US 12,031,046 B2
Polypropylene polymers for powder bed fusion based additive manufacturing
Michelle K. Sing, Pittsburgh, PA (US); Hadi Mohammadi, Pittsburgh, PA (US); Moises Magalhaes Werlang, Pittsburgh, PA (US); Ana Paula de Azeredo, Pittsburgh, PA (US); Jacob Fallon, Pittsburgh, PA (US); Kevin Herrington, Pittsburgh, PA (US); and Collin Azinger, Pittsburgh, PA (US)
Assigned to BRASKEM AMERICA, INC., Philadelphia, PA (US)
Filed by BRASKEM AMERICA, INC., Philadelphia, PA (US)
Filed on Jul. 21, 2022, as Appl. No. 17/870,325.
Claims priority of provisional application 63/224,683, filed on Jul. 22, 2021.
Prior Publication US 2023/0038023 A1, Feb. 9, 2023
Int. Cl. B33Y 70/00 (2020.01); B29C 64/153 (2017.01); B33Y 10/00 (2015.01); C09D 11/037 (2014.01); C09D 11/108 (2014.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01)
CPC C09D 11/108 (2013.01) [B29C 64/153 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C09D 11/037 (2013.01); B29K 2023/14 (2013.01); B29K 2105/0032 (2013.01)] 29 Claims
 
1. A sinterable polymer composition, comprising:
a random copolymer of propylene and an olefinic comonomer, wherein the olefinic comonomer of the random copolymer is present in the random copolymer in an amount of from 2 to 10 wt %, relative to 100 wt % of the random copolymer,
at least one of a clarifier and a nucleator, and
at least one of a primary antioxidant, a secondary antioxidant, an acid scavenger, a peroxide, an enhanced IR energy absorber, a long-term heat agent, and a polyolefin elastomer,
wherein the sinterable polymer composition has:
a melt flow rate from 1 to 150 g/10 min (230° C./2.16 kg), measured according to ASTM D 1238,
a crystallization temperature, Tc, from 105 to 150° C., and
a xylene solubles content, XS, from 3% to 40%, measured according to ASTM D5492-17.