US 11,869,471 B2
Composite sandwich panel comprising honeycomb core and layer of damping or attenuation material
Christophe Chaut, Molsheim (FR); Jerome Matrat, Molsheim (FR); and Laura Sivec, Romeo, MI (US)
Assigned to Zephyros, Inc., Romeo, MI (US)
Appl. No. 16/493,639
Filed by Zephyros, Inc., Romeo, MI (US)
PCT Filed Mar. 13, 2018, PCT No. PCT/EP2018/056244
§ 371(c)(1), (2) Date Sep. 12, 2019,
PCT Pub. No. WO2018/167062, PCT Pub. Date Sep. 20, 2018.
Claims priority of application No. 17160699 (EP), filed on Mar. 13, 2017; and application No. 17180865 (EP), filed on Jul. 12, 2017.
Prior Publication US 2020/0005755 A1, Jan. 2, 2020
Int. Cl. B32B 3/12 (2006.01); G10K 11/165 (2006.01); B01J 20/28 (2006.01); B32B 15/08 (2006.01)
CPC G10K 11/165 (2013.01) [B01J 20/28026 (2013.01); B32B 3/12 (2013.01); B32B 15/08 (2013.01); B32B 2255/26 (2013.01); B32B 2307/56 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A reinforcement element comprising cell walls forming an array of hollow columnar cells;
wherein each columnar cell comprises a cavity which is surrounded by cell walls;
wherein the reinforcement element comprises at least one coated columnar cell and at least one uncoated columnar cell, both comprising a cavity which is surrounded by cell walls, wherein an inner surface of a cell wall towards the cavity of the at least one coated columnar cell is at least partially covered with a layer of an epoxy-based thermoset damping or attenuation material; and
wherein the damping or attenuation material does not completely fill the cavity of the coated columnar cell, but forms a layer on the inner surface of the cell wall towards the cavity of the coated columnar cell, the layer having an average thickness of 0.5 mm to 5 mm;
wherein the layer is disposed on the inner surface of the cell wall in a circumferential collar-like arrangement and the epoxy-based thermoset damping or attenuation material contains 8 to 20 wt.-% elastomeric particles having a core-shell structure, further wherein a core of the core-shell structure having a core glass transition temperature of less than 0 degrees Celsius and a shell having a shell glass transition temperature of greater than 50 degrees Celsius; and
wherein at least 50% of the total number of columnar cells contained in the reinforcement element are coated columnar cells and further wherein the cavity of the at least one uncoated columnar cell has a volume VO and the cavity of the at least one coated columnar cell has a volume VC, and a relative ratio of VC to VO is 0.05 to 0.95.