US 11,940,735 B2
Developer composition for flexographic printing plate, developer, and method of manufacturing printing original plate
Hiroto Yamada, Okayama (JP)
Assigned to TOYOBO MC CORPORATION, Osaka (JP)
Appl. No. 17/427,142
Filed by TOYOBO CO., LTD., Osaka (JP)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/013962
§ 371(c)(1), (2) Date Jul. 30, 2021,
PCT Pub. No. WO2020/196820, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-063700 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0100095 A1, Mar. 31, 2022
Int. Cl. G03F 7/32 (2006.01); B41C 1/10 (2006.01)
CPC G03F 7/322 (2013.01) [B41C 1/1016 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for manufacturing a flexographic printing plate, comprising a step of developing a CTP flexographic printing original plate with use of an aqueous developer, wherein the CTP flexographic printing original plate has at least (A) a support, (B) a photosensitive resin layer, (C) a protective layer, and (D) an infrared-sensitive layer that contains carbon black, which are stacked in this order, and wherein the aqueous developer comprises 90 to 99.9% by mass of water and 0.1 to 10% by mass of a developer composition containing (a) a nonionic surfactant, the nonionic surfactant consisting of monoalkyl ether and/or monoalkyl ester of polyethylene glycol, wherein a number of carbon atoms of the alkyl group therein is 8 to 19, and wherein an HLB value thereof is 11 to 15; and (b) one or more anionic surfactants selected from the group consisting of oleic acid metal salt, lauric acid metal salt, dodecylbenzene sulfonic acid metal salt and lauryl sulfate metal salt, wherein a content ratio of (a):(b) is 25:75 to 75:25 (mass ratio), and wherein a brushing friction coefficient on a surface of a printing original plate is 0.60 to 0.75[−], when measured in an aqueous developer containing 1% by mass of the developer composition and 99% by mass of water.