VISCOELASTIC PLASTIC INTERLAYER FOR VIBRO-ACOUSTIC DAMPING AND GLAZING COMPRISING SUCH AN INTERLAYER

• US 20170210097A1
• Filed: 11/25/2014
• Published: 07/27/2017
• Est. Priority Date: 11/27/2013
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: PAYEN, Corinne, FOURNIER, David
• Granted Patent: US 9,994,001 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10651 comprising colorants, e.g. dyes or pigments
• CPC Class Codes: B32B 17/1066 imparting a tint in certain regions only, i.e. shade band
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2307/102 Insulating
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B60J 1/001 Double glazing for vehicles
• CPC Class Codes: B60J 3/007 Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens layered glass products B32B17/00; process of coating windows C03C17/00
• CPC Class Codes: B60R 13/0815 Acoustic or thermal insulation of passenger compartments wall or roof liners integrating the insulating function B60R13/02; insulating floor mats or carpets B60N3/04
• CPC Class Codes: G10K 11/168 Plural layers of different materials, e.g. sandwiches

Abstract

A viscoelastic plastic interlayer to be incorporated between two glass sheets forms a laminated glazing with vibro-acoustic damping properties. The interlayer includes at least one layer made of viscoelastic plastic with vibro-acoustic damping properties. The interlayer is tinted in the bulk at least on a part of its surface. The interlayer is such that the resonant frequency f₂ of the second resonance mode of a laminated glazing bar with a surface area of 25 mm×300 mm composed of two glass sheets each 2.1 mm thick, between which is incorporated the interlayer, determined by measuring the mechanical impedance (MIM) at 20° C. according to standard ISO 16940, is between 760 Hz and 1000 Hz and the loss factor η₂ of the second resonance mode of the same bar, determined by MIM under the same conditions, is greater than or equal to 0.25.

Claims

1. A viscoelastic plastic interlayer to be incorporated between two glass sheets to form a laminated glazing with vibro-acoustic damping properties, the interlayer comprising:

at least one layer made of viscoelastic plastic with vibro-acoustic damping properties,

the interlayer being tinted in the bulk at least on a part of a surface of the interlayer,

the interlayer being such that a resonant frequency f₂ of a second resonance mode of a laminated glazing bar with a surface area of 25 mm×

300 mm composed of two glass sheets each 2.1 mm thick, between which is incorporated the interlayer, determined by measuring a mechanical impedance (MIM) at 20°

C. according to standard ISO 16940, is between 760 Hz and 1000 Hz and a loss factor η

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.

2. The interlayer according to claim 1, in which the layer includes polyvinyl butyral and plasticizer.

3. The interlayer according to claim 1, in which the resonant frequency f₂ is between 800 and 900 Hz.

4. The interlayer according to claim 1, in which the loss factor η

₂ is greater than 0.30.

5. The interlayer according to claim 1, further comprising:

two outer layers made of standard PVB, the layer being between the two outer layers.

6. The interlayer according to claim 1, in which the measurement of the mechanical impedance is performed at least one month after assembly of the laminated glazing bar, the laminated glazing bar having been assembled at least one month after manufacture of the interlayer.

7. A glazing, comprising:

a glass sheet between 0.5 mm and 2.6 mm thick,

a glass sheet between 0.5 mm and 1.6 mm thick,

the interlayer according to claim 1, the interlayer being between the glass sheets,

in which a total thickness of the glass sheets is strictly less than 3.7 mm.

8. The glazing according to claim 7, in which the interlayer is tinted only in an upper part.

9. The glazing according to claim 7, in which the interlayer is tinted over an entire surface.

10. A motor vehicle, comprising:

the glazing according to claim 7, the glass sheet between 0.5 mm and 2.6 mm thick being turned facing an exterior of the vehicle and the glass sheet between 0.5 mm and 1.6 mm thick being turned facing an interior of the vehicle.

11. The glazing according to claim 7, wherein the glazing is a motor vehicle windscreen.

12. The glazing according to claim 7, wherein the glazing is as a windscreen, a front side window, a rear side window, a rear window or a quarter glass of a motor vehicle.

13. The interlayer according to claim 1, in which the resonant frequency f₂ is between 800 and 850 Hz.