Compositions and methods for use in three dimensional model printing
A radiation curing composition suitable for building a three-dimensional object by a solid freeform method is disclosed. The composition includes one or more mono-functional monomers where a respective polymer has a Glass Transition Temperature higher than about 60° C., one or more di-functional oligomers where a respective polymer has a Glass Transition Temperature lower than about 40° C. and a phase separation inducing component. The phase separation may be induced during curing, resulting in a non-clear cured material having an improved impact strength and higher elongation, when compared to similar compositions without a phase separation including component.
1. A radiation curing composition suitable for building a three dimensional object by a solid freeform method, the composition comprising:
one or more meth(acrylic)mono-functional monomers where a respective polymer has a Glass Transition Temperature higher than about 60° C.;
one or more meth(acrylic)di-functional oligomers where a respective polymer has a Glass Transition Temperature lower than about 40° C.; and
an acrylated silicon oligomer,
wherein the concentration of said one or more meth(acrylic)mono-functional monomers is at least 20% by weight relative to the total weight of the composition and the concentration of said one or more meth(acrylic)di-functional oligomers is at least 20% by weight relative to the total weight of the composition; and
wherein the composition has a viscosity of about 50-500cps at ambient temperature.
2. The composition of claim 1 , wherein the amount of the silicon oligomer is about 5% by weight relative to the total weight of the composition.
3. The composition of claim 1 , wherein upon curing the composition results in a material having improved impact strength relative to a similar composition without the acrylated silicon oligomer.
4. The composition of claim 1 , wherein said the acrylated silicon oligomer promotes phase separation during curing of said composition.
5. The composition of claim 1 , wherein the composition has a viscosity lower than 20 cps at a temperature higher than the ambient temperature and after curing, the composition results in a solid form.
6. The composition of claim 1 , further comprising a molecule having one or more epoxy substituents, a molecule having one or more vinyl ether substituents, vinylcaprolactam, vinylpyrolidone, or any combination thereof.
7. The composition of claim 1 , further comprising a photo-initiator.
8. The composition of claim 1 , further comprising a sulfur-containing component.
9. The composition of claim 8 , wherein said sulfur-containing component is beta mercaptopropionate, mercaptoacetate, alkane thiols or any combination thereof.
10. The composition of claim 1 , further comprising at least one pigment and at least one dispersant.
11. The composition of claim 1 , further comprising a dye.
12. The composition according to claim 1 , wherein the Glass Transition Temperature of the mono-functional monomer is higher than 70° C.
13. The composition of claim 1 , wherein the viscosity at ambient temperature is above 80 cps.
14. The composition of claim 1 , wherein viscosity at ambient temperature is about 300 cps.
15. The composition of claim 1 , wherein the di-functional oligomer is urethane-acrylate oligomer or urethane methacrylate oligomer.