EP 1753915 A1 20070221 - SECURITY DEVICE WITH TEMPERATURE ACTIVABLE POLYMERIC LAYER
Title (en)
SECURITY DEVICE WITH TEMPERATURE ACTIVABLE POLYMERIC LAYER
Title (de)
SICHERHEITSVORRICHTUNG MIT TEMPERATURAKTIVIERBARER POLYMERSCHICHT
Title (fr)
DISPOSITIF DE SECURITE A COUCHE POLYMERE ACTIVABLE A UNE TEMPERATURE SPECIFIEE
Publication
Application
Priority
- GB 2005002283 W 20050609
- GB 0412981 A 20040610
Abstract (en)
[origin: GB2414962A] Security device 10 has layers 12,15 of a copolymer which switches from opaque to transparent at a specified activation temperature. These layers comprise a hard segment and a crystallisable soft segment or at least one soft segment which is crosslinked and contains a crystallisable soft segment. The device may include demetallised indicia 14 in metal layer 13. The layers 12,15 are opaque at temperatures below the activation temperature (preferably 35-37 {C) and switch to become transparent when warmed above it, revealing the indicia 14. The polymers may be oligomers. Adhesive layers 16 bond the device as a thread 17 on to a substrate from which a secure document 11 is made. Alternatively, the device may overlay an optically variable feature (30, figure 13) which becomes visible through the polymeric film 12 above the activation temperature.
IPC 8 full level
D21H 21/42 (2006.01); B42D 15/00 (2006.01)
CPC (source: EP GB US)
B42D 25/29 (2014.10 - GB); B42D 25/355 (2014.10 - EP US); B42D 25/36 (2014.10 - US); D21H 21/42 (2013.01 - EP GB); D21H 21/48 (2013.01 - GB); G07D 7/003 (2017.05 - GB); B42D 2033/26 (2022.01 - EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005121450 A1 20051222; AT E380268 T1 20071215; AU 2005252433 A1 20051222; DE 602005003666 D1 20080117; DE 602005003666 T2 20081113; EP 1753915 A1 20070221; EP 1753915 B1 20071205; ES 2297722 T3 20080501; GB 0412981 D0 20040714; GB 0511753 D0 20050720; GB 2414962 A 20051214; GB 2414962 B 20060517; PL 1753915 T3 20080530
DOCDB simple family (application)
GB 2005002283 W 20050609; AT 05750378 T 20050609; AU 2005252433 A 20050609; DE 602005003666 T 20050609; EP 05750378 A 20050609; ES 05750378 T 20050609; GB 0412981 A 20040610; GB 0511753 A 20050609; PL 05750378 T 20050609