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A liquid, radiation-curable composition which in addition to a liquid, free-radically polymerizable component comprises at least the following additional components: (A) from 40 to 80 percent by weight of a liquid difunctional or more highly functional epoxy resin or of a liquid mixture consisting o

A liquid, radiation-curable composition which in addition to a liquid, free-radically polymerizable component comprises at least the following additional components: (A) from 40 to 80 percent by weight of a liquid difunctional or more highly functional epoxy resin or of a liquid mixture consisting of difunctional or more highly functional epoxy resins; (B) from 0.1 to 10 percent by weight of a cationic photoinitiator or of a mixture of cationic photoinitiators; and (C) from 0.1 to 10 percent by weight of a free-radical photoinitiator or of a mixture of free-radical photoinitiators; and (D) up to 40 percent by weight of a hydroxy compound, in which composition component (D) is selected from the group consisting of:

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[ What is claimed is:] [1.] A liquid, radiation-curable composition which in addition to a liquid, free-radically polymerizable component comprises at least the following additional components:(A) from 40 to 80 percent by weight of a liquid epoxy resin having two or more then two epoxy groups per mo

[ What is claimed is:] [1.] A liquid, radiation-curable composition which in addition to a liquid, free-radically polymerizable component comprises at least the following additional components:(A) from 40 to 80 percent by weight of a liquid epoxy resin having two or more then two epoxy groups per molecule or of a liquid mixture consisting of epoxy resins having two or more than two epoxy resins per molecule;(B) from 0.1 to 10 percent by weight of a cationic photoinitiator or of a mixture of cationic photoinitiators; and(C) from 0.1 to 10 percent by weight of a free-radical photoinitiator or of a mixture of free-radical photoinitiators; and(D) up to 40 percent by weight of a hydroxy compound, in which composition component (D) is selected from the group consisting of:(D1) a phenolic compound having at least 2 hydroxyl groups selected from the group consisting of the dihydroxybenzenes, trihydroxybenzenes and the compounds of the formula (D-I): [ STR 17 ] in which R.sub.1D and R.sub.2D are a hydrogen atom or a methyl group; (D2) a phenolic compound having at least 2 hydroxyl groups, which have been reacted with ethylene oxide, proplyene oxide or with ethylene oxide and propylene oxide, which phenolic compound is selected from the group consisting of the compounds of the formula (D-II): [ STR 18 ] in which R.sub.1D and R.sub.2D are each a hydrogen atom or a methyl group;R.sub.3D and R.sub.4D are all, independently of one another, a hydrogen atom or a methyl group, andxD and yD are each an integer from 1 to 15;(D3) an aliphatic hydroxy compound having not more than 80 carbon atoms selected from the group consisting of trimethylolpropane, glycerol, castor oil and the compounds of the formula (D-III) and (D-IV): [ STR 19 ] in which R.sub.5D is an unbranched or branched (zD)-vatent C.sub.2 -C.sub.20 alkane residue,all radicals R.sub.6D, independently of one another, are a hydrogen atom or a methyl group,zD is an integer from 1 to 4 andvD is an integer from 2 to 20;(D4) a compound having at least one hydroxyl group and at least one epoxide group which is selected from the group consisting of the compounds of the formulae (D-V), (D-VI), (D-VII), (D-VIII) (D-IX) and (D-X): [ STR 20 ] in which R.sub.7D, R.sub.9D and R.sub.10D are each a hydrogen atom or a methyl group and each R.sub.8D is a group selected from the groups of the formulae (D-XI), (D-XII), (D-XIII) and (D-XIV): [ STR 21 ] (D5) a mixture of at least 2 of the compounds mentioned under (D1) to (D4),wherein component (D) is present in the composition in a quantity of at least 2 percent by weight; the free-radically polymerizable component comprises at least(E) from 4 to 30 percent by weight of at least one liquid poly(meth)acrylate having a (meth)acrylate functionality of more than 2; andat least one of components (A) and (D) comprises a substance which has aromatic carbon rings in its molecule. [12.] A method of producing a cured product, in which a composition according to claim 1 is treated with actinic radiation. [13.] A method according to claim 12, in which the cured product produced is a three-dimensional shaped article and in which the article is built up from said composition with the aid of a repeating, alternating sequence of steps (a) and (b); in step (a), a layer of the composition, one boundary of which is the surface of the composition, is cured with the aid of appropriate radiation within a surface region which corresponds to the desired cross-sectional area of the three-dimensional article to be formed, at the height of this layer, and in step (b) the freshly cured layer is covered with a new layer of the radiation-curable, liquid composition, this sequence of steps (a) and (b) being repeated until an article having the desired shape is formed and this article is, if desired, subjected to post-curing.