COC polymer compounds for 3D printing

1. A method of using a build material during 3D printing comprising cyclic olefin copolymer having a heat deflection temperature HDT/B ((0.45 MPa) ISO 75, Parts 1 and 2) of 125° C. or less and an impact modifier, other than cyclic olefin copolymer elastomer, capable of modifying the impact properties of the cyclic olefin copolymer, wherein the impact modifier is selected from the group consisting of styrenic block copolymers, olefinic block copolymer, and combinations of them

comprising the step 3D printing the build material.

2. The method of claim 1 , 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.

3. The method of claim 1 , wherein the styrenic block copolymer is styrene-ethylene/butylene-styrene (SEBS).

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

5. The method of claim 1 , wherein the cyclic olefin copolymer is ethylene-norbornene copolymer which has a CAS No. of 26007-43-2.

6. The method of claim 5 , 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. %.

7. The method of claim 1 , wherein the heat deflection temperature HDT/B ((0.45 MPa) ISO 75 Parts 1 and 2) is 75° C.

8. The method of claim 1 , wherein the cyclic olefin copolymer has a weight average molecular weight (Mw) ranging from about 40,000 to about 130,000.