Patent ID: 7829192

Claim:
A glazing comprising at least two glass sheets and a viscoelastic plastic insert arranged between the glass sheets, said insert comprising at least two damping films, one of the damping films being made of a material A and the other damping film being made of another material B, so that material A has, over a temperature range t A , a loss factor tan δ greater than 0.6 and a shear modulus G′ less than 2×10 7 Pa, and material B has, over a temperature range t B , a loss factor tan δ greater than 0.6 and a shear modulus G′ less than 2×10 7 Pa, wherein the insert provides acoustic comfort to the glazing over at least two distinct temperature ranges t 1 and t 2 , the temperature range t 1 being included within the temperate range t A and the temperature range t 2 being included within the temperature range t B , and in that the film which has, at a frequency of 200 Hz and for one of the two temperature ranges t 1 or t 2 , the highest loss factor tan δ, has an equivalent shear modulus G′ eq , such that G eq ′ = G ′ ⁢ e tot e where G′ is the shear modulus of the material constituting the film, e is the thickness of the film and e tot the total thickness of the insert, which is less than the equivalent shear modulus or moduli of the other film or films for said temperature range t 1 or t 2 .