Elastomeric additive manufacturing composition
A composition useful for additive manufacturing is comprised of a thermoplastic elastomer blended with an aliphatic polyketone, wherein the thermoplastic elastomer is a continuous phase having dispersed therein separated domains of polyketone. The composition is useful for additive printing methods employing heating and extrusion of the composition to form extrudates that are printed an article comprised of fused layers of the composition. The composition facilitates the formation of extrusion based elastomeric additive manufactured articles.
1. A composition comprising:
a thermoplastic elastomer blended with an aliphatic polyketone, wherein the thermoplastic elastomer is a continuous phase having dispersed therein separated domains of polyketone.
2. The composition of claim 1 , wherein the thermoplastic elastomer is a styrenic thermoplastic elastomer, polyether block amide elastomer or combination thereof.
3. The composition of claim 1 , wherein the polyketone is present in an amount of about 1% to 25% by weight of the composition.
4. The composition of claim 2 , wherein the styrenic thermoplastic elastomer is a block copolymer that has a form that is either A-B-A or A-B-A-B-A, where A is a vinyl aromatic polymer block and B is a conjugated diene block.
5. The composition of claim 2 , wherein the styrenic thermoplastic elastomer is a styrene-(ethylene-butylene)-styrene (SEBS) thermoplastic elastomer.
6. The composition of claim 1 , wherein the polyketone is present in an amount of 1% to 15% by weight of the polyketone and thermoplastic elastomer.
7. A filament comprising the composition of claim 1 .
8. The composition of claim 7 , wherein the filament has a diameter of about 1 millimeter to about 3 millimeters.
9. The composition of claim 1 further comprising a friction modifier.
10. The composition of claim 9 , wherein the friction modifier is a stearate.
11. The composition of claim 1 , wherein the thermoplastic elastomer is a polyether block amide copolymer.
12. A method to form an additive manufactured article comprising:
(i) heating and extruding the composition of claim 1 through a print head to form an extrudate, and,
(ii) controllably depositing the extrudate into multiple fused layers to form the additive manufactured article.
13. The method of claim 12 wherein the extruding is by a 3D printer having a Bowden tube.
14. The method of claim 12 , wherein the composition is in the form of a filament having a diameter of about 0.5 millimeter to 3 millimeters.
15. An additive manufactured article comprising a plurality of layers fused or adhered together, wherein at least two layers are comprised of a composition comprising a thermoplastic elastomer blended with an aliphatic polyketone, wherein the thermoplastic elastomer is a continuous phase having dispersed therein separated domains of polyketone.
16. The article of claim 15 , wherein, the polyketone is present in an amount of 1% to 25% by weight of the thermoplastic elastomer and polyketone.
17. The article of claim 16 , wherein the thermoplastic elastomer is comprised of one or more of a styrene-(butadiene)-styrene (SBS), styrene-isoprene-styrene (SIS), styrene isoprene butylene styrene (SIBS), and/or styrene-(ethylene-butylene)-styrene (SEBS) or polyether block amide copolymer (PEBA).
18. The article of claim 15 , wherein the layers comprised of the composition comprising the thermoplastic elastomer blended with the aliphatic polyketone are is further comprised of a friction modifier.
19. The article of claim 18 , wherein the layers are further comprised of a filler.
20. The article of claim 15 , wherein the article is formed by fused filament fabrication.