US 12,459,244 B2
Molded parts with reduced microwave reflections and transmission
Franciscus Petrus Maria Mercx, Bergen op Zoom (NL); and Yapeng Fang, Shanghai (CN)
Assigned to SHPP Global Technologies B.V., Bergen op Zoom (NL)
Appl. No. 18/832,977
Filed by SHPP GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
PCT Filed Jan. 23, 2023, PCT No. PCT/IB2023/050545
§ 371(c)(1), (2) Date Jul. 25, 2024,
PCT Pub. No. WO2023/144679, PCT Pub. Date Aug. 3, 2023.
Claims priority of application No. 22153476 (EP), filed on Jan. 26, 2022.
Prior Publication US 2025/0100258 A1, Mar. 27, 2025
Int. Cl. B32B 27/20 (2006.01); B32B 7/02 (2019.01); B32B 7/12 (2006.01); B32B 27/06 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01)
CPC B32B 27/20 (2013.01) [B32B 7/02 (2013.01); B32B 7/12 (2013.01); B32B 27/065 (2013.01); B32B 27/308 (2013.01); B32B 27/36 (2013.01); B32B 2264/108 (2013.01); B32B 2307/202 (2013.01); B32B 2307/204 (2013.01); B32B 2307/7376 (2023.05)] 11 Claims
OG exemplary drawing
 
1. A dual-layer part consisting of:
a first layer having a thickness greater than 0.8 mm, wherein the first layer consists of a first polymer composition consisting of at least a first polymer and from about 0.1 wt. % to about 30 wt. % of a first electrically conductive carbon-based filler component;
a second layer disposed adjacent a surface of the first layer, wherein the second layer consists of a second polymer composition consisting of at least a second polymer and from about 0.01 wt. % to about 3 wt. % of a second electrically conductive carbon-based filler component,
wherein a ratio of a thickness of the first layer to the second layer is from 1:1 to 20:1,
wherein the first electrically conductive carbon-based filler component consists of a different filler or combination of fillers than the second electrically conductive carbon-based component,
wherein the dual-layer part exhibits a percent reflected power measured in transmission mode of less than 15% and a percent transmitted power less than 6% when observed according to a Free Space method at frequencies of from about 77 GHz to 81 GHz when the dual layer part is oriented such that microwave radiation is incident to the second layer of the dual-layer part,
wherein the dielectric constant (Dk) of the second layer is 2 to 5 and wherein the ratio of a Dk of the second layer to a Dk of the first layer (Dk2nd layer/DK1st layer) is from 0.2 to 0.6 when tested on molded samples of the first polymer of the first layer and the second polymer of the second layer respectively using a split post dielectric resonator (SPDR) and network analyzer at fixed frequencies, and
wherein the combined weight percent value of all components does not exceed 100 wt. %, and all weight percent values are based on the total weight of the first or second polymer compostion.