MULTIPLE LAYER INTERLAYER RESISTING DEFECT FORMATION

Abstract

Multilayered interlayers comprising stiff skin or outer layers and a soft core layer(s) are disclosed. The multilayered interlayers comprise: a first polymer layer (skin layer) comprising plasticized poly(vinyl butyral) resin; a second polymer layer (core layer) comprising a blend of two (or more) plasticized poly(vinyl butyral) resins having different residual hydroxyl content; and optionally a third polymer layer (skin layer) comprising plasticized poly(vinyl butyral) resin.

Claims

1. A polymer interlayer that resists formation of iceflower defect, the polymer interlayer comprising: at least one soft layer wherein the soft layer comprises a blend of two or more poly(vinyl butyral) resins comprising: a first poly(vinyl butyral) resin having a first residual hydroxyl content; a second poly(vinyl butyral) resin having a second residual hydroxyl content, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent; a plasticizer, wherein the first poly(vinyl butyral) resin, the second poly(vinyl butyral) resin, and the plasticizer are mixed and melt-extruded to form the at least one soft layer; at least one stiffer layer comprising a third poly(vinyl butyral) resin having a third residual hydroxyl content and a plasticizer, wherein the difference between the third residual hydroxyl content and at least one of the first and second residual hydroxyl contents is at least 2.0 weight percent; wherein the polymer interlayer has a damping loss factor (n) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15.

2. The polymer interlayer of claim 1, wherein the second poly(vinyl butyral) resin is present in an amount of from about 5 weight percent to about 45 weight percent.

3. The polymer interlayer of claim 1, wherein the second poly(vinyl butyral) resin is present in an amount of from about 10 weight percent to about 40 weight percent.

4. The polymer interlayer of claim 1, wherein the soft layer of the polymer interlayer has at least one glass transition temperature (T.sub.g) less than 15 C.

5. The polymer interlayer of claim 1, wherein the residual hydroxyl content of the third poly(vinyl butyral) resin is the same as the residual hydroxyl content of the first poly(vinyl butyral) resin or the second poly(vinyl butyral) resin.

6. The polymer interlayer of claim 1, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 4.0 weight percent.

7. The polymer interlayer of claim 1, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 6.0 weight percent.

8. The polymer interlayer of claim 1, wherein the polymer interlayer has at least two different glass transition temperatures (T.sub.g) and the difference between the at least two different glass transition temperatures (T.sub.g) is at least 3 C.

9. A polymer interlayer that resists formation of iceflower defect, the polymer interlayer comprising: at least one soft layer wherein the soft layer comprises a blend of two or more poly(vinyl butyral) resins comprising: a first poly(vinyl butyral) resin having a first residual hydroxyl content of from 7 to 14 weight percent; a second poly(vinyl butyral) resin having a second residual hydroxyl content of from 12 to 35 weight percent; wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent; a plasticizer, wherein the first poly(vinyl butyral) resin, the second poly(vinyl butyral) resin, and the plasticizer are mixed and melt-extruded to form the at least one soft layer; at least one stiffer layer comprising a third poly(vinyl butyral) resin having a third residual hydroxyl content of from 15 to 35 weight percent and a plasticizer, wherein the polymer interlayer has a damping loss factor () (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15.

10. The polymer interlayer of claim 9, wherein the soft layer of the polymer interlayer has at least one glass transition temperature (T.sub.g) less than 15 C.

11. The polymer interlayer of claim 9, wherein the residual hydroxyl content of the third poly(vinyl butyral resin) is the same as the residual hydroxyl content of the first poly(vinyl butyral resin) or the second poly(vinyl butyral resin).

12. The polymer interlayer of claim 9, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 4.0 weight percent.

13. The polymer interlayer of claim 9, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 6.0 weight percent.

14. The polymer interlayer of claim 9, wherein the polymer interlayer has at least two different glass transition temperatures (T.sub.g) and the difference between at least two different glass transition temperatures (T.sub.g) is at least 3 C.

15. A polymer interlayer that resists formation of iceflower defects, the polymer interlayer comprising: at least one soft layer wherein the soft layer comprises a blend of two or more poly(vinyl butyral) resins comprising: a first poly(vinyl butyral) resin having a first residual hydroxyl content; a second poly(vinyl butyral) resin having a second residual hydroxyl content, wherein the first poly(vinyl butyral) resin has a first glass transition temperature (T.sub.g) of the plasticized first resins, and the second poly(vinyl butyral) resin has a second glass transition temperature (T.sub.g) of the plasticized second resin, wherein at least one of the first and second glass transition temperature is less than 15 C., and wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent; at least one stiffer layer comprising a third poly(vinyl butyral) resin having a third residual hydroxyl content and a plasticizer, wherein the difference between the third residual hydroxyl content and at least one of the first and second residual hydroxyl contents is at least 2.0 weight percent; wherein the polymer interlayer has a damping loss factor () (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15.

16. The polymer interlayer of claim 15, wherein the second poly(vinyl butyral) resin is present in an amount of from about 5 weight percent to about 45 weight percent.

17. The polymer interlayer of claim 15, wherein the second poly(vinyl butyral) resin is present in an amount of from about 10 weight percent to about 40 weight percent.

18. The polymer interlayer of claim 15, wherein the polymer interlayer has at least two different glass transition temperatures (T.sub.g) and the difference between at least two different glass transition temperatures (T.sub.g) is at least 3 C.

19. The polymer interlayer of claim 15, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 4.0 weight percent.

20. The polymer interlayer of claim 15, wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 6.0 weight percent.

Description

EXAMPLES

[0075] Exemplary core layers of the present disclosure (designated as Disclosed Layers and as shown as DL 1-8 in Table 1 below) and comparative core layers (designated as Comparative Layers and as shown as CL 1-2 in Table 1 below) were produced by mixing and melt-extruding 100 parts poly(vinyl butyral) resins and various amounts of plasticizer, and other common additives (as described above), as shown in Table 1. The core layers depicted in Table 1 were then used to construct various multilayered interlayers as shown in Table 2 and Table 3 and as described more fully below.

[0076] The improvements (or reduction) in iceflower defect formation in a multilayer interlayer can be most readily appreciated by a comparison of multilayer (trilayer) interlayers having a blend of two resins of different residual hydroxyl content and at least one plasticizer in the core layer (designated as Disclosed Interlayers) to a multilayer interlayer having a core layer formed from only a single resin (of a fixed residual hydroxyl content) and at least one plasticizer in the core layer (designated as Comparative Interlayers). The Comparative Interlayers are shown as CI-1 to CI-4, and the Disclosed Interlayers are shown as DI-1 to DI-16 in Table 2 and Table 3. These Examples demonstrate that iceflower defects can be significantly reduced or completely eliminated when at least two PVB resins having differing residual hydroxyl contents are used in the core layer, such as when a second PVB resin having a higher residual hydroxyl content is added to (or combined with) a first PVB resin having a lower residual hydroxyl level the core layer.

[0077] The resins used in the Tables below are PVB resins having residual hydroxyl contents and vinyl acetate residues as follows:

[0078] Resin-A: about 10-11 wt. % residual hydroxyl content and a vinyl acetate residue of 2%.

[0079] Resin-B: about 16 wt. % residual hydroxyl content and a vinyl acetate residue of 2%.

[0080] Resin-C: about 18-19 wt. % residual hydroxyl content and a vinyl acetate residue of 2%.

[0081] Resin-D: about 21-22 wt. % residual hydroxyl content and a vinyl acetate residue of 2%.

[0082] The poly(vinyl butyral) resin used in the skin layer(s) in the Examples had about 18-19 wt. % residual hydroxyl content (Resin-C). For the core layers shown in Table 1, the first poly(vinyl butyral) resin used in the core layer had about 10-11 wt. % residual hydroxyl content (Resin-A), and the residual hydroxyl content of the second resin used in the core layer varied (Resin-B, Resin-C or Resin-D) as shown in Table 1. Core layers were produced according to the above procedure using a combination of first and second PVB resins having different residual hydroxyl contents and a plasticizer (either a conventional plasticizer (3GEH, RI=1.442 at 25 C.) or a high refractive index plasticizer (isodecyl benzoate, RI=1.490 at 25 C.)), as indicated in Table 1 below.

TABLE-US-00001 TABLE 1 Plasticizer Tg of Plasticizer (isodecyl Tg of plasticized Resin-A Resin-B Resin-C Resin-D (3GEH) benzoate) plasticized second Core (parts, (parts, (parts, (parts, Content in Content in Resin-A PVB Resin Layer wt) wt) wt) wt) PVB (phr) PVB (phr) ( C.) ( C.) CL-1 100 75 3 DL-1 95 5 73 3 30 DL-2 90 10 71 3 30 DL-3 80 20 68 3 30 DL-4 65 35 62 3 30 DL-5 85 15 75 3 17 DL-6 70 30 75 4 16 DL-7 55 45 75 5 15 CL-2 100 78 2 DL-8 95 5 78 2 37

[0083] As shown in Table 1, core layers DL-1 through DL-4 contain a first resin (Resin-A, having residual hydroxyl content of about 10-11 wt. %), a second resin (Resin-C, having a residual hydroxyl content of 18-19 wt. %) in amounts varying from 5 to 35 wt. %, and a plasticizer (3GEH) at levels of 62 to 73 phr. Core layer CL-1 is a control or comparative example having only a first resin (Resin-A) and 75 phr conventional plasticizer (3GEH). Core layers DL-5 to DL-7 contain a first resin (Resin-A, having residual hydroxyl content of about 10-11 wt. %), a second resin (Resin-B, having a residual hydroxyl content of about 16 wt. %) in amounts varying from 15 to 45 wt. %, and a plasticizer (3GEH) at a level of 75 phr. Core layer CL-2 has only a first resin (Resin-A) and 78 phr high refractive index plasticizer (isodecyl benzoate). Core layer DL-8 contains a first resin (Resin-A, having residual hydroxyl content of about 10-11 wt. %), a second resin (Resin-D, having a residual hydroxyl content of about 21-22 wt. %) and a high refractive index plasticizer (isodecyl benzoate) at a level of 78 phr.

[0084] As shown in Table 1, the plasticizer level is gradually reduced from 73 phr to 62 phr in core layers DL-1 to DL-4 to account for the plasticizer partitioning between the skin and the core layers as the amount of the second resin is increased. For core layers DL-5 to DL-7, the plasticizer level was held constant at 75 phr. The T.sub.g of the plasticized Resin-A was 3 C. for DL-1 to DL-4, -3 to 5 C. for DL-5 to DL-7, and for DL-8 it was 2 C.

[0085] The core layers of Table 1 were then used in multiple layer (trilayer) interlayers as shown in Table 2 below to produce control or comparative interlayers CI-1 to CI-4 and disclosed interlayers DI-1 to DI-16 according the present invention.

[0086] The disclosed interlayers DI-1 through D1-12 were all produced using core layers DL-1 to DL-4 (from Table 1), which comprise Resin-A (10-11 wt. % residual hydroxyl content) and a second resin, Resin-C (18-19 wt. % residual hydroxyl content), in varying amounts from 5 wt. % to 35 wt. % (as shown in Table 1). Resin-C was also used to produce the skin layers. The residual hydroxyl content of the second resin (Resin-C) was about 7 to 9 wt. % higher than that of the first resin (and the same as the skin layer resin).

[0087] In CI-1 to CI-3 and D1-1 to DI-12, the first resin in the core layer had a plasticizer content of 75 phr, and the second resin in the core layer had a plasticizer content of 38 phr (which is the same amount as in the skin layer of the samples). The core layer thickness ranged from 0.13 mm to 0.51 mm in samples CI-1 to CI-3 and DI-1 to DI-12.

[0088] Disclosed interlayers D1-13 though DI-15 were produced using core layers DL-5 to DL-7 (respectively, from Table 1) which comprise Resin-A (10-11 wt. % residual hydroxyl content) and a second resin, Resin-B (16 wt. % residual hydroxyl content), in varying amounts (as shown in Table 1). The residual hydroxyl content of the second resin was about 5 to 6 wt. % higher than that of the first resin and about 3 wt. % lower than that of the resin used in the skin layer (Resin-C). The core layer thickness was 0.13 mm (5 mils). Due to plasticizer partitioning between the first and the second resins in the core layer and between the resins in the core layer and the resin in the skin layers, a new equilibria in the plasticizer partitioning between these resins was reached. At equilibrium, the first resin in the core had about 77 to 81 phr plasticizer (which is higher than the 75 phr plasticizer level in the control sample, CI-3); the second resin in the core had about 50 phr plasticizer and the skin layer resin had about 38 to 39 phr plasticizer.

[0089] The disclosed interlayer DI-16 was produced using core layer DL-8 (from Table 1) which comprised Resin-A (10-11 wt. % residual hydroxyl content) and a second resin, Resin-D (21-22 wt. % residual hydroxyl content). Core layer DL-8 contained 5 wt. % of a Resin-D, which is 11 to 12 wt. % higher than the first resin (Resin-A) and 3 to 4 wt. % higher than the resin in the skin layer (Resin-C), and a high refractive index plasticizer. The plasticizer partitioning between the first resin (Resin-A) and the skin resin (Resin-C) in DI-16 is the same as in the comparative interlayer CI-4, which has 100% of Resin-A in the core layer. The plasticizer partitioning between the first and the second core layer resins and between the second resin and the skin layer resin are different from the comparative interlayer CI-4 because the second resin has a different residual hydroxyl content level.

TABLE-US-00002 TABLE 2 Final Final Skin Combined plasticizer plasticizer Tg of Tg of Layer Thickness Final content in content in plasticized plasticized Resin Skin Layer of Skin Core plasticizer core layer core layer first second % OH Plasticizer Layers Layer Core layer content in first second resin in resin in Interlayer content content 1 and 2 (from thickness skin layer Resin Resin core layer core layer No. (wt. %) (phr) (mm) Table 1) (mm) (phr) (phr) (phr) ( C.) ( C.) Cl-1 19 38 0.33 CL-1 0.51 38 75 3 Dl-1 19 38 0.33 DL-1 0.51 38 75 38 3 30 Dl-2 19 38 0.33 DL-2 0.51 38 75 38 3 30 Dl-3 19 38 0.33 DL-3 0.51 38 75 38 3 30 Dl-4 19 38 0.33 DL-4 0.51 38 75 38 3 30 Cl-2 19 38 0.58 CL-1 0.26 38 75 3 30 Dl-5 19 38 0.58 DL-1 0.26 38 75 38 3 30 Dl-6 19 38 0.58 DL-2 0.26 38 75 38 3 30 Dl-7 19 38 0.58 DL-3 0.26 38 75 38 3 30 Dl-8 19 38 0.58 DL-4 0.26 38 75 38 3 30 Cl-3 19 38 0.71 CL-1 0.13 38 75 3 Dl-9 19 38 0.71 DL-1 0.13 38 75 38 3 30 Dl-10 19 38 0.71 DL-2 0.13 38 75 38 3 30 Dl-11 19 38 0.71 DL-3 0.13 38 75 38 3 30 Dl-12 19 38 0.71 DL-4 0.13 38 75 38 3 30 Dl-13 19 38 0.71 DL-5 0.13 38 77 49 3 19 Dl-14 19 38 0.71 DL-6 0.13 39 80 49 3 19 Dl-15 19 38 0.71 DL-7 0.13 39 81 50 3 19 Cl-4 19 39 0.71 CL-2 0.13 39 78 2 Dl-16 19 39 0.71 DL-8 0.13 39 78 34 2 37

[0090] The exemplary multilayered interlayers DI-1 to DI-16 and the control or comparative multilayered interlayers CI-1 to CI-4 in Table 2 can be compared to show the improvement of the multilayered interlayers of the present invention in resisting iceflower defect formation when the multilayered interlayers are used in multilayer laminate glass panels. As noted above, the core layers depicted in Table 1 were used to construct various multilayered interlayers as shown in Table 2, with the resultant multilayered interlayer used to construct laminates as shown in Table 3. The multilayered interlayers all have a general construction of skin layer/core layer/skin layer. The total thickness of each of the interlayers used was 0.84 mm. The laminates in Table 3 were each made with two (2) pieces of 2.3 mm clear glass, the interlayer (as shown in Table 3) and a 0.13-mm PET film ring in the center, as described above, along with the interlayer from Table 2 as shown in Table 3. The laminates were then nip rolled for de-airing. The average surface roughness (Rz) for the random rough surface interlayers was approximately 36 microns. The laminates were then tested to determine the amount (measured as the % area) of iceflower defects, Damping Loss Factor () at 20 C., % T.sub.vis, % Haze and Sound Transmission Loss (STL, at the reference frequency of 3150 Hz, in dB). Results are shown in Table 3.

TABLE-US-00003 TABLE 3 Hydroxyl Core content STL at layer Core of the Type of Area of Damping Reference Interlayer (from layer second plasticizer iceflower loss frequency No. (from Table thickness resin in the defect factor at T.sub.vis Haze 3,150 Hz Table 2) 1) (mm) (wt. %) interlayer (%) 20 C. (%) (%) (dB) Cl-1 CL-1 0.51 3GEH 18 0.38 88 0.3 40 Dl-1 DL-1 0.51 19 3GEH 14 0.37 86 2.1 N.T. Dl-2 DL-2 0.51 19 3GEH 6 0.38 85 4.7 40 Dl-3 DL-3 0.51 19 3GEH 2 0.40 84 16 N.T. Dl-4 DL-4 0.51 19 3GEH 0 0.30 83 34 40 Cl-2 CL-1 0.26 3GEH 20 0.41 88 0.3 40 Dl-5 DL-1 0.26 19 3GEH 18 0.41 88 0.8 N.T. Dl-6 DL-2 0.26 19 3GEH 10 0.42 87 2.1 40 Dl-7 DL-3 0.26 19 3GEH 4 0.36 85 8.3 N.T. Dl-8 DL-4 0.26 19 3GEH 0 0.25 87 18 39 Cl-3 CL-1 0.13 3GEH 35 0.36 88 0.3 40 Dl-9 DL-1 0.13 19 3GEH 25 0.35 88 0.4 N.T. Dl-10 DL-2 0.13 19 3GEH 10 0.31 87 0.7 40 Dl-11 DL-3 0.13 19 3GEH 6 0.29 87 3 N.T. Dl-12 DL-4 0.13 19 3GEH 0 0.16 87 7.5 38 Dl-13 DL-5 0.13 16 3GEH 0.13 N.T. N.T. N.T. N.T. Dl-14 DL-6 0.13 16 3GEH 0.13 N.T. N.T. N.T. N.T. Dl-15 DL-7 0.13 16 3GEH 0.13 N.T. N.T. N.T. N.T. Cl-4 CL-2 0.13 Isodecyl 30 0.36 88 0.3 40 benzoate Dl-16 DL-8 0.13 21.0 Isodecyl 5 0.35 88 0.3 40 benzoate N.T. = not tested

[0091] Table 3 demonstrates that adding a second resin having higher residual hydroxyl content to a first resin (having a lower residual hydroxyl content) to produce the core layer in the multilayer interlayer results in a significant reduction or even elimination of iceflower defect formation regardless of the core layer thickness. As shown in the Tables, the reduction in iceflower defect formation correlates with the residual hydroxyl content of the second resin. For example, when the second resin has a residual hydroxyl content of 18-19 wt. % (Resin-C), the iceflower defect is eliminated when this resin is present at 35 wt. %. When the second resin has a residual hydroxyl content of 16 wt. %, the iceflower defect can be eliminated when the second resin is present at 45 wt. %. Stated differently, the iceflower defect can be eliminated but more of the second resin having the lower residual hydroxyl level is necessary than the amount of resin needed having the higher residual hydroxyl level.

[0092] The effectiveness of the second resin to reduce or eliminate iceflower defects is further shown by comparing the area of iceflower defects in laminates having the same core layer with different core layer thicknesses. For example, comparing DI-1, DI-5 and DI-9, which all have 5 wt. % of Resin-C, as the core layer thickness decreases, the area of iceflower defects increases. But as the amount of Resin-C increases, the level of iceflower defects is reduced. At 35 wt. % Resin-C, the iceflower defects are completely eliminated at all three core layer thicknesses.

[0093] All interlayers showed high acoustic damping performance (expressed as damping loss factor () at 29 C.) and sound insulation (expressed as STL at reference frequency of 3.150 Hz). As the core layer was modified and the core layer thickness was varied, the acoustic damping and sound insulation performance also varied. For example, at core thickness levels of 0.51 mm, the damping loss factor () and STL were fairly consistent (or essentially unchanged) at between 0.37 and 0.40 and 40 dB in cores having from 5 to 20 wt. % of Resin-C, while at core thickness levels of only 0.13 mm, the Loss Factor was between 0.29 and 0.35 and STL was between 38 to 40 dB in cores having from 5 to 20 wt. % of Resin-C. At levels of 35 wt. % of the second resin, Resin-C, the damping loss factor () decreased slightly at all thicknesses and STL was fairly consistent. As shown by the data in Table 3, the acoustic performance (damping loss factor ()) is strongly dependent on the core layer thickness, and increasing core layer thickness improves the acoustic performance (increases the damping loss factor ()).

[0094] By adjusting the core thickness, the level of the second PVB resin in the core, and the residual hydroxyl contents of the resins in the skin and core layers, it is possible to design and produce a multilayer interlayer having improved properties (such as reduced levels of iceflower defects) without affecting its acoustic performance or damping loss factor. For example, CI-3 and DI-11 (0.13 mm (5 mils) core layer) have 0 and 20 wt. % of the second resin, Resin-C, respectively, and damping loss factor () of 0.36 and 0.29. Increasing (doubling) the core layer thickness from 0.13 mm (5 mils) to 0.26 mm (10 mils) while keeping the level of the second resin, Resin-C, at 20 wt. %, increases the damping loss factor from 0.29 (DI-11) to 0.36 (DI-7). By increasing the core layer thickness the same acoustic performance (or damping loss factor ()) can be achieved for the same resin blend composition. Adding only 5 wt. % of a second, higher residual hydroxyl content PVB resin to the core layer provided a significant reduction in iceflower defect formation without adversely or negatively affecting acoustic damping performance. Therefore, it is possible that an interlayer can be modified by adding to the core layer a PVB resin having a higher residual hydroxyl level to significantly reduce or eliminate iceflower defects without adversely affecting its damping loss factor.

[0095] As the plasticizer content was reduced in core layers DL-1 to DL-4 (from 73 phr to 62 phr), the plasticizer content in the first resin remained at 75 phr and the plasticizer partitioned between the first PVB resin in the core layer and the resin in the skin layer (as shown in Table 2) to be the same as in the comparative interlayers CI-1, CI-2, and CI-3. The plasticizer content in the second resin was about 38 phr.

[0096] Core layers DL-5 to DL-7 contain a second resin (Resin-B having a residual hydroxyl content of 16 wt. %) at levels of 15, 30 and 45 wt. % respectively, and a plasticizer content of 75 phr. Because of the plasticizer partitioning between the first and second resins in the core, the plasticizer content in the first resin is more than 75 phr and the plasticizer content in the second resin is less than 75 phr. As core layers DL-5 to DL-7 are combined with skin layers (as shown in Table 2), there is a further plasticizer partitioning between the skin layers and the core layer, resulting in plasticizer contents in the skin layers and in the core layer that are different from the amounts originally added.

[0097] In conclusion, the multilayered interlayers with core layers described herein have numerous advantages over conventional multilayered interlayers previously utilized in the art. In general, in comparison to multilayered interlayers previously utilized in the art, the multilayered interlayers comprising core layers as described herein have an increased resistance to the formation of iceflower defects common in multiple layer panels without sacrificing other properties, such as acoustic performance or optical properties (such as % Haze and % T.sub.vis). Other advantages will be readily apparent to those skilled in the art.

[0098] While the invention has been disclosed in conjunction with a description of certain embodiments, including those that are currently believed to be the preferred embodiments, the detailed description is intended to be illustrative and should not be understood to limit the scope of the present disclosure. As would be understood by one of ordinary skill in the art, embodiments other than those described in detail herein are encompassed by the present invention. Modifications and variations of the described embodiments may be made without departing from the spirit and scope of the invention.

[0099] It will further be understood that any of the ranges, values, or characteristics given for any single component of the present disclosure can be used interchangeably with any ranges, values or characteristics given for any of the other components of the disclosure, where compatible, to form an embodiment having defined values for each of the components, as given herein throughout. For example, an interlayer can be formed comprising poly(vinyl butyral) having a residual hydroxyl content in any of the ranges given in addition to comprising a plasticizers in any of the ranges given to form many permutations that are within the scope of the present disclosure, but that would be cumbersome to list. Further, ranges provided for a genus or a category, such as phthalates or benzoates, can also be applied to species within the genus or members of the category, such as dioctyl terephthalate, unless otherwise noted.