	US 12,226,997 B2
	Lithographic photopolymer printing plate precursor with improved daylight stability
Katleen Himschoot, Mortsel (BE); Eva Vermeiren, Mortsel (BE); Thomas Billiet, Mortsel (BE); and Fabienne Goethals, Mortsel (BE)
Assigned to ECO3 BV, Mortsel (BE)
Appl. No. 18/008,541
Filed by ECO3 BV, Mortsel (BE)
PCT Filed May 25, 2021, PCT No. PCT/EP2021/063810 § 371(c)(1), (2) Date Dec. 6, 2022, PCT Pub. No. WO2021/249754, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 20178729 (EP), filed on Jun. 8, 2020.
Prior Publication US 2023/0211599 A1, Jul. 6, 2023
Int. Cl. B41C 1/10 (2006.01); G03F 7/031 (2006.01); G03F 7/09 (2006.01); G03F 7/30 (2006.01)

CPC B41C 1/1033 (2013.01) [G03F 7/031 (2013.01); G03F 7/091 (2013.01); G03F 7/3035 (2013.01); B41C 2201/12 (2013.01); B41C 2210/04 (2013.01)]

18 Claims

1. A lithographic printing plate precursor comprising a support and provided thereon, in order,

a negative working image recording layer which undergoes a free-radical polymerization or crosslinking reaction upon exposure to ultraviolet, violet, or infrared light and

an overcoat which comprises (a) a low-molecular radical inhibitor, which is an organic compound having a molecular weight of less than 1000 Dalton, or (b) a polymer which releases a low-molecular radical inhibitor, which is an organic compound having a molecular weight of less than 1000 Dalton, upon heating, wherein the low-molecular radical inhibitor is present or released in the overcoat in an amount of at least 10 mg/m²,

characterized in that upon heating said low-molecular radical inhibitor is capable of diffusing to the image recording layer, thereby rendering the image recording layer less sensitive to daylight than before said heating.