US 11,917,802 B2
Conductive long fiber thermoplastic compounds for electromagnetic shielding
Raul Juan, San Mateo de Gallego (ES); Javier Puyalto, Barbastro (ES); Renlong Gao, Avon, OH (US); and David Sanchez, San Sebastian de los Reyes (ES)
Assigned to Avient Corporation, Avon Lake, OH (US)
Appl. No. 17/285,699
Filed by Avient Corporation, Avon Lake, OH (US)
PCT Filed Oct. 14, 2019, PCT No. PCT/US2019/056116
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2020/081451, PCT Pub. Date Apr. 23, 2020.
Claims priority of provisional application 62/746,129, filed on Oct. 16, 2018.
Prior Publication US 2021/0345529 A1, Nov. 4, 2021
Int. Cl. H05K 9/00 (2006.01)
CPC H05K 9/009 (2013.01) 24 Claims
OG exemplary drawing
 
1. A thermoplastic compound in the form of a pellet, the thermoplastic compound comprising:
(a) thermoplastic resin; and
(b) conductive fibers enveloped by the thermoplastic resin and distributed within the pellet such that each of at least 50% of the conductive fibers is substantially surrounded by the thermoplastic resin and thereby substantially separated from physical contact with any other of the conductive fibers;
wherein the pellet has a pellet length and each of the conductive fibers has a fiber length, and wherein the fiber length of each of at least a portion of the conductive fibers is substantially equivalent to the pellet length; and
wherein the thermoplastic compound, when molded at a thickness of about 3.2 mm, has an electromagnetic shielding effectiveness across a range of frequencies from about 0.5 GHz to about 2.0 GHz of at least about 60 dB according to ASTM D4935.