US 12,134,248 B2
Laminated glass having areas with different refractive indices
Ion Lazar, Troisdorf (DE); Robin Eschrich, Troisdorf (DE); and Leonard Volpi, Troisdorf (DE)
Assigned to Kuraray Europe GmbH, Hattersheim (DE)
Appl. No. 17/433,160
Filed by KURARAY EUROPE GMBH, Hattersheim (DE)
PCT Filed Feb. 21, 2020, PCT No. PCT/EP2020/054679
§ 371(c)(1), (2) Date Aug. 23, 2021,
PCT Pub. No. WO2020/173838, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 19159848 (EP), filed on Feb. 27, 2019.
Prior Publication US 2022/0152985 A1, May 19, 2022
Int. Cl. B32B 3/26 (2006.01); B32B 17/10 (2006.01)
CPC B32B 17/10036 (2013.01) [B32B 17/1055 (2013.01); B32B 2315/08 (2013.01); B32B 2329/06 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A laminated glass, comprising two sheets of glass, adhered by an adhesive film comprising at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB; and at least one film A containing a polyvinyl acetal PA and optionally at least one plasticiser WA, wherein the refractive indices of film A and film B differ by at least 0.0002, wherein the thickness of film A is from 5 μm to 20 μm, and wherein film A prior to lamination has a thickness ratio to film B of less than 0.2, wherein the laminated glass has two surface areas and at least three edge areas and when the laminated glass is illuminated from one of the edge areas or surface areas, an indicia of genuineness from layer A is visible.