US 12,257,821 B2
Radio-wave anti-reflection sheet, tape and vehicle member
Masataka Shinagawa, Niiza (JP); Keiichiro Horikoshi, Yamagata (JP); Koji Hishitani, Tokyo (JP); and Masaaki Takeda, Sagamihara (JP)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 18/567,917
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jun. 16, 2022, PCT No. PCT/IB2022/055604
§ 371(c)(1), (2) Date Dec. 7, 2023,
PCT Pub. No. WO2023/275651, PCT Pub. Date Jan. 5, 2023.
Claims priority of provisional application 63/216,625, filed on Jun. 30, 2021.
Prior Publication US 2024/0262076 A1, Aug. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 5/32 (2006.01); B32B 5/18 (2006.01); B32B 7/02 (2019.01); B32B 7/06 (2019.01); B32B 7/12 (2006.01); B32B 27/06 (2006.01); B32B 27/36 (2006.01)
CPC B32B 5/32 (2013.01) [B32B 5/18 (2013.01); B32B 7/02 (2013.01); B32B 7/06 (2013.01); B32B 7/12 (2013.01); B32B 27/065 (2013.01); B32B 27/365 (2013.01); B32B 2264/101 (2013.01); B32B 2264/2032 (2020.08); B32B 2266/0242 (2013.01); B32B 2307/212 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7376 (2023.05); B32B 2307/748 (2013.01); B32B 2405/00 (2013.01); B32B 2605/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A vehicle member, comprising:
a multilayer body portion comprising a first layer disposed between second and third layers, the first layer having a lower density than each of the second and third layers; and
a radio-wave anti-reflection sheet, comprising:
a substantially non-tacky first major surface and an opposing substantially tacky second major surface;
a first polymeric foam layer disposed between the first and second major surfaces and having a thickness from 0.05 to 3.0 mm and a density from 0.20 to 0.90 g/cm3; and
a second polymeric foam layer disposed between the second major surface and the first polymeric foam layer and having a thickness from 0.05 to 3.0 mm and a density greater than 0.10 g/cm3 and less than the density of the first polymeric foam layer,
wherein the second major surface of the radio-wave anti-reflection sheet is disposed on, and bonded to, an outermost major surface of the multilayer body portion, and
wherein the radio-wave anti-reflection sheet reduces a reflection of radio waves having a frequency in a range of 60 to 90 GHz and substantially normally incident on the multilayer body portion by at least 3 dB.