wedge-shaped multilayer interlayer with an outer skin layer of varying thickness

Abstract

The present invention provides a multilayer interlayer having enhanced optical and acoustic properties, as well as a method for manufacturing and using the multilayer interlayer. [Solution] The interlayer 10 described herein may include at least two outer skin layers 1, 2 and an inner core layer 3, wherein one of the outer skin layers has a different thickness from the other at one or more locations along the interlayer. The multilayer interlayer can also exhibit acoustic properties and may optionally have an overall wedge-shaped thickness profile. Furthermore, in some embodiments, the interlayer and laminate formed therefrom can also reduce the transmission of infrared energy without sacrificing acoustic and / or optical performance.

Claims

1. A first polymer layer having a wedge shape, A second polymer layer having a wedge shape, and A third polymer layer between the first polymer layer and the second polymer layer. Includes, The first and second polymer layers each have a Tg that is at least 10°C higher than the glass transition temperature (Tg) of the third polymer layer. A wedge-shaped multilayer interlayer, A wedge-shaped multilayer interfilm in which the first polymer layer has a thickness of less than 0.30 mm at one or more positions of the interfilm.

2. The wedge-shaped multilayer interlayer according to claim 1, wherein the second polymer layer has a thickness of more than 0.30 mm at one or more locations of the interlayer.

3. The wedge-shaped multilayer interfilm according to claim 1, wherein the wedge-shaped multilayer interfilm has a thinnest edge portion and a thickest edge portion, and the maximum thickness of at least one of the first and second polymer layers does not exceed 0.3 mm within 40 centimeters from the thinnest edge portion.

4. The wedge-shaped multilayer interfilm according to claim 1, wherein the ratio of the thickness of the first polymer layer to the thickness of the thinnest edge of the tapered region is at least 0.20:1 and / or 0.85 or less:1, and the ratio of the thickness of the second polymer layer to the thickness of the thinnest edge of the tapered region is at least 0.1:1 and / or 0.45 or less:

1.

5. The wedge-shaped multilayer interlayer is a three-layer interlayer, the first, second, and third polymer layers are each formed from a plasticized polyvinyl acetal resin, the third polymer layer has a plasticizer content that is at least 5 phr (parts per 100 parts of resin) and / or 75 phr or less different from the plasticizer content of the first and / or second polymer layer, the third polymer layer has a glass transition temperature (Tg) that is at least 2°C and / or 50°C or less different from the glass transition temperature (Tg) of the first and / or second polymer layer, and the plasticized polyvinyl acetal resin contains polyvinyl butyral, and the first and the The wedge-shaped multilayer interfilm according to claim 1, wherein the polyvinyl butyral in the second polymer layer has a residual acetate content of less than 15 weight percent, the maximum difference in the residual hydroxyl content of the polyvinyl butyral in the first or second and third polymer layers is at least 3 percent, at least a portion of the surface of the wedge-shaped multilayer interfilm has a surface roughness (Rz) of 5 to 75 micrometers (microns), the wedge-shaped multilayer interfilm has an overall wedge angle of at least 0.05 milliradians and 1 milliradian or less, and the wedge-shaped multilayer interfilm has a spot value of 3.5 or less.

6. It comprises first, second, and third polymer layers, The third polymer layer is located between the first polymer layer and the second polymer layer. The first and second polymer layers each have a Tg that is at least 10°C higher than the glass transition temperature (Tg) of the third polymer layer. A wedge-shaped multilayer interlayer, The first polymer layer has a thickness profile defined by the following formula: [0.0014(D ｅ )+0.06]<T １ <[1.975141-(1.6936517) / (1+(D ｅ / 155.2664)^3.324064)] [In the formula, D ｅ This is the distance in centimeters from the thinnest edge of the wedge-shaped multilayer interlayer, T １ D is measured in millimeters. ｅ The thickness of the first polymer layer in D ｅ It is less than 100 cm. It has, A wedge-shaped multilayer interlayer, wherein at one or more locations of the interlayer, the first polymer layer has a thickness of less than 0.30 mm, and at one or more locations of the interlayer, the second polymer layer has a thickness of more than 0.30 mm.

7. The wedge-shaped multilayer interlayer according to claim 6, wherein the total distance between the thinnest edge and the thickest edge is at least 50 cm.

8. It comprises first, second, and third polymer layers, The third polymer layer is located between the first polymer layer and the second polymer layer, and at least one of the first and second polymer layers is wedge-shaped. The first and second polymer layers each have a Tg that is at least 10°C higher than the glass transition temperature (Tg) of the third polymer layer. A wedge-shaped multilayer interlayer, The wedge-shaped multilayer interfilm has a tapered region having a thinnest edge and a thickest edge, All points along the vertical center line extending between the thinnest and thickest edges have the following relationship: 1.25Tca>TcL>0.75Tca [In the formula, TcL is the local combined thickness of the first and second polymer layers, and Tca is the average combined thickness of the first and second polymer layers, calculated as follows: Tca=(Tc1+Tc2) / 2 In the formula, Tc1 is the combined thickness of the first and second polymer layers at the thinnest edge, and Tc2 is the combined thickness of the first and second polymer layers at the thickest edge. A wedge-shaped multilayer interlayer that satisfies the following conditions.

9. The wedge-shaped multilayer interfilm according to claim 8, wherein at one or more locations of the interfilm, the first polymer layer has a thickness of less than 0.30 mm, and at one or more locations of the interfilm, the second polymer layer has a thickness of more than 0.30 mm.

10. The wedge-shaped multilayer interfilm according to claim 8, wherein at least one of the first, second, and third polymer layers contains an IR absorbent.

11. The wedge-shaped multilayer interfilm according to claim 10, wherein the IR absorbent contains metal oxide particles.

12. The wedge-shaped multilayer interfilm according to claim 10, wherein the IR absorbent comprises particles having an average particle size of 100 nm or less.

13. It comprises first, second, and third polymer layers, The third polymer layer is located between the first polymer layer and the second polymer layer, and at least one of the first and second polymer layers is wedge-shaped. The first and second polymer layers each have a Tg that is at least 10°C higher than the glass transition temperature (Tg) of the third polymer layer. A wedge-shaped multilayer interlayer, The wedge-shaped multilayer interfilm has a thinnest edge portion, a thickest edge portion, and a tapered region having an overall wedge angle of at least 0.30 mrad. The total solar transmittance (%Tts) measured at the thickest edge of the tapered region is within 3% of the total solar transmittance measured at the thinnest edge of the tapered region. At least one of the first, second, and third polymer layers contains an IR absorbent, and each of the layers containing the IR absorbent is formed from the same polymer material at both the thinnest and thickest edges of the tapered region. A wedge-shaped multilayer interlayer, wherein at one or more locations of the interlayer, the first polymer layer has a thickness of less than 0.30 mm, and at one or more locations of the interlayer, the second polymer layer has a thickness of more than 0.30 mm.

14. The wedge-shaped multilayer interlayer according to claim 13, wherein the first polymer layer is wedge-shaped and has a thick end and a thin end, the thick end of the first polymer layer is at the thinnest edge of the tapered region, and the thin end of the first polymer layer is at the thickest edge of the tapered region.

15. A glazing formed from at least one rigid substrate and a wedge-shaped multilayer interlayer according to any one of claims 1 to 14.

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