US 12,436,459 B2
Lithographic printing plate precursor and method of use
Christopher D. Simpson, Osterode (DE); Stefanie Hansmann, Osterode (DE); Saija Werner, Hattorf (DE); and Jianbing Huang, Trumbull, CT (US)
Assigned to EASTMAN KODAK COMPANY, Rochester, NY (US)
Filed by Eastman Kodak Company, Rochester, NY (US)
Filed on Mar. 3, 2022, as Appl. No. 17/685,592.
Claims priority of provisional application 63/169,279, filed on Apr. 1, 2021.
Prior Publication US 2022/0317569 A1, Oct. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G03F 7/004 (2006.01); B41C 1/10 (2006.01)
CPC G03F 7/0045 (2013.01) [B41C 1/1008 (2013.01)] 20 Claims
 
1. A lithographie printing plate precursor comprising:
a substrate, and
an infrared radiation-sensitive image-recording layer disposed on the substrate, the infrared radiation-sensitive image-recording layer comprising the following components (1), (2), and (3):
(1) a free radical initiator composition that is capable of generating free radicals upon exposure to infrared radiation, and which comprises an electron-donating agent;
(2) a free radically polymerizable composition; and
(3) a color-changing compound that is represented by the following Structure (I)

OG Complex Work Unit Chemistry
wherein:
Ar1 and Ar2 independently represent the atoms necessary to complete substituted or unsubstituted aromatic rings or to complete substituted or unsubstituted heteroaromatic rings;
R is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl groups;
R1 and R2 are independently unsubstituted alkyl groups or a chain of carbon atoms interrupted by one or more ether or ester linkages;
R3 is a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
Y represents an oxygen atom, a sulfur atom, or a dialkylmethylene group represented by >C(R4R5) wherein R4 and R5 are independently substituted or unsubstituted alkyl groups having 1 to 4 carbons;
A1 and A2 independently represent substituted or unsubstituted alkyl groups, or together they represent the two or three carbon atoms necessary to form a substituted or unsubstituted 5- or 6-membered non-aromatic carbocyclic ring; and
Za represents one or more counter ions to balance the electric charge in the rest of the color-changing compound according to Structure (I).