Patent ID: 8900691

Claim:
A viscoelastic plastic interlayer intended to be incorporated between two glass sheets of a glazing unit, the interlayer providing vibroacoustic damping properties to the glazing unit, the interlayer comprising: two outer layers made of a viscoelastic plastic material, a shear modulus G′ of the outer layers being greater than or equal to 3×10 7 Pa at 20° C. and for a frequency range between 100 Hz and 240 Hz; a central layer having a thickness h and having vibroacoustic damping properties such that h is less than or equal to 0.3 mm and such that a shear parameter g of the central layer is between 8×10 8 Pa/m and 2.67×10 9 Pa/m at 20° C. and for a frequency range between 100 Hz and 240 Hz, where g=G′/h, wherein the central layer is disposed between the two outer layers.