Patent US600696A successfully refreshed from Google Patents.
Patent EP0409526A2 successfully refreshed from Google Patents.
EP0409526A2
Expired / Lapsed
EP
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Thermal transfer receiver
Assignee: Imperial Chemical Industries Ltd
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Filing: 1990-07-16
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Granted: —
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Expires: 2010-07-16
Abstract
Abstract A thermal transfer receiver sheet with improved handling properties comprises a sheet-like dielectric substrate supporting a receiver coat of dye-receptive material on one side, characterised in that there are antistatic treatments provided on both sides of the dielectric substrate, such treatments being sufficient on each side to reduce the surface resistivity to less than 1x10¹³ Ω/square. The side of the substrate remote from the receiver layer suitably has an antistatic backcoat for reducing the surface resistivity on that side, and the use of a textured surface provided by particulate materials either in the antistatic backcoat or in a further backcoat overlying the antistatic backcoat, may further improve the handling properties.
Inventors
- 👤 John Anthony Pope
- 👤 Roger Rowan Lodge Barker
- 👤 Richard Anthony Hann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 17:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/41; B41M5/426; B41M5/44; B41M5/50; B41M5/52; B41M5/529; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/25
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
A receiver sheet for dye-diffusion thermal transfer printing comprises a sheet-like dielectric substrate supporting a receiver coat of dye-receptive material on one side, characterised in that there are antistatic treatments provided on both sides of the dielectric substrate, such treatments being sufficient on each side to reduce the surface resistivity to less than 1x10¹³ Ω/square.
Claim 2
Dependent Claim
55 words
A receiver sheet for dye-diffusion thermal transfer printing comprises a sheet-like dielectric substrate supporting a receiver coat of dye-receptive material on one side, characterised in that there are antistatic treatments provided on both sides of the dielectric substrate, such treatments being sufficient on each side to reduce the surface resistivity to less than 1x10¹³ Ω/square.
Claim 3
Dependent Claim
63 words
A receiver sheet as claimed in claim 1, characterised in that to provide the antistatic treatment on the side of the substrate remote from the receiver coat, it has an antistatic backcoat comprising (a) a thermoset cross-linked polymer matrix stable to elevated temperatures of at least 150°C, and (b) an antistatic agent sufficient to reduce the surface resistivity to less than 1x10¹³ Ω/square.
Claim 4
Dependent Claim
57 words
A receiver sheet as claimed in claim 1, characterised in that it has an exposed backcoat surface which is textured, this textured backcoat being provided by a layer of inert particulate material within the size range 2 to 10 µm in diameter, embedded in a thermoset cross-linked polymer matrix stable to elevated temperatures of at least 150°C.
Claim 5
Dependent Claim
57 words
A receiver sheet as claimed in claim 3, characterised in that the particulate material comprises a mixture of small and large particles, at least 90% of the particles being within the size ranges 2-3 µm and 5-7 µm, with the particles distributed between the two size ranges according to a ratio within the range 1:2 to 1:5.
Claim 6
Dependent Claim
41 words
A receiver sheet as claimed in claim 3, characterised in that it has a plurality of backcoats comprising the textured backcoat and the antistatic backcoat as separately applied coatings, with the antistatic backcoat underlying the textured backcoat containing the inert particles.
Claim 7
Dependent Claim
108 words
A receiver sheet as claimed in claim 3, characterised in that the antistatic backcoat and the textured backcoat are combined in the same backcoat, comprising an acid catalysed composition consisting essentially of (a) a thermoset cross-linked polymer matrix stable to elevated temperatures of at least 150°C, (b) an antistatic agent sufficient to reduce the surface resistivity to less than 1x10¹³ Ω/square, and (c) particulate material comprising a mixture of small and large particles, at least 90% of the particles being within the size ranges 2-3 µm and 5-7 µm, with the particles distributed between the two size ranges according to a ratio within the range 1:2 to 1:5.
Claim 8
Dependent Claim
80 words
A receiver sheet as claimed in claim 2, characterised in that the thermoset cross-linked polymer matrix is the reaction product of an organic solvent-soluble, thermoplastic polymeric material having a plurality of reactive hydroxyl groups per molecule, and a crosslinking agent reactive with the hydroxyl groups of the thermoplastic polymer, the functionality of one of the polymer and cross-linking agent being at least 2, and the functionality of the other being at least 3, thereby to produce a multi-crosslinked polymer matrix.
Claim 9
Dependent Claim
42 words
A receiver sheet as claimed in claim 7, characterised in that the crosslinking agent is a polyfunctional N-(alkoxymethyl) amine resin having at least three alkoxymethyl groups per molecule which are available to react with the hydroxyl groups, thereby to provide its polyfunctionality.
Claim 10
Dependent Claim
17 words
A receiver sheet as claimed in claim 8, characterised in that the crosslinking agent is a hexamethoxymethylmelamine.
Claim 11
Dependent Claim
30 words
A receiver sheet as claimed in claim 2, characterised in that the antistatic backcoat comprises the thermoset cross-linked polymer matrix doped with an alkali metal salt as the antistatic agent.
Claim 12
Dependent Claim
16 words
A receiver sheet as claimed in claim 10, characterised in that the alkali metal is lithium,
Claim 13
Dependent Claim
19 words
A receiver sheet as claimed in claim 11, characterised in that the lithium salts include salts of organic acids.
Claim 14
Dependent Claim
19 words
A receiver sheet as claimed in claim 1, characterised in that the substrate is a sheet of thermoplastic film.
Claim 15
Dependent Claim
32 words
A receiver sheet as claimed in claim 1, characterised in that the substrate is a laminate comprising a plurality of sheets at least one of which is formed of a thermoplastic material.
Claim 16
Dependent Claim
26 words
A stack of print size portions of a receiver sheet according to any one of the preceding claims, packaged for use in a thermal transfer printer.
References Cited (Backward Citations)
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