Patent ID: 8871133

Claim:
A method of forming a three-dimensional article via stereolithography comprising the steps of: (1) coating a layer of a composition onto a surface, said composition comprising [a] a single cationic photoinitiator, said cationic photoinitiator being (tolylcumyl)iodonium tetrakis(pentafluorophenyl)borate, [b] an epoxide, [c] a photosensitizer component having the following chemical formula: wherein R 1 -R 14 are independently H or C 1 -C 8 saturated or unsaturated, branched or unbranched, substituted or unsubstituted hydrocarbyl; and [d] a free radical photoinitiator component that is different than the photosensitizer component; (2) exposing the layer imagewise to actinic radiation to form an imaged cross-section, wherein the actinic radiation provides sufficient exposure to cause substantial curing of the layer in the exposed areas; (3) coating a layer of said composition onto the previously exposed imaged cross-section; (4) exposing the layer from step (3) imagewise to actinic radiation to form an additional imaged cross-section, wherein the radiation is of sufficient intensity to cause substantial curing of the layer in the exposed areas and to cause adhesion to the previously exposed imaged cross-section; and (5) repeating steps (3) and (4) a sufficient number of times in order to build up a three-dimensional article.