Patent ID: 7749683
Filing Date: 2010-07-06
Classification: G03F

Abstract:
1. A photopolymer printing plate precursor comprising: a photopolymerizable composition on a support, the photopolymerizable composition comprising: a binder, a polymerizable compound, a sensitizer, a photoinitiator, and a polythiol compound, wherein the composition includes, with respect to its total solid weight, from about 0.01 wt. % to about 5 wt. % of the polythiol compound and the polythiol compound is selected from one of the following formulae (IIIa) or (IIIb): wherein R A L s means an integer from 1 to 100; r means 1, 2, 3 or 4; the product of s times r is at least 2; the thiol groups of formulae (IIIa) or (IIIb) may also be present in their tautomeric thione form; the composition, when coated on a support, has a sensitivity of about 150 μJ/cm for polythioles of formula (IIIa), R