer element of claim 1, wherein said foundation is a paper having a thickness of 30 to 50μ and a density of 0.8 to 1.2 g./cm. 3.",
    "4. The transfer element of claim 1, wherein said hot-melt ink layer has a heat conductivity of 5×10 -4 to 9×10 -4 cal./cm. sec. °C.",
    "5. The transfer element of claim 1, wherein said thermal color-developing layer is a coating layer prepared by dispersing dye precursor and an acid which is solid or semi-solid in a binder material, and has a thickness less than about 10μ.",
    "6. The transfer element of claim 1 or 5, wherein said hot-melt ink layer further includes a coloring material and a softener, and has a coating weight of about 3 to 10 g./m. 2.",
    "7. The transfer element of claim 6, wherein 2 to 30 parts by weight of said heat-conductive material, 5 to 25 parts by weight of the coloring material, 5 to 85 parts by weight of the binder material and 5 to 35 parts by weight of the softener are used per 100 parts by weight of the total amount of the hot-melt ink layer."
  ],
  "cpc": [
    "B41M 5/48",
    "B41M 5/30",
    "B41M 5/38207",
    "Y10S 428/913",
    "Y10T 428/2495",
    "Y10T 428/24992",
    "Y10T 428/26",
    "Y10T 428/266",
    "Y10T 428/273",
    "Y10T 428/277",
    "Y10T 428/31801"
  ],
  "assignees": [
    "NIPPON TELEGRAPH & TELEPHONE"
  ],
  "filing_date": "1980-05-23",
  "publication_date": "1982-02-16",
  "grant_date": "1982-02-16",
  "priority_date": "1979-11-26",
  "application_number": "US-15276980-A",
  "family_id": "15564030",
  "citations": [
    "US3983279A"
  ]
}