Patent ID: 7574959
Filing Date: 2009-08-18
Classification: G03F,Y10T

Abstract:
1. A radiation-sensitive composition comprising (a) at least one photopolymerizable compound with at least one ethylenically unsaturated group accessible to a free-radical polymerization, wherein the at least one photopolymerizable compound has a molecular weight of 3,000 or less and is obtained by reacting a diisocyanate with (i) an ethylenically unsaturated compound with a hydroxy group, and at the same time (ii) a saturated organic compound with an NH group and an OH group, wherein the reactants are used in amounts according to the following condition: Number of moles of isocyanate groups≦number of moles of OH plus NH groups; (b) at least one sensitizer which absorbs radiation from the wavelength range of 250 to 450 nm of the electromagnetic spectrum and is selected from: (i) a 1,4-dihydropyridine derivative of formula (I) wherein R R R or R is present in the carbocyclic or heterocyclic ring adjacent to position 5 of the 1,4-dihydropyridine ring and wherein the carbocyclic or heterocyclic ring optionally comprises additional substituents, or both R is present in the carbocyclic or heterocyclic rings adjacent to positions 3 and 5 of the dihydropyridine ring and wherein the carbocyclic or heterocyclic rings optionally comprise additional substituents, or one of the pairs R is present in the carbocyclic or heterocyclic ring adjacent to position 5 or 3 of the dihydropyridine ring and wherein the carbocyclic or heterocyclic ring optionally comprises additional substituents and the other pair forms an optionally substituted phenyl ring, or R R R wherein L is an alkylene or arylene group and R R R (ii) an oxazole compound of formula (II) wherein each R wherein R′ and R″ are independently selected from a hydrogen atom, an alkyl, aryl or aralkyl group, (c) at least one coinitiator capable of fonning free radicals together with the sensitizer (b) and selected from 2,2′,4,4′,5,5′-hexaarylbiimidazoles, compounds with at least one photolytically cleavable trihalogenmethyl group, diaryliodonium salts, triarylsulfonium salts and N-heterocyclic compounds with at least one nitrogen atom in the ring, having an oxy substituent at at least one ring nitrogen atom, and mixtures of the above compounds; and (d) optionally one or more components selected from alkali-soluble binders, colorants, exposure indicators, plasticizers, chain transfer agents, leuco dyes, surfactants, inorganic fillers and thermopolymerization inhibitors; and additionally comprising at least one component with at least one ethylenically unsaturated free-radical polvmerizable group and at least one P-OH group, with the proviso that the radiation-sensitive composition does not comprise a metallocene.