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1. (WO1999005571) SEDIMENTATION STABILIZED RADIATION-CURABLE FILLED COMPOSITIONS

Pub. No.:    WO/1999/005571    International Application No.:    PCT/EP1998/004318
Publication Date: Fri Feb 05 00:59:59 CET 1999 International Filing Date: Sun Jul 12 01:59:59 CEST 1998
IPC: G03F 7/00
G03F 7/027
G03F 7/075
Applicants: CIBA SPECIALTY CHEMICALS HOLDING INC.
Inventors: MELISARIS, Anastasios, Panayiotis
PANG, Thomas, Hsing
Title: SEDIMENTATION STABILIZED RADIATION-CURABLE FILLED COMPOSITIONS
Abstract:
The present invention relates to a process for the production of three-dimensional articles by stereolithography using a radiation-curable composition containing a mixture of at least one cationically polymerizable compound and/or at least one free radical polymerizable compound, at least one filler material, at least one photoinitiator for cationic and/or radical polymerizations and at least one antisedimentation agent. An organic viscosity stabilizer material soluble in the base resin may optionally be brought into contact with the composition. A filler material can be introduced in the composition in an effective amount sufficient to at least delay or prevent a significant viscosity increase. The present invention also relates to cured articles resulting from said processes and a process for preparing said compositions.