Compositions and methods for use in three dimensional model printing

1. A composition suitable for support in building a three dimensional object, said composition comprising:

at least one curable component,

at least one non-curable component, said non-curable component being a polyol or glycol compound,

wherein none of said non-curable components is reactive with any of said curable components;

a surface additive for reducing surface tension; and

a stabilizer;

wherein all components of the composition are either miscible or soluble in the composition and said composition has a first viscosity of 100-500 cps at ambient temperature and a second viscosity of <20 cps at a temperature higher than said ambient temperature;

wherein, after irradiation, said composition results in a solid, a semi solid or a gel material capable of dissolving or swelling upon exposure to water, to an alkaline or acidic water solution or to a water detergent solution.

2. The composition according to claim 1 , further comprising water.

3. The composition according to claim 1 , further comprising at least one photoinitiator.

4. The composition according to claim 3 , wherein said photo-initiator is a free radical photo-initiator, a cationic photo-initiator, or any combination thereof.

5. The composition according to claim 1 , wherein said curable component is a (meth)acrylic component.

6. The composition according to claim 5 , wherein said (meth)acrylic component is a (meth)acrylic monomer, a (meth)acrylic oligomer, a (meth)acrylic crosslinker or a combination thereof.

7. The composition according to claim 5 , wherein said (meth)acrylic component is a (meth)acrylated urethane oligomer derivative of polyethylene glycol, a partially (meth)acrylated polyol oligomer, an (meth)acrylated oligomer having hydrophilic substituents, polyethylene glycol mono or di (meth)acrylated, acrylamide, acryloyl morpholine or any combination thereof.

8. The composition according to claim 7 , wherein said hydrophilic substituents are acidic substituents, amino substituents, hydroxy substituents, ionic substituents or any combination thereof.

9. The composition according to claim 1 , further comprising a molecule having one or more vinyl ether substituents.

10. The composition according to claim 1 , wherein said non-curable component is polyethylene glycol, methoxypolyethylene glycol, glycerol, ethoxylated polyol, propylene glycol or any combination thereof.

11. The composition according to claim 1 , further comprising a sulfur-containing component being beta mercaptopropionate, mercaptoacetate or alkane thiol.

12. The composition according to claim 1 , further comprising a low molecular weight polymer.

13. The composition according to claim 1 , further comprising a pigment, a dye or a combination thereof.

14. The composition according to claim 13 , wherein said pigment is a white pigment, an organic pigment, an inorganic pigment, a metal pigment or a combination thereof.

15. The composition according to claim 1 , wherein said first viscosity is <120 cps.

16. The composition according to claim 1 , further comprising a component able to produce gas upon exposure to water or to an alkaline or acidic water solution.

17. The composition according to claim 16 , wherein said component is sodium bicarbonate, calcium carbonate or a combination thereof.

18. The composition according to claim 1 , further comprising a low molecular weight polymer.

19. A composition suitable for support in building a three dimensional object, said composition comprising:

at least one curable component,

at least one non-curable component, said non-curable component being a non-water miscible compound,

wherein none of said non-curable components is reactive with any of said curable components;

a surface additive for reducing surface tension; and

a stabilizer;

wherein all components of the composition are either miscible or soluble in the composition and said composition has a first viscosity of 100-500 cps ambient temperature and a second viscosity of <20 cps at a higher than ambient temperature;

wherein, after irradiation, said composition results in a solid, a semi solid or a qel material.

20. The composition according to claim 19 , further comprising at least one photoinitiator.

21. The composition according to claim 20 , wherein said photo-initiator is a free radical photo-initiator, a cationic photo-initiator, or any combination thereof.

22. The composition according to claim 19 , wherein said curable component is a (meth)acrylic component.

23. The composition according to claim 22 , wherein said (meth)acrylic component is a (meth)acrylic monomer, a (meth)acrylic oligomer, a (meth)acrylic crosslinker or a combination thereof.

24. The composition according to claim 19 , wherein said non-water miscible compound is paraffin oil.

25. The composition according to claim 19 , further comprising a molecule having one or more vinyl ether substituents.

26. The composition according to claim 19 , further comprising a sulfur-containing component being beta mercaptopropionate, mercantoacetate or alkane thiol.

27. The composition according to claim 19 , further comprising a pigment, a dye or a combination thereof.

28. The composition according to claim 27 , wherein said pigment is a white pigment, an organic pigment, an inorganic pigment, a metal pigment or a combination thereof.

29. The composition according to claim 19 , wherein said first viscosity is <120 cps.

30. The composition according to claim 19 , further comprising a component able to produce gas upon exposure to water or to an alkaline or acidic water solution.

31. The composition according to claim 30 , wherein said component is sodium bicarbonate, calcium carbonate or a combination thereof.

32. The composition according to claim 19 , wherein said solid, semi-solid or gel material is non-miscible in water.