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EP0458538A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Thermal transfer dyesheet

Assignee: Imperial Chemical Industries Ltd
•
Filing: 1991-05-17
•
Granted: —
•
Expires: 2011-05-17
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Abstract

Abstract A dyesheet is provided for thermal transfer printing, comprising a base sheet having a dyecoat containing a thermal transfer dye layer on one surface, and on the other a crosslinked heat resistant backcoat formulated to minimise dye migration from the dyecoat to the backcoat during storage. The backcoat comprises the reaction product of radically copolymerising in a layer of coating composition, a ) at least one organic compound having a plurality of radically polymerisable unsaturated groups per molecule, and b ) at least one organic compound having per molecule a single unsaturated group radically copolymerisable with constituent a , and having at least one alicyclic group per molecule. Preferred additional constituents include slip agents, especially a multivalent metal salt of a long chain alkyl or alkylphenyl phosphate ester.

Inventors

  • 👤 Richard Anthony Hann
  • 👤 Warren Thomas Smith
  • 👤 Barry Pack
  • 👤 Kazuhiko Sakata

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 18:13
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/44; B41M5/423; B41M5/426; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/31504; Y10T428/31855

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 98 words
A dyesheet for thermal transfer printing, which comprises a base sheet having on one surface a dyecoat containing a thermal transfer dye and a backcoat on the other surface, wherein the backcoat comprises the reaction product of radically copolymerising in a layer of coating composition, the following compounds as essential constituents: a ) at least one organic compound having a plurality of radically polymerisable unsaturated groups per molecule, and b ) at least one organic compound having per molecule a single unsaturated group radically copolymerisable with constituent a , and having at least one alicyclic group per molecule.
Claim 2
Dependent Claim 31 words
A dyesheet as claimed in claim 1, characterised in that the composition has the polymerisable constituents a and b in the proportions of a 50-90% and b correspondingly 50-10% by weight.
Claim 3
Dependent Claim 52 words
A dyesheet as claimed in claim 1 or claim 2, characterised in that the backcoat composition contains in addition to constituents a and b , at least one slip agent selected from derivatives of long chain carboxylic and phosphoric acids, long alkyl chain esters of phosphoric acid, and long alkyl chain acrylates.
Claim 4
Dependent Claim 59 words
A dyesheet as claimed in claim 3, characterised in that the slip agent is a metallic salt of a phosphate ester, which is expressed by the following general formula (A) or (B): in which R is an alkyl group of C₈₋₃₀ or an alkylphenyl group, m is an integral number of 2 or 3, and M a metal atom.
Claim 5
Dependent Claim 39 words
A dyesheet as claimed claim 4, characterised in that the quantity of slip agent in the composition lies within the range 1-20% by weight of the total amount of the radically polymerisable compounds of constituents a and b .
Claim 6
Dependent Claim 54 words
A dyesheet as claimed in any one of the preceding claims, characterised in that in addition to constituents a and b, the backcoat also contains at least one linear organic polymer in amount within the range 1-20% by weight of the total amount of the radically polymerisable compounds of constituents a and b .

References Cited (Backward Citations)

EP0153880A2 Cited
EP0314205A1 Cited
EP0314348A2 Cited
EP0329117A1 Cited

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