US 12,257,767 B2
Polypropylene for extrusion additive manufacturing
Carl Schirmeister, Denzlingen (DE); Karsten Schmitz, Hofheim/Ts. (DE); Yannic Kessler, Kriftel (DE); Rainer Köhler, Pegnitz (DE); Erik Licht, Mainz (DE); Shahram Mihan, Bad Soden (DE); Jürgen Rohrmann, Kelkheim (DE); Dieter Langenfelder, Niedernhausen (DE); Rolf Muelhaupt, Freiburg (DE); and Timo Hees, Freiburg (DE)
Assigned to Basell Polyolefine GmbH, Wesseling (DE); and Albert-Ludwigs-Universität Freiburg, Freiburg (DE)
Appl. No. 17/766,442
Filed by Basell Polyolefine GmbH, Wesseling (DE); and Albert-Ludwigs-Universität Freiburg, Freiburg (DE)
PCT Filed Sep. 28, 2020, PCT No. PCT/EP2020/077034
§ 371(c)(1), (2) Date Apr. 4, 2022,
PCT Pub. No. WO2021/069242, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 19201694 (EP), filed on Oct. 7, 2019.
Prior Publication US 2024/0051221 A1, Feb. 15, 2024
Int. Cl. B29C 64/118 (2017.01); B29K 23/00 (2006.01); B29K 25/00 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C08K 7/14 (2006.01); C08L 23/0807 (2025.01); C08L 23/12 (2006.01); C08L 23/16 (2006.01); C08L 25/08 (2006.01); C08L 51/06 (2006.01); C08L 53/00 (2006.01)
CPC B29C 64/118 (2017.08) [C08K 7/14 (2013.01); C08L 23/0815 (2013.01); C08L 23/12 (2013.01); C08L 23/16 (2013.01); C08L 25/08 (2013.01); C08L 51/06 (2013.01); C08L 53/00 (2013.01); B29K 2023/08 (2013.01); B29K 2023/12 (2013.01); B29K 2023/14 (2013.01); B29K 2025/08 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); C08K 2201/004 (2013.01); C08K 2201/005 (2013.01); C08L 2205/22 (2013.01); C08L 2207/02 (2013.01); C08L 2207/04 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A process for producing an article with an extrusion-based additive manufacturing system comprising the step of:
extruding a flowable build material in the form of filament to produce strands, drops or beads, wherein the filament comprises a propylene polymer composition comprising:
A) from 20% to 60% by weight of a heterophasic propylene copolymer;
B) from 5% to 33% by weight of a propylene homopolymer or copolymer, wherein the copolymer contains up to 5% by weight of an alpha olefin selected from the group consisting of ethylene, 1-butene, 1-hexene and 1-octene;
C) from 2% to 15% by weight of an elastomeric block copolymer comprising styrene;
D) from 4% to 32% by weight of an elastomeric ethylene copolymer;
E) from 5% to 50% by weight of a glass material as filler; and
F) from 0.1% to 5% by weight of a compatibilizer,
wherein the amounts of components A), B), C), D), E) and F) are referred to the total weight of A), B), C), D), E) and F), which amounts to 100% and wherein the melt flow rate MFR at 230° C. with a load of 2.16 kg, according to ISO (International Organization for Standardization) 1133-2:2011, is at least 1.0 g/10 min.; and
fusing the strands, drops or beads to form the article.