Loading patent…
OwnerEugene Valentine Sitzmann, Russell Frank Anderson +2inventors
InventorsEugene Valentine Sitzmann, Russell Frank Anderson, Darryl Keith Barnes, Ashwin B. Patel
Estimating the term…
Polymer precursor formulations suitable for stereolithography may be prepared from compositions containing vinyl ether functionalized compounds and epoxy functionalized compounds plus an effective mount of a cationic photoinitiator and an ultraviolet light-absorbing compound to provide a predetermined depth of cure. Preferably, the ultraviolet light-absorbing compound is anthracene or its derivatives. Anthracenes having pendant alkoxy groups are preferred for use with light wavelengths greater than 360 nm, particularly 9,10-dimethoxy-2-ethyl anthracene.
In the process of stereolithography in which a three-dimensional object is built up in successive layers by polymerizing cationically polymerizable monomers by the catalytic action of cationic photoinitiators activated by a moving beam of ultraviolet light, the improvement comprising adding as an ultraviolet light absorbing compound in quantities sufficient to provide a predetermined depth of cure and having the formula ##STR16## where:
Dependencies are inferred from the claim text.