Photoformable Composition

A method for fabricating an integral three-dimensional object from layers of a photoformable composition has been presented (12). 

A semi-permeable film can be used, which is impermeable to the photoformable composition but is permeable to a deformable-coating-mixture that is non-wetting and immiscible with the photoformable composition. 

The deformable-coating-mixture passes through the membrane by diffusion and forms a thin, slippery surface on the photoformable composition side of the membrane, thereby eliminating any adhesion forces caused by chemical, mechanical or hydrogen bonds. 

Contacting an interface with a gaseous oxygen-containing 

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Allowing gaseous atmosphere to permeate through the film and also partially into a photoformable-composition layer,... 

J.A. Lawton and J.T. Adams, Method for fabricating an integral three-dimensional object from layers of a photoformable composition, US Patent 5122 441, assigned to E. I. Du Pont de Nemours and Company (Wilmington, DE), June 16,1992. 

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