Light-curable composition
A light-curable composition is provided which may be used as a photopolymerizable material in an additive manufacturing process. The additive manufacturing process involves heating the light-curable composition which has a viscosity at 20° C. of at least 20 Pa·s. The light-curable composition includes a photopolymerizable matrix material, at least one thermoplastic polymer dissolved therein, and at least one photoinitiator. Polycaprolactone or a derivative thereof is used as the dissolved thermoplastic polymer.
1. A light-curable composition configured to be used as a photopolymerizable material in an additive manufacturing process, the process comprising heating said light-curable composition which has a viscosity at 20° C. of at least 20 Pa·s, the light-curable composition comprising:
a photopolymerizable matrix material,
at least one thermoplastic polymer which essentially does not react with the photopolymerizable matrix material and does not participate in the polymerization process, and which is dissolved in the photopolymerizable matrix material, and
at least one photoinitiator;
wherein polycaprolactone or a derivative thereof is used as said dissolved thermoplastic polymer.
2. The light-curable composition according to claim 1 , wherein said polycaprolactone or said derivative thereof has a number average molecular weight of at least 25,000 g/mol or at least 50,000 g/mol.
3. The light-curable composition according to claim 2 , wherein said polycaprolactone or said derivative thereof has a number average molecular weight M n of at least 70,000 g/mol.
4. The light-curable composition according to claim 1 , wherein said polycaprolactone or said derivative thereof is dissolved in said photopolymerizable matrix material at an amount of 2 to 30 wt %, based on 100 wt % of said matrix and said thermoplastic polymer taken together.
5. The light-curable composition according to claim 4 , wherein said polycaprolactone or said derivative thereof is dissolved in said photopolymerizable matrix material at an amount of 5 to 15 wt %, based on 100 wt % of said matrix and said thermoplastic polymer taken together.
6. The light-curable composition according to claim 5 , wherein said polycaprolactone or said derivative thereof is dissolved in said photopolymerizable matrix material at an amount of 10 wt %, based on 100 wt % of said matrix and said thermoplastic polymer taken together.
7. The light-curable composition according to claim 1 , wherein polycaprolactone is used as said dissolved thermoplastic polymer.
8. The light-curable composition according to claim 1 , wherein said photopolymerizable matrix material comprises at least one monofunctional reactive diluent and at least one di- or higher functional crosslinker.
9. The light-curable composition according to claim 8 , wherein one or more (meth)acrylates is/are used as said reactive diluent and/or crosslinker.
10. The light-curable composition according to claim 8 , wherein said at least one reactive diluent accounts for 30 to 80 wt % and said at least one crosslinker accounts for 70 to 20 wt % of said polymerizable matrix material.
11. The light-curable composition according to claim 8 , wherein said at least one reactive diluent has a viscosity at 20° C. of not more than 0.1 Pa·s.
12. The light-curable composition according to claim 8 , wherein an oligomer having a number average molecular weight M n of at least 400 g/mol is used as said crosslinker.
13. The light-curable composition according to claim 1 , wherein the composition has a viscosity at 20° C. of at least 50 Pa·s.
14. The light-curable composition according to claim 13 , wherein the composition has a viscosity at 20° C. of at least 80 Pa·s.
15. The light-curable composition according to claim 1 , wherein the light-curable composition comprises at least one further component selected from the group consisting of thermal initiators, dyes, fillers, and modifiers.
16. The light-curable composition according to claim 8 , wherein an oligomer having a number average molecular weight M n of at least 1,000 g/mol is used as said crosslinker.
17. The light-curable composition according to claim 8 , wherein an oligomer having a number average molecular weight M n of at least 5,000 g/mol is used as said crosslinker.
18. The light-curable composition according to claim 8 , wherein an oligomer having a number average molecular weight M n of at least 10,000 g/mol is used as said crosslinker.