Patent EP0753623A2 successfully refreshed from Google Patents.
EP0753623A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Security sheet, particularly of the type that includes an electrically conducting element
Assignee: Mantegazza Antonio Arti Grafiche SRL
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Filing: 1996-07-10
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Granted: —
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Expires: 2016-07-10
Abstract
Abstract The present invention relates to a security sheet, usable in particular in the paper industry, which includes an electrically conductive element which, by virtue of detection devices, allows precise detection and easy monitoring and is therefore particularly adapted as an anti-forgery system in the production of security documents, such as currency bills, checks, and personal identification documents.
Inventors
- 👤 Mario Giustiniani
- 👤 Antonio Mantegazza
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:35
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; B; B41; B41M; B41M3/00; B41M3/14; B42; B42D; B42D25/00; B42D25/30; B42D25/355; G; G07; G07D; G07D7/00; G07D7/004; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
11 words
Security sheet comprising a support matrix and an intrinsically conductive polymer.
Claim 2
Dependent Claim
32 words
Sheet according to claim 1, characterized in that said intrinsically conductive polymer is chosen from the group comprising polyaniline, polypyrrole, polythiophene, polyphenylene vinylidene, polydiphenylamine, in substituted and unsubstituted form, and mixtures thereof.
Claim 3
Dependent Claim
14 words
Sheet according to claim 2, characterized in that said intrinsically conductive polymer is polyaniline.
Claim 4
Dependent Claim
23 words
Sheet according to any one of claims 1 to 3, characterized in that said intrinsically conductive polymer is blended with a thermoplastic polymer.
Claim 5
Dependent Claim
20 words
Sheet according to any one of claims 1 to 4, characterized in that said support matrix is a fiber structure.
Claim 6
Dependent Claim
25 words
Sheet according to claim 5, characterized in that said fiber structure is chosen from the group comprising cellulose fibers, synthetic polymer fibers, and mixtures thereof.
Claim 7
Dependent Claim
16 words
Sheet according to claim 6, characterized in that said support matrix is constituted by cellulose fibers.
Claim 8
Dependent Claim
20 words
Sheet according to any one of claims 1 to 4, characterized in that said support matrix is a thermoplastic polymer.
Claim 9
Dependent Claim
27 words
Sheet according to claim 8, characterized in that said thermoplastic polymer is chosen from the group comprising polyester, polyethylene, polyvinyl acetate, polyvinyl chloride, ABS, and mixtures thereof.
Claim 10
Dependent Claim
23 words
Sheet according to any one of claims 1 to 9, characterized in that said intrinsically conductive polymer is shaped as a security thread.
Claim 11
Dependent Claim
26 words
Security sheet, comprising a support matrix made of cellulose fibers and a security thread including a blend of a thermoplastic polymer with an intrinsically conductive polymer.
Claim 12
Dependent Claim
14 words
Sheet according to claim 11, characterized in that said thermoplastic polymer consists of polyester.
Claim 13
Dependent Claim
16 words
Sheet according to claim 11 or 12, characterized in that said intrinsically conductive polymer is polyaniline.
Claim 14
Dependent Claim
33 words
Sheet according to claim 13, characterized in that said polyaniline is present, in said blend, in an amount between 0.1% and 40% by weight with respect to the weight of the thermoplastic polymer.
Claim 15
Dependent Claim
21 words
Sheet according to claim 11, characterized in that said blend has conductivity values between 10 -8 and 10 S.cm -1 .
Claim 16
Dependent Claim
17 words
Sheet according to claim 11, characterized in that said blend has transparency values between 25% and 95%.
Claim 17
Dependent Claim
33 words
Security sheet comprising a support matrix made of cellulose fibers and a security thread including a polyester layer on which there is a layer of intrinsically conductive polymer blended with a compatible binder.
Claim 18
Dependent Claim
14 words
Sheet according to claim 17, characterized in that said intrinsically conductive polymer is polyaniline.
Claim 19
Dependent Claim
17 words
Sheet according to claim 17 or 18, characterized in that said binder is of the acrylic type.
Claim 20
Dependent Claim
30 words
Sheet according to any one of claims 17 to 19, characterized in that said intrinsically conductive polymer is present in a layer whose thickness is between 1 and 10 microns.
Claim 21
Dependent Claim
33 words
Sheet according to any one of claims 17 to 20, characterized in that said intrinsically conductive polymer is present in an amount between 1% and 40% by weight with respect to said binder.
Claim 22
Dependent Claim
23 words
Sheet according to any one of claims 17 to 21, characterized in that said security thread has transparency values between 25% and 95%.
Claim 23
Dependent Claim
21 words
Sheet according to any one of claims 11 to 22, characterized in that said security thread also comprises a magnetic material.
Claim 24
Dependent Claim
14 words
Sheet according to claim 23, characterized in that said magnetic material is applied discontinuously.
Claim 25
Dependent Claim
36 words
Sheet according to any one of claims 11 to 24, characterized in that said thread comprises regions that are covered with printing ink so as to form portions that can be perceived visually against the light.
Claim 26
Dependent Claim
24 words
Sheet according to any one of claims 11 to 25, characterized in that said security thread has a thickness between 10 and 50 µm.
Claim 27
Dependent Claim
28 words
Sheet according to any one of claims 1 to 9, characterized in that said intrinsically conductive polymer is in the form of fibers dispersed in said support matrix.
Claim 28
Dependent Claim
25 words
Sheet according to claim 27, characterized in that said intrinsically conductive polymer fibers are localized in limited regions of the surface of said support matrix.
Claim 29
Dependent Claim
29 words
Sheet according to claim 27, characterized in that said intrisically conductive polymer fibers have a length between 1 and 20 mm and a diameter between 3 and 30 µm.
Claim 30
Dependent Claim
30 words
Sheet according to any one of claims 1 to 9, characterized in that said conductive polymer is applied to the support as security ink by means of a printing method.
Claim 31
Dependent Claim
25 words
Sheet according to claim 30, characterized in that said intrinsically conductive polymer included in a security ink is applied to the support by copperplate printing.
Claim 32
Dependent Claim
30 words
Sheet according to any one of claims 1 to 9, characterized in that said support matrix is made of polyester and said electrically conductive polymer is applied by screen printing.
Claim 33
Dependent Claim
25 words
Use of an intrinsically conductive polymer to produce a security sheet having conductive properties that can be detected by virtue of electrical conductivity detection means.
Claim 34
Dependent Claim
33 words
Use according to claim 33, characterized in that said intrinsically conductive polymer is chosen from the group that comprises polyaniline, polythiophene, polypyrrole, polyphenylene vinylidene, polydiphenylamine, in substituted or unsubstituted form, and blends thereof.
Claim 35
Dependent Claim
14 words
Use according to claim 34, characterized in that said intrinsically conductive polymer is polyaniline.
References Cited (Backward Citations)
No citation records indexed.
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