VISCOELASTIC PLASTIC INTERLAYER FOR VIBROACOUSTIC DAMPING AND GLAZING UNIT COMPRISING SUCH AN INTERLAYER

摘要

The present invention is a viscoelastic plastic interlayer intended to be included between two glass sheets to form a laminated glazing having vibroacoustic damping properties, the interlayer being a viscoelastic plastic having vibroacoustic damping properties. A laminated glazing bar comprising at least one layer (3) consisting of two glass sheets of 2.1 mm thickness each comprising such an intermediate layer therebetween and having a surface area of 25 mm x 300 mm. The resonant frequency f ₂ of the second resonance mode of is 760 Hz to 1000 Hz when measured by mechanical impedance measurement (MIM) at 20 ° C. according to standard ISO 16940, and the second resonance mode of the same bar It relates to a viscoelastic plastic interlayer which is such that the loss factor η ₂ of is made to be 0.25 or more when measured by MIM under the same conditions. With the present invention, the thickness of the glass sheet can be reduced without deteriorating the vibration damping properties.