Patent · US Expired

Silver-free light-sensitive material

US4360587A · kind A · utility

1Cited by

1References

31Claims

0Family size

Assignee

VEB Filmfabrik Wolfen · DE

Inventors

Carmen Haessner geb. Michael · Bitterfeld-Wolfen, DE
Heinz Mustroph · Dessau, DE
Jorg Marx · Dessau, DE

Key dates

Filing date	Aug 10, 1981
Grant date	Nov 23, 1982
Priority date	—
Expiry date	Aug 10, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/675
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

This invention relates to a radiation-sensitive, silver-free recording material for direct optical recording with high sensitivity, characterized by its exceptional resistance to light and heat and large solubility. This is achieved by the fact that the recording material contains as coloring substances, azo dyestuffs of the general formula ##STR1## R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 are the same or different and are halogen, alkoxy, alkyl, acetyl, amino; R.sub.8 hydroxy, alkoxy or acetylamino. The material distinguishes itself by the different processing variations that are possible so that with a same basic type, it is possible to obtain pictures operating according to a positive principle as well as according to a negative principle.

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