Acoustic laminated glazing, acoustic interlayer and method...

Details Acoustic laminated glazing, acoustic interlayer and method... Acoustic laminated glazing, acoustic interlayer and method...

2007-05-10

2010-11-09

Nakarani, D. S (Department: 1787)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C181S289000, C181S290000, C428S212000, C428S436000

Reexamination Certificate

active

07829192

ABSTRACT:
Laminated glazing (2) comprising a viscoelastic plastic insert (3) comprising at least two damping films (30, 31) each having a loss factor tan δ greater than 0.6 and a shear modulus G′ less than 2×107Pa over two temperature ranges tAet tBrespectively, characterized in that the film which has, at a frequency of 200 Hz, the highest loss factor tan δ over a given temperature range included within the temperature range tAor tB, has an equivalent shear modulus G′eqless than the equivalent shear modulus or moduli of the other film or films, withGeq′=G′⁢etotewhere G′ is the shear modulus of the material constituting the film, e is the thickness of the film and etotthe total thickness of the insert.

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