Transparent light-weight safety glazings

Abstract

Provided is a transparent and light-weight ballistic resistant safety glazing comprising an ionomer sheet. The ionomer sheet comprises an ionomer derived from a parent acid copolymer that comprises copolymerized units of an α-olefin having 2 to 10 carbon atoms and, based on the total weight of the acid copolymer, about 20 to about 30 wt % of copolymerized units of an α,β-ethylenically unsaturated carboxylic acid having 3 to 8 carbon atoms. The ionomer is neutralized to a level of about 5% to about 90%, based on the total carboxylic acid content of the acid copolymer, and further comprises at least one cation. Further provided are articles comprising the light-weight ballistic resistant safety glazing.

Description

FIELD OF THE INVENTION[0001]The invention relates to the field of impact and penetration resistant glazing. In particular, provided herein is transparent and light-weight safety glazing that has resistance to ballistic impacts and that comprises ionomer sheets.BACKGROUND OF THE INVENTION[0002]Several patents, patent applications and publications are cited in this description in order to more fully describe the state of the art to which this invention pertains. The entire disclosure of each of these patents, patent applications and publications is incorporated by reference herein.[0003]Laminated safety glazing has been in use for almost a century. It has been used in a variety of industries, such as the architecture and transportation industries. For example, laminated safety glazing that possesses high impact and penetration resistance and that does not scatter glass shards or debris when it is shattered can be used as windows in buildings and as windshields or moon roofs in automob...

AI Technical Summary

Benefits of technology

[0012]Provided herein is a ballistic resistant safety glazing comprising an impact zone and, adhered firmly to the impact zone, an anti-spall zone. A preferred 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. The impact zone comprises n glass sheets and at least (n −1) ionomer sheets, where n is an integer and 2≦n≦10. Each adjacent pair of glass sheets is interspaced by at least ionomer sheet, and the glass sheets and the ionomer sheets are adhered firmly to each other. Each of the ionomer sheets comprises an ionomer composition that comprises an ionomer. The ionomer is derived from a parent acid copolymer that comprises copolymerized units of an α-olefin having from 2 to 10 carbon atoms and, based on the total weight of the parent acid copolymer, from about 20 to about 30 wt % of copolymerized units of an α,β-ethylenically unsaturated carboxylic acid having 3 to 8 carbon atoms. The ionomer is neutralized to a level of about 5 mole % to about 90 mole % of carboxylate groups, based on the total number of moles of copolymerized units of α,β-ethylenically unsaturated carboxylic acid in the parent acid copolymer. The ionomer further comprises cations as counterions to the carboxylate groups. The ionomers and the ionomer compositions of the ionomer sheets may be the same or different.

[0013]Further provided is an article comprising this safety glazing.

[0014]The advantages and features of novelty that characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. For a better understanding of the invention, its advantages, and the objects obtained by its use, however, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described one or more preferred embodiments of the invention.

Problems solved by technology

These effects are plainly undesirable.

Images