US 11,929,054 B2
Soundproof material
Norikazu Matsumoto, Kyoto (JP); Shoko Sakai, Kyoto (JP); Kenji Ohtani, Kyoto (JP); and Teruhisa Miyata, Kyoto (JP)
Assigned to MAXELL, LTD., Kyoto (JP)
Appl. No. 17/260,191
Filed by MAXELL, LTD., Kyoto (JP)
PCT Filed Jul. 26, 2019, PCT No. PCT/JP2019/029506
§ 371(c)(1), (2) Date Jan. 13, 2021,
PCT Pub. No. WO2020/026994, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-146130 (JP), filed on Aug. 2, 2018.
Prior Publication US 2021/0272545 A1, Sep. 2, 2021
Int. Cl. G10K 11/168 (2006.01); B32B 5/02 (2006.01)
CPC G10K 11/168 (2013.01) [B32B 5/022 (2013.01); B32B 2307/102 (2013.01); B32B 2307/732 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A soundproof material comprising:
a surface cover layer composed of a fiber material;
a back-surface layer laminated onto the surface cover layer, and composed of a porous material with voids interconnected with each other; and
a joining layer laminated between the surface cover layer and the back-surface layer, and composed of a joining material,
wherein:
the fiber material has an average fiber diameter of 1 to 10 μm and an air-permeation volume of 5 to 200 cm3/cm2·sec,
the joining layer has a joint area percentage of 50 to 95% with respect to an entire surface where the surface cover layer and the back-surface layer face each other, and
the surface cover layer has a basis weight from 5 to 300 g/m2.