VISCOELASTIC INSERT FOR A VIBROACOUSTIC DAMPING AND GLASS PANEL INCLUDING SUCH AN INSERT
European Patent Office Patent
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Abstract
The invention relates to a viscoelastic plastic insert intended to be incorporated between two glass sheets in order to form a laminated glass panel having vibroacoustics damping properties, the insert including at least one layer (3) made of a viscoelastic plastic having viscoacoustic damping properties and the insert being tinted in the body at least over a portion of the surface thereof, the insert being such that the resonance frequency f2 of the second resonance mode of a laminated glass panel bar, said glass panel having a 25 mm x 300 mm surface area and consisting of two glass panels which each have a thickness of 2.1 mm and between which the insert is incorporated, determined by measuring the mechanical impedance (MIM) at 20 °C according to ISO standard 16940, is 760 Hz to 100 Hz; and the loss factor η2 of the second resonance mode of the same bar, determined by MIM under the same conditions, is no lower than 0.25. The invention makes it possible to decrease the thickness of the glass panels without damaging the vibroacoustic damping properties, all the while respecting the privacy of the persons inside a vehicle or protecting the driver of the vehicle against blinding by sunlight.
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