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1. (WO2019028201) TRANSLUCENT COC POLYMER COMPOUNDS FOR 3D PRINTING
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What is claimed is:

1. A build material during 3D printing comprising

(a) cyclic olefin copolymer having a heat deflection temperature HDT/B ((0.45 MPa) ISO Parts 1 and 2) of 125°C or less and

(b) impact modifier, other than cyclic olefin copolymer elastomer, capable of modifying the impact properties of the cyclic olefin copolymer; wherein the build material has a percentage Haze (ASTM DlOO) of less than about 55%, and a percentage Transmission (ASTM DlOO) of greater than about 85%.

2. The build material of Claim 1, wherein the cyclic olefin copolymer (COC) is a copolymer of cyclic olefin monomers with alkenes and wherein the heat deflection temperature HDT/B ((0.45 MPa) ISO Parts 1 and 2) ranges from about 75°C to about 125°C.

3. The build material of Claim 2, wherein the cyclic olefin copolymer is ethylene-norbornene copolymer which has a CAS No. of 26007-43-2.

4. The build material of Claim 3, wherein the ethylene-norbornene copolymer has the following structure:


wherein X ranges from about 40 wt.% to about 20 wt.% and wherein Y ranges from about 60 wt. % to about 80 wt. %.

5. The build material of Claim 3, wherein the heat deflection temperature HDT/B ((0.45 MPa) ISO Parts 1 and 2) is 75°C.

6. The build material of Claim 3, wherein the cyclic olefin copolymer has a weight average molecular weight (Mw) ranging from about 40,000 to about 130,000.

7. The build material of any one of Claims 1-6, wherein the impact modifier is selected from the group consisting of styrenic block copolymers, olefinic block copolymer, and combinations of them.

8. The build material of any one of Claims 1-7, wherein the build material further comprises optical brighteners, process aids, rheology modifiers, thermal and UV stabilizers, fluorescent and non-fluorescent dyes and pigments, radio-opaque tracers, conductive additives (both thermal and electrical), inductive heating additives, and non-silicone releases; and combinations of them.

9. The build material of Claim 7, wherein the styrenic block copolymer is selected from the group consisting of (1) a clear, branched block copolymer based on styrene and butadiene with bound styrene of 30% mass, (2) a clear, linear triblock copolymer based on styrene and ethylene/butylene with a polystyrene content of 57% and a controlled distribution S-E/B/S-S structure, and (3) combinations thereof.

10. A 3D printed polymer article comprising the build material of any one of Claims 1-9.

11. The 3D printed polymer article of Claim 10, wherein the build material further comprises optical brighteners, process aids, rheology modifiers, thermal and UV stabilizers, fluorescent and non-fluorescent dyes and pigments, radio-opaque tracers, conductive additives (both thermal and electrical), inductive heating additives, and non-silicone releases; and combinations of them.

12. The article of Claim 11, wherein the styrenic block copolymer is styrene-ethylene/butylene-styrene (SEBS).

13. A method of using the build material of Claim 1, comprising the step of 3D printing the build material of any one of Claims 1-9.

14. The method of Claim 13, wherein the build material further comprises optical brighteners, process aids, rheology modifiers, thermal and UV stabilizers, fluorescent and non-fluorescent dyes and pigments, radio-opaque tracers, conductive additives (both thermal and electrical), inductive heating additives, and non-silicone releases; and combinations of them.

15. The method of Claim 14, wherein the styrenic block copolymer selected from the group consisting of (1) a clear, branched block copolymer based on styrene and butadiene with bound styrene of 30% mass, (2) a clear, linear triblock copolymer based on styrene and ethylene/butylene with a polystyrene content of 57% and a controlled distribution S-E/B/S-S structure, and (3) combinations thereof.