Ppg Industries, Inc.

William I Frey

Joseph P Cherenko

William R Beestrice

Joseph D Kelly

Larry S Sokol

A transparent safety glass laminate having an optically acceptable exposed plastic surface is fabricated by laminating an outer glass sheet and an inner preformed plastic sheet under heat and pressure with the plastic surface to be exposed supported against an optically smooth mold, preferably a second glass sheet, which is coated with an optically smooth coating of a material which acts as a release agent to facilitate separation of the plastic surface from the mold after lamination.

Release molds for laminating bilayer safety glass

An improved release surface for a laminating mold is disclosed wherein a glass mold surface is treated with methylchlorosilane to provide a release surface which is then polished with a polar solvent such as alcohol to remove oily residue from the release surface of the mold so that the surface of the released article is free from haze.

Method for developing a release surface on a glass mold

Retarding bloom in normally blooming polyurethane interlayers which are used in laminated windows, particularly motor vehicle safety glass windows in which one major surface of the polyurethane is exposed to the atmosphere, by applying a layer of wax to the exposed major surface of the polyurethane interlayer is disclosed. The resulting window is free from bloom for at least several months.

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Curtisville, PA, United States of America

William I Frey