Patent ID: 7767132

Claim:
A process for forming a three-dimensional article in sequential cross-sectional layers in accordance with a model of the article, the process comprising the steps of: (i) defining a layer of powder material comprising a first reactive component; (ii) applying to the layer in a pattern corresponding to a respective cross-sectional layer of the model a liquid reagent comprising a second reactive component wherein the second reactive component includes an oxetane and a photoinitiator; (iii) irradiating the layer with electromagnetic radiation to cause the first reactive component to chemically react with itself or with the second reactive component to form a new chemical component and optionally to cause the second reactive component to cure and fill in gaps between the powder; and (iv) repeating steps (i) to (iii) to form successive layers; and wherein substantially void-free regions are formed in the article where the liquid reagent has been applied to the powder.