EP 0243285 A1 19871028 - Security paper made tamper-proof and/or authenticatable by way of thermochromism, and process for its preparation.
Title (en)
Security paper made tamper-proof and/or authenticatable by way of thermochromism, and process for its preparation.
Title (de)
Durch Thermochromie fälschungssicheres und/oder auf seine Echtheit zu prüfendes Sicherheitspapier und sein Herstellungsverfahren.
Title (fr)
Papier de sécurité infalsifiable et/ou authentifiable par thermochromie et son procédé de préparation.
Publication
Application
Priority
FR 8606144 A 19860424
Abstract (en)
1. Security paper, tamperproof because of an irreversible colour reaction and/or authenticatable because of a reversible colour, containing a water-soluble combination of crystal violet lactone (I) of formula see diagramm : EP0243285,P12,F1 and of an aliphatic organic acid containing a short hydrocarbon chain.
Abstract (fr)
- Papeterie. - Le papier de sécurité infalsifiable et/ou authentifiable conforme à l'invention contient une association soluble dans l'eau de cristal violet lactone (I) de formule : <IMAGE> et d'un acide organique aliphatique à courte chaîne hydrocarbonée. - Application aux papiers de sécurité.
IPC 1-7
IPC 8 full level
B42D 15/00 (2006.01); B44F 1/12 (2006.01); D21H 21/46 (2006.01); D21H 21/48 (2006.01)
CPC (source: EP)
B42D 25/29 (2014.10); D21H 21/46 (2013.01); D21H 21/48 (2013.01)
Citation (search report)
- [XD] GB 1507454 A 19780412 - WIGGINS TEAPE LTD
- [XD] FR 2279570 A1 19760220 - PORTALS LTD [GB]
- [AD] DE 1228972 B 19661117 - KARLHEINZ KOENIG DR
- [YD] JOURNAL OF IMAGING TECHNOLOGY, vol. 11, no. 5, octobre 1985, pages 224-228, Society of Photographic Scientists and Engineers, Springfield, Virginia, US; J.E. ASSNER: "Leuco color formers, modern imaging materials"
Designated contracting state (EPC)
DE ES GB IT NL
DOCDB simple family (publication)
EP 0243285 A1 19871028; EP 0243285 B1 19890816; DE 3760455 D1 19890921; ES 2012811 B3 19900416; FR 2597895 A1 19871030; FR 2597895 B1 19890728; PT 84736 A 19870501; PT 84736 B 19891229
DOCDB simple family (application)
EP 87420103 A 19870421; DE 3760455 T 19870421; ES 87420103 T 19870421; FR 8606144 A 19860424; PT 8473687 A 19870422