Patent · US Expired

Light-sensitive material containing a dye-forming combination of a heterocyclic compound and a cyclic dihalodicarbonyl compound in a polymeric binder

US4030926A · kind A · utility

6Cited by

4References

5Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Kurt-Rainer Stahlke · Leverkusen, DE
Werner Krafft · Leverkusen, DE
Rudolf Meyer · Leverkusen, DE
Hans J. Rosenkranz · Krefeld, DE

Key dates

Filing date	Jul 7, 1975
Grant date	Jun 21, 1977
Priority date	—
Expiry date	Jul 7, 1995

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/675
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A storage medium for optical data recording comprises a dye-forming combination which on exposure to light within a first range of wavelengths reacts irreversibly to form a dye, but is substantially insensitive to light within a second range of wavelengths which is capable of energizing the dye to produce luminescence. The dye-forming combination consists of a heterocyclic compound of the formula I and of a cyclic dihalodicarbonyl compound of the formula II ##STR1## The symbols are defined in the specification. An example of formula I is benzofuran and an example of formula II is dibromomaleic anhydride.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.