Photosensitive compositions based on acrylates

Abstract

A liquid photosensitive composition comprising (1) 40 to 80% by weight of a urethane (meth)acrylate having a functionality of 2 to 4 and a molecular weight (Mw) of 500 to 10,000, (2) 5 to 40% by weight of a hydroxyl group containing aliphatic or cycloaliphatic di(meth)acrylate, (3) 0 to 40% by weight of a mono(meth)acrylate or of a mono-N-vinyl compound having a Mw of not more than 500, (4) 0.1 to 10% by weight of a photoinitiator, (5) 0 to 30% by weight of an aliphatic or cycloaliphatic di(meth)acrylate which differs from (2), of an aliphatic tri(meth)acrylate or of an aromatic di- or tri(meth)acrylate, and (6) 0 to 5% by weight of customary additives, such that the proportion of components (1) to (6) together is 100% by weight. The composition is a photosensitive composition which can be polymerised by irradiation with actinic light and which is suitable for the production preferably of three-dimensional objects by the stereolithographic technique.

Dependencies are inferred from the claim text.