Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Patent
1995-06-22
1996-11-19
Letscher, Geraldine
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
430599, 430600, 430607, 430611, 430581, 430583, 430585, 430511, 430966, G03C 146
Patent
active
055761542
ABSTRACT:
The invention involves a process for making photographic recording materials for radiography having comparable sensitivity and high visual resolution in the resulting x-ray images, whether used with green-emitting or blue-emitting intensifying screens. The invention also describes a process for making x-ray images by the use of such recording materials. The invention regulates the ratio of the silver halide coating's blue to green sensitivity by the addition of an aliphatic 2-amino-1-thio compound of Formula I: ##STR1## wherein R.sup.1 =alkyl of 1 to 5 carbons, aryl, alkylacyl of 1 to 5 carbons, H or arylacyl;
R.sup.2, R.sup.3, R.sup.4, R.sup.5 =H, alkyl of 1 to 4 carbons or COR.sup.7 ;
R.sup.6 =H or alkyl of 1 to 5 carbons,
R.sup.7 =OH, NHR.sup.8, or O-R.sup.10 where R.sup.10 is an alkyl of 1 to 5 carbons;
R8, R9=H or alkyl of 1 to 5 carbons;
R.sup.1 and R.sup.6 taken together represent one to three methylene groups bridging the nitrogen and the sulfur; and
R.sup.1 and R.sup.6 can be replaced by cyclization between the nitrogen atom and the sulfur atom involving one to three optionally substituted methylene groups.
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M ussig-Pabst Thomas
W orsching Alfred
Letscher Geraldine
Sterling Diagnostic Imaging, Inc.
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