US 12,305,021 B2
3D-printed elastic products reinforced by means of continuous fibres and having asymmetrical elastic properties
Dirk Achten, Leverkusen (DE); Nicolas Degiorgio, Krefeld (DE); Jonas Kuenzel, Leverkusen (DE); and Thomas Buesgen, Leverkusen (DE)
Assigned to STRATASYS, INC., Eden Prairie, MN (US)
Appl. No. 17/273,343
Filed by STRATASYS, INC., Eden Prairie, MN (US)
PCT Filed Sep. 10, 2019, PCT No. PCT/EP2019/074030
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/053168, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 18194177 (EP), filed on Sep. 14, 2018.
Prior Publication US 2021/0324177 A1, Oct. 21, 2021
Int. Cl. C08K 7/14 (2006.01); B29C 64/118 (2017.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); C08L 21/00 (2006.01); C08L 75/04 (2006.01)
CPC C08K 7/14 (2013.01) [B33Y 80/00 (2014.12); C08L 21/00 (2013.01); C08L 75/04 (2013.01); B29C 64/118 (2017.08); B33Y 10/00 (2014.12)] 15 Claims
OG exemplary drawing
 
1. A fiber-reinforced, 3D-printed elastic product, comprising
a proportion by weight of ≥50% of a polymer having a number average molecular weight of ≥5000 g/mol, as measured by means of gel permeation chromatography, and
a proportion by weight of ≥0.5% and ≤20% of one or more fibers, the one or more fibers being a continuous fiber having an aspect ratio of ≥100 and a length of ≥10 cm and ≤1000 cm,
wherein the polymer comprises a thermoplastic elastomer,
wherein the product is at least partially produced by means of a Fused Filament Fabrication process,
wherein the product, in a region of fiber reinforcement and in a direction of a fiber symmetry axis, has a tensile modulus of ≥1.5 GPa as measured according to DIN EN ISO 527-1,
wherein the product, in the region of fiber reinforcement and perpendicular to the fiber symmetry axis, has a tensile modulus of ≤1.2 GPa as measured according to DIN EN ISO 527-1,
wherein the product, in the region of fiber reinforcement and perpendicular to the fiber symmetry axis, has a yield point of >5% as measured according to DIN EN ISO 527-1, and
wherein the thermoplastic elastomer is selected from the group consisting of thermoplastic copolyamides (TPA), thermoplastic copolyesters (TPC), olefin-based thermoplastic elastomers (TPO), styrene block copolymers (TPS), urethane-based thermoplastic elastomers (TPU), crosslinked olefin-based thermoplastic elastomers (TPV), polyvinyl chloride (PVC)-based thermoplastic elastomers, silicone-based thermoplastic elastomers, or a combination of at least two of these thermoplastic elastomers.