Title:
【発明の名称】ホトクロミック印刷インキおよびその製造方法
Document Type and Number:
Japanese Patent JP2972216
Kind Code:
B2
Abstract:
Photochromic printing inks are disclosed which are in particular used for the printing of security documents. Prints are normally nearly colorless and become colored when energy irradiated, such as by ultraviolet light. This photocoloration is reversible. The printing inks contain photochromic compounds which are protected against oxygen and other ink components. Methods are described to prepare the inks, to print security documents, and to detect counterfeiting.
Inventors:
Albert Amon
Heim bretler
Anton Blakeum
Heim bretler
Anton Blakeum
Application Number:
JP361889A
Publication Date:
November 08, 1999
Filing Date:
January 10, 1989
Export Citation:
Assignee:
Shikpa Holding Society Anonym
International Classes:
B41M3/00; B41M3/14; C09B67/08; C09D11/00; C09K9/02; G03C1/685; C09D11/02; (IPC1-7): C09D11/02
Domestic Patent References:
| JP6177846A | ||||
| JP62227794A | ||||
| JP63223084A | ||||
| JP63268786A | ||||
| JP4528892B1 |
Other References:
【文献】米国特許4012232(US,A)
Attorney, Agent or Firm:
Akira Asamura (2 outside)