High impact polymer interlayers
AssigneeSolutia Inc.
InventorsWENJIE CHEN, ARISTOTELIS KARAGIANNIS
Life of this patent
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Abstract
Multiple poly(vinyl butyral) layer interlayers that can be used in multiple layer glass panel type applications that require a high level of impact protection, for example in hurricane protection applications or in bullet proof glass applications. This effect is achieved by forming a poly(vinyl butyral) interlayer that has a relatively stiff poly(vinyl butyral) inner layer disposed between two relatively soft outer poly(vinyl butyral) layers, where the stiffness difference is achieved by a plasticizer differential that is achieved at least in substantial part by a residual hydroxyl content difference among the poly(vinyl butyral) layers.
Claims20
An interlayer comprising:
- a first polymer layer comprising a first poly(vinyl butyral) resin and at least one plasticizer, wherein the residual hydroxyl content of said first poly(vinyl butyral) resin is at least about 18.5 weight percent, wherein the plasticizer content of said first polymer layer is about 27 parts per hundred resin (phr) or less;
- and
- a second polymer layer adjacent to and in contact with said first polymer layer, wherein said second polymer layer comprises a second poly(vinyl butyral) resin and at least one plasticizer,
- wherein the residual hydroxyl content of said first poly(vinyl butyral) resin is at least 5 weight percent greater than the residual hydroxyl content of said second poly(vinyl butyral) resin, and wherein the plasticizer content of said second polymer layer is at least 2 phr greater than the plasticizer content of said first polymer layer.
An interlayer comprising:
- a first outer polymer layer comprising a first poly(vinyl butyral) resin and at least one plasticizer;
- a second inner polymer layer comprising a second poly(vinyl butyral) resin and at least one plasticizer;
- and
- a third outer polymer layer comprising a third poly(vinyl butyral) resin and at least one plasticizer,
- wherein said second inner polymer layer is adjacent to and in contact with each of said first and said third outer polymer layers,
- wherein the residual hydroxyl content of said second poly(vinyl butyral) resin is at least 5 weight percent greater than the residual hydroxyl content of at least one of said first and said third poly(vinyl butyral) resins, wherein the plasticizer content of said second inner polymer layer is about 27 phr or less and wherein the plasticizer content of each of said first and said third outer polymer layers is at least 2 phr greater than the plasticizer content of said second inner polymer layer.
An interlayer comprising:
- a first polymer layer comprising a first thermoplastic polymer selected from the group consisting of polyurethane, polyvinyl chloride, poly(ethylene vinyl acetate), and combinations thereof;
- and
- a second polymer layer adjacent to and in contact with said first polymer layer, wherein said second polymer layer comprises a poly(vinyl butyral) resin and at least one plasticizer, wherein the residual hydroxyl content of said poly(vinyl butyral) resin is at least 20 weight percent and the plasticizer content of said second polymer layer is 27 phr or less.
Dependencies are inferred from the claim text.