US 12,454,094 B2
Additive manufacturing process using a building material that contains metal-oxide coated mica
Derk Wandner, Odenthal (DE); Ting Liu, Cologne (DE); and Jonas Kuenzel, Leverkusen (DE)
Assigned to Stratasys Inc., Eden Prairie, MN (US)
Appl. No. 17/288,347
Filed by Stratasys, Inc., Eden Prairie, MN (US)
PCT Filed Oct. 21, 2019, PCT No. PCT/EP2019/078477
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/083800, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 18202734 (EP), filed on Oct. 26, 2018.
Prior Publication US 2021/0379817 A1, Dec. 9, 2021
Int. Cl. B29C 64/118 (2017.01); B33Y 70/00 (2020.01); C08K 3/34 (2006.01); C08K 5/5313 (2006.01); C08L 23/26 (2006.01); C08L 69/00 (2006.01); B29K 23/00 (2006.01); B29K 69/00 (2006.01)
CPC B29C 64/118 (2017.08) [B33Y 70/00 (2014.12); C08K 3/34 (2013.01); C08K 5/5313 (2013.01); C08L 23/26 (2013.01); C08L 69/00 (2013.01); B29K 2023/06 (2013.01); B29K 2023/10 (2013.01); B29K 2023/18 (2013.01); B29K 2069/00 (2013.01)] 11 Claims
 
1. A method of producing an article, comprising producing the article by means of an additive manufacturing method from a build material,
wherein
the build material, based on the total weight of the build material, comprises
A) ≥50% by weight to ≤98.5% by weight of aromatic polycarbonate,
B) ≥0.8% by weight to ≤3.0% by weight of interference pigment and/or pearlescent pigment from a group of metal oxide-coated micas and
C) ≥0.05% by weight to ≤3% by weight of anhydride-modified α-olefin polymer,
where the sum total of the percentages by weight of A), B) and C) is ≤100% by weight,
wherein the build material A) comprises a polycarbonate having a weight-average molecular weight Mw of ≥10 000 to ≤40 000 g/mol, determined by gel permeation chromatography in methylene chloride at 25° C. against polycarbonate standards.
 
10. A method of producing an article, comprising producing the article by means of an additive manufacturing method from a build material,
wherein
the build material, based on the total weight of the build material, comprises
A) ≥50% by weight to ≤98.5% by weight of aromatic polycarbonate,
B) ≥0.8% by weight to ≤3.0% by weight of interference pigment and/or pearlescent pigment from a group of metal oxide-coated micas and
C) ≥0.05% by weight to ≤3% by weight of anhydride-modified a-olefin polymer,
where the sum total of the percentages by weight of A), B) and C) is ≤100% by weight,
wherein the production of the article by the additive manufacturing method comprises the steps of:
-applying a filament of an at least partly molten build material to a carrier, such that a layer of the build material is obtained, corresponding to a first selected cross section of the article;
-applying a filament of the at least partly molten build material to a previously applied layer of the build material, such that a further layer of the build material is obtained, which corresponds to a further selected cross section of the article and which is bonded to the layer applied beforehand;
-repeating the step of applying a filament of the at least partly molten build material to a previously applied layer of the build material until the article has been formed.