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US 9,809,009 B2Granted
Multiple layer interlayer having improved optical and sound insulation properties
AssigneeSolutia Inc.
InventorsJun Lu, Wenjie Chen, Curtis Schilling, III, John D'Errico, Weihong Cui, Zhou Li, Jeffrey B. Hurlbut
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Abstract
Multilayered interlayers having good acoustic properties comprising a stiff skin layer(s) and a soft core layer(s) are disclosed. The multilayered interlayers comprise: a first polymer layer (skin layer) comprising plasticized poly(vinyl acetal) resin; a second polymer layer (core layer) comprising plasticized poly(vinyl acetal) resin; wherein at least one plasticizer is a high refractive index plasticizer. The multilayered interlayers have low mottle and resist mottle formation.
Claims20
A polymer interlayer comprising:
- at least one soft layer having a first refractive index, the soft layer comprising a first poly(vinyl acetal) resin having a first residual hydroxyl content and a first residual acetate content, and a first plasticizer;
- at least one stiffer layer having a second refractive index, the stiffer layer comprising a second poly(vinyl acetal) resin having a second residual hydroxyl content and a second residual acetate content, and a second plasticizer;
- wherein at least one of the first and second plasticizers is a high refractive index plasticizer having a refractive index of at least about 1.460;
- wherein the absolute value of the difference between the first refractive index and the second refractive index (delta RI) is less than about 0.010;
- wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent;
- and
- wherein the polymer interlayer has a damping loss factor (η) (as measured by ISO 16940) of at least about 0.15 at 20° C. and a sound transmission loss (STL) (as measured by ASTM E90 (2009) at 20° C.) of at least 37 decibels.
4 more elements
A polymer interlayer comprising:
- at least one soft layer having a first refractive index, the soft layer comprising a first poly(vinyl acetal) resin having a first residual hydroxyl content and a first residual acetate content, and a first plasticizer;
- at least one stiffer layer having a second refractive index, the stiffer layer comprising a second poly(vinyl acetal) resin having a second residual hydroxyl content and a second residual acetate content, and a second plasticizer;
- wherein at least one of the first and second plasticizers is a high refractive index plasticizer having a refractive index of at least about 1.460;
- wherein the absolute value of the difference between the first refractive index and the second refractive index (delta RI) is less than about 0.010;
- wherein the difference between the first residual acetate content and the second residual acetate content is at least 2.0 weight percent;
- and
- wherein the polymer interlayer has a damping loss factor (η) (as measured by ISO 16940) of at least about 0.15 at 20° C. and a sound transmission loss (STL) (as measured by ASTM E90 (2009) at 20° C.) of at least 37 decibels.
4 more elements
A polymer interlayer comprising:
- at least one soft layer having a first refractive index, the soft layer comprising a first poly(vinyl acetal) resin having a first residual hydroxyl content and a first residual acetate content, and a first plasticizer;
- at least one stiffer layer having a second refractive index, the stiffer layer comprising a second poly(vinyl acetal) resin having a second residual hydroxyl content and a second residual acetate content, and a second plasticizer;
- wherein at least one of the first and second plasticizers is a high refractive index plasticizer having a refractive index of at least about 1.460;
- wherein the absolute value of the difference between the first refractive index and the second refractive index (delta RI) is less than about 0.010;
- wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent;
- wherein the difference between the first residual acetate content and the second residual acetate content is at least 2.0 weight percent;
- and
- wherein the polymer interlayer has a damping loss factor (η) (as measured by ISO 16940) of at least about 0.15 at 20° C. and a sound transmission loss (STL) (as measured by ASTM E90 (2009) at 20° C.) of at least 37 decibels.
5 more elements
Dependencies are inferred from the claim text.