Polymerisable compositions containing tetraacrylates

Abstract

Photopolymerisable compositions comprising (a) a tetraacrylate of formula I or II ##STR1## wherein R.sub.1 is a hydrogen atom or methyl, X.sub.1 and X.sub.2 are each independently of the other --O-- or --CO--O--, R.sub.2 is a divalent aliphatic, cycloaliphatic or aromatic radical of a diglycidyl compound that contains no more glycidyl ether or ester groups, A is a divalent aliphatic, cycloaliphatic or aromatic radical of a diisocyanate compound that contains no more isocyanate groups, n is an integer from 1 to 8, and R.sub.3 is a tetravalent cycloaliphatic radical of a diepoxide compound that contains no more 1,2-epoxide groups at the cycloaliphatischen ring, (b) at least one liquid radically polymerisable compound that differs from component a), and (c) a radical photoinitiator, are suitable preferably for the production of three-dimensional objects by the stereolithographic technique.

Dependencies are inferred from the claim text.