Additive manufacturing break away support material

1. An additive manufactured article comprising at least two layers of a composition, comprising:

a blend of an elastomer toughened styrenic polymer having discreet domains of polymerized conjugate diene dispersed within a styrenic matrix; and

a vinyl aromatic-maleic anhydride copolymer,

wherein the elastomer toughened styrenic polymer is present in an amount of 25% to 50% by weight of the composition and the vinyl aromatic-maleic anhydride copolymer is present in an amount of 20% to 45% by weight of the composition.

2. The additive manufactured article of claim 1 , wherein the article is formed by fused filament fabrication and the composition is a support material.

3. A method of forming an additive manufactured object comprising:

heating and extruding a composition comprising a blend of an elastomer toughened styrenic polymer having discreet domains of polymerized conjugate diene dispersed within a styrenic matrix and a vinyl aromatic-maleic anhydride copolymer through a 3d print extrusion nozzle to form a support extrudate and contemporaneously heating and

extruding a build material through a second 3d print extrusion nozzle to form a build extrudate, and,

depositing the support extrudate and build extrudate such that multiple layers are controllably deposited and fused forming an additive manufactured article, wherein the support extrudate supports a portion of the build material.

4. The method of claim 3 further comprising mechanically breaking away the support extrudate from the build material after cooling of the additive manufactured article.

5. The method of claim 3 , wherein the build material is a polyamide or polyester.

6. The method of claim 3 , wherein the extrusion is by fused filament fabrication, or powder or pellet extrusion.

7. The method of claim 3 , wherein the composition is a pellet or powder.

8. The method of claim 3 , wherein the composition comprises the elastomer toughened styrenic polymer is present in an amount of 25% to 50% by weight of the composition and the vinyl aromatic-maleic anhydride copolymer is present in an amount of 20% to 45% by weight of the composition.

9. The method of claim 3 , wherein the composition is extruded from a twin screw extruder at a temperature of 200 to 210 degrees Celsius.

10. The method of claim 3 , wherein the composition is extruded through a nozzle having a diameter of about 0.1 mm to about 3 mm.

11. The method of claim 3 , wherein the build materials comprises a polyester or a polyamide.

12. The method of claim 6 , wherein the extrusion is fused filament fabrication that utilizes the composition in a form of one or more filaments.

13. The method of claim 12 , wherein the one or more filaments have a diameter of about 1 millimeter to about 3 millimeters.

14. The method of claim 12 , wherein the fused filament fabrication employs a direct drive extruder or a Bowden Extruder.

15. The method of claim 12 , wherein the fused filament fabrication employs a Bowden Extruder.

16. The method of claim 3 , wherein the elastomer toughened styrenic polymer is a copolymer of styrene and a conjugated diene and optionally an unsaturated nitrile.

17. The method of claim 16 , wherein the elastomer toughened styrenic polymer is a copolymer of styrene and butadiene.

18. The method of claim 3 , wherein the composition further comprises a copolymer of an acrylate and a vinyl aromatic monomer.

19. The method of claim 18 , wherein the acrylate-vinyl aromatic copolymer is further comprised of a conjugated diene, unsaturated nitrile or combination thereof.

20. The method of claim 19 , wherein the acrylate-vinyl aromatic copolymer is a copolymer of methyl methacrylate-acrylonitrile-butadiene-styrene (MABS).