US 12,459,235 B2
Asymmetric laminated glazing
Gérald Mercier, Compiegne (FR); Jean-Philippe Boure, Ribecourt (FR); Simon Defreitas, Paris (FR); and Thibault Rapenne, Noyon (FR)
Assigned to SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
Appl. No. 17/909,202
Filed by SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
PCT Filed Mar. 11, 2021, PCT No. PCT/EP2021/056129
§ 371(c)(1), (2) Date Sep. 2, 2022,
PCT Pub. No. WO2021/180828, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2002440 (FR), filed on Mar. 12, 2020.
Prior Publication US 2023/0093696 A1, Mar. 23, 2023
Int. Cl. B32B 17/10 (2006.01)
CPC B32B 17/10036 (2013.01) [B32B 17/10091 (2013.01); B32B 17/10119 (2013.01); B32B 17/10339 (2013.01); B32B 17/10761 (2013.01); B32B 2307/102 (2013.01); B32B 2307/402 (2013.01); B32B 2307/732 (2013.01); B32B 2605/006 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A formed laminated glazing for a vehicle, comprising two sheets of glass of different thicknesses that form a thick glass sheet and a thin glass sheet separated by an interlayer made of polymer material, wherein
a thickness E1 of the thick glass sheet is such that 1.4 mm≤E1≤3.9 mm,
a thickness E2 of the thin glass sheet is such that 1.1 mm≤E2≤2.6 mm,
a thickness E3 of the polymer material M is such that
0.3 mm≤E3≤1.2 mm,
a total glass thickness EV is such that 2.5 mm≤EV≤5.7 mm,
a ratio of the thicknesses E2/E1 is from 0.45 to 0.62, thereby providing a balance of rigidity and sound insulation characterized by:
(i) rigidity at least 104% of that of a symmetric laminated glazing of equal total glass thickness, and
(ii) a minimum sound transmission loss (STL) at least 94% of that of the symmetric laminated glazing, measured in a 2000-5000 Hz range.