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

摘要

The invention relates to a viscoelastic plastic interlayer intended to be incorporated between two sheets of glass to form a laminated glazing having vibro-acoustic damping properties, the interlayer comprising at least one layer (3) of viscoelastic plastic material with vibro-acoustic damping properties, the interlayer being such that the resonance frequency f2 of the second mode of resonance of a 25 mm x 300 mm laminated glazing rod composed of two sheets of glass of thickness 2, 1 mm each, between which the interlayer is incorporated, determined by a measurement of the mechanical impedance (MIM) at 20 ° C according to ISO 16940, is between 760 Hz and 1000 Hz and the loss factor? 2 of the second resonance mode of the same bar, determined by MIM under the same conditions, is greater than or equal to 0.25. The invention allows a reduction in the thickness of the glass sheets without degradation of the vibro-acoustic damping properties.