Patent ID: 7919175
Filing Date: 2011-04-05
Classification: B32B,F41H,Y10T

Abstract:
1. A safety glazing comprising an impact zone; and, adhered firmly to the impact zone, an anti-spall zone; wherein the anti-spall zone comprises a polymer sheet having a first surface that is adhered firmly to the impact zone and a second surface that is adhered firmly to a polymer film, said polymer sheet comprising a poly(vinyl butyral) composition; and wherein the impact zone comprises n glass sheets and at least (n−1) ionomer sheets, wherein n is an integer and 3≦n≦10, wherein each adjacent pair of glass sheets is interspaced by at least one ionomer sheet, and wherein the glass sheets and the at least one ionomer sheet are adhered firmly by lamination; wherein the ionomer composition in each of the ionomer sheets may be the same or different; and further wherein each ionomer sheet has a thickness; the ionomer sheet that is closest to the anti-spall zone has a thickness of about 2 to about 20 mm; the ionomer sheet that is furthest from the anti-spall zone has a thickness of about 1 to about 10 mm; the ionomer sheet that is closest to the anti-spall zone has the greatest thickness; and the ionomer sheet that is furthest from the anti-spall zone has the smallest thickness.