Patent number: 6368779
Abstract: Photothermographic materials have increased photospeed provided by certain organic solvent-soluble thiourea compounds that can be represented by the following Structure I, II, or III:
wherein in Structure I, R1, R2, R3 and R4 are independently alkyl, cycloalkyl, allyl, alkenyl, alkynyl, aryl or heterocyclic groups, or R1 and R2 taken together, R3 and R4 taken together, R1 and R3 taken together or R2 and R4 taken together, can form a 5- to 7-membered heterocyclic ring, in Structure II, R1, R2, R3, R4 and R5 are independently alkyl, cycloalkyl, allyl, alkenyl, alkynyl, aryl or heterocyclic groups, or R3 and R5 taken together, R4 and R5 taken together, R1 and R3 taken together or R2 and R4 taken together, can form a substituted or unsubstituted 5- to 7-membered heterocyclic ring, and in Structure III, R1, R2, R3, R4, R5, and R6 are independently alkyl, cycloalkyl, allyl, alkenyl, alkynyl, aryl or heterocyclic groups, or R3 and R6 taken together, R4 and R5 taken together, R1 and R3 taken togethe
Type:
Grant
Filed:
September 21, 2000
Date of Patent:
April 9, 2002
Assignee:
Eastman Kodak Company
Inventors:
Doreen C. Lynch, Sharon M. Simpson, Steven M. Shor, Brian C. Willett, Chaofeng Zou