Multiple layer interlayer resisting defect formation
AssigneeSolutia Inc.
InventorJun Lu
Life of this patent
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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.
Claims20
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 polyvinyl 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;
- and
- 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 polymer interlayer has a damping loss factor (η) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15.
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 difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent;
- and
- 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 polymer interlayer has a damping loss factor (η) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15, and wherein the second poly(vinyl butyral) resin is present in an amount of from about 5 weight percent to about 45 weight percent.
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 difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent;
- and
- 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 soft layer of the polymer interlayer has at least two glass transition temperatures (Tg) and the difference between the two different glass transition temperatures (Tg) is at least 3° C.
Dependencies are inferred from the claim text.