C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
154/45
C03C 27/12 (2006.01) B32B 17/10 (2006.01)
Patent
CA 1155743
Abstract This invention relates to the lamination of large glass sheets using plasticized interlayer material without the use of autoclaves. Excess liquid plasticizer is applied to the major surfaces of a sheet of plasticized interlayer material to soak the major surfaces at room tempera- ture for sufficient soaking time to soften the surfaces so that the inter- layer becomes more amenable to adhesion to glass sheets, but insufficient time to normalize the plasticizer content throughout the thickness of the plasticized sheet. The interlayer sheet is assembled between a pair of glass sheets and the excess plasticizer is removed by compressing the assembly before the soaking time is excessive and the plasticizer concen- tration can normalize throughout the thickness of the plasticized interlayer sheet. With the excess liquid plasticizer at the interfacial surfaces only, the assembly is subjected to a temperature range above room tempera- ture and below the temperature at which the plasticizer developes a vola- tile product and a superatmospheric pressure not more than two atmosspheres. This removes excess plasticizer from the interfacial surfaces so as to limit the increase in normalized plasticizer content and also permits the sheets to be laminated to one another. The lamination process is characterized by absence of plasticizer on the surfaces of the glass sheets that form the outermost surfaces of the laminate, and develops laminated assemblies that are free of bubbles, are not likely to delaminate during use and have interlayers that provide the laminated assemblies with good penetration resistance on impact.
402784
Gowling Lafleur Henderson Llp
Ppg Industries Ohio Inc.
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