Process for making three-dimensional articles by stereolithography
First Claim
1. A process for the production of three-dimensional articles by stereolithography comprising polymerizing sequential layers of a radiation-curable composition comprising a mixture of a cationically curing compound and a free-radical curing compound, at least one filler material and at least one photoinitiator for polymerization, to form a three dimensional article in which benzyl-N,N-dimethylamine is brought into contact with the composition at a concentration of 5 to 5000 ppm to delay or prevent a significant increase in viscosity of the overall composition.
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Abstract
The present invention relates to a process for the production of three-dimensional articles by stereolithography using a radiation-curable composition having at least one cationically polymerizable compound and/or at least one free radical polymerizable compound, at least one filler material and at least one photoinitiator for cationic and/or radical polymerization. An organic viscosity stabilizer material is brought into contact with the composition to substantially delay or prevent undesirable viscosity increase and subsequently premature polymerization. A filler material is added to the composition in an effective amount to at least delay or prevent a significant increase in viscosity and polymerization.
33 Citations
22 Claims
- 1. A process for the production of three-dimensional articles by stereolithography comprising polymerizing sequential layers of a radiation-curable composition comprising a mixture of a cationically curing compound and a free-radical curing compound, at least one filler material and at least one photoinitiator for polymerization, to form a three dimensional article in which benzyl-N,N-dimethylamine is brought into contact with the composition at a concentration of 5 to 5000 ppm to delay or prevent a significant increase in viscosity of the overall composition.
- 6. A process for the production of three-dimensional articles by stereolithography comprising polymerizing sequential layers of a radiation-curable composition comprising a mixture of at least one radiation polymerizable compound, at least one filler material selected from sodium silicate, potassium silicate, calcium silicate, aluminum silicate, aluminum oxide, alumina trihydrate and mixtures thereof in an amount effective to delay or prevent a significant viscosity increase and at least one photoinitiator for polymerization to form a three-dimensional article.
- 16. A process for the production of three-dimensional articles by stereolithography comprising polymerizing sequential layers of a radiation-curable composition comprising a mixture of at least one cationically polymerizable compound, and/or at least one free radically polymerizable compound, at least one filler material having a pH value equal to or greater than about 9 and at least one photoinitiator for cationic and/or radical polymerizations to form a three-dimensional article.
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22. A process for the production of three-dimensional articles by stereolithography comprising polymerizing sequential layers of a curable composition comprising a mixture of a cationically curing compound and a free-radical curing compound, at least one filler material and at least one initiator for polymerization to form a three-dimensional article, in which a sterically hindered tertiary benzyl-N,N'"'"'-amine or aryl-N,N'"'"'-amine at a concentration of 5 to 1000 ppm is brought into contact with the composition to delay or prevent a significant increase in viscosity of the overall composition.
Specification