Patent EP0457579A1 successfully refreshed from Google Patents.
EP0457579A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security laminates
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1991-05-15
•
Granted: —
•
Expires: 2011-05-15
Abstract
Abstract A security laminate comprises a thermal transfer print having a receiver layer comprising a thermoplastic dye-receptive polymer doped with a cross-linked silicone-containing release system in which the total silicone content is reduced to 0.01-1% by weight of the thermoplastic dye-receptive polymer, and a cover sheet of plastics material bonded to the receiver layer by heat and pressure, preferably without further adhesives between the print and cover sheet.
Inventors
- 👤 Nicholas Clement Beck
- 👤 Paul Andrew Edwards
- 👤 Richard Anthony Hann
- 👤 Gary Wayne Morrison
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:25
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/14; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/529; B41M7/00; B41M7/0027; B32B2425/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A security laminate comprising a) a printed thermal transfer receiver sheet having a sheet-like substrate supporting a receiver layer comprising a thermoplastic dye-receptive polymer doped with a cross-linked silicone-containing release system, in which the total silicone content lies within the range 0.01-1% by weight of the thermoplastic dye-receptive polymer, and into at least part of which has been diffused a print of one or more thermal transfer dyes, and b) a cover sheet of plastics material bonded to the printed receiver layer, at least one of the base sheet and the cover sheet having sufficient transparency for the print to be visible from outside the laminate.
Claim 2
Dependent Claim
32 words
A security laminate as claimed in claim 1, wherein the cover sheet is a supportive card-like sheet, to the extent of being the major contributor to the total thickness of the laminate.
Claim 3
Dependent Claim
14 words
A security laminate as claimed in claim 2, wherein the cover sheet is opaque.
Claim 4
Dependent Claim
32 words
A security laminate as claimed in claim 1, wherein the cover sheet is bonded directly to the receiver layer of the receiver sheet, being free from any layer of added adhesive therebetween.
Claim 5
Dependent Claim
22 words
A security laminate as claimed in claim 4, wherein the cover sheet is manufactured of a white filled polyvinylchoride or polycarbonate composition.
Claim 6
Dependent Claim
21 words
A security laminate as claimed in claim 1, wherein the substrate, receiver layer and cover sheet are coterminous along all edges.
Claim 7
Dependent Claim
48 words
A thermal transfer receiver sheet for making security laminates, comprising a sheet-like substrate supporting a receiver layer comprising a thermoplastic dye-receptive organic polymer doped with a cross-linked silicone-containing release system in which the total silicone content lies within the range 0.01-1% by weight of the thermoplastic dye-receptive polymer.
Claim 8
Dependent Claim
86 words
A thermal transfer receiver sheet as claimed in claim 7, wherein the substrate is a transparent grade of biaxially orientated polyethylene terephthalate film, and the surface supporting the receiver layer has been pretreated before coating with the receiver layer composition, to enhance its adhesion capabilities before application of the receiver layer thereto, the treatment being in the form of a chemical or physical etch to modify the surface structure of the substrate, or a coating of bonding material adhering well to both substrate and receiver layer.
Claim 9
Dependent Claim
42 words
A thermal transfer receiver sheet as claimed in claim 8, wherein the treatment composition for providing the etch is a solution in an organic solvent, of p-chloro-m-cresol, 2,4-dichlorophenol, 2,4,6- or 2,4,5-trichorophenol, 4-chlororesorcinol, or a mixture of such materials in a common solvent.
References Cited (Backward Citations)
US4713365A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.