Cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsAristotelis Karagiannis, Bruce Edward Wade, Weihong Cui, Michael Eugene Donelson, Khanh Duc Tran
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Abstract
An interlayer structure having a cellulose ester layer for use in structural laminates is described herein. The cellulose ester layer provides rigidity and support to multilayer interlayers comprising an array of different layers. Due to the diverse properties of the cellulose ester layers, the present interlayers can be useful in producing structural laminates having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.
Claims20
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a poly(vinyl acetal) resin;
- (b) a cellulose ester layer comprising at least one cellulose ester having a hydroxyl content of at least 0.5 weight percent based on the entire weight of the cellulose ester, wherein said cellulose ester layer has a glass transition (“Tg”) temperature of at least 50° C. and not more than 250° C.;
- wherein said cellulose ester interlayer exhibits a yellowness index of less than 1.5 and
- (c) an adhesive coating comprising at least one silicone-containing compound, wherein said adhesive coating is at least partially interposed between said non-cellulose ester layer and said cellulose ester layer.
A multilayer interlayer comprising:
- (a) a first non-cellulose ester layer comprising a poly(vinyl acetal) resin;
- (b) a cellulose ester layer comprising at least one cellulose ester having a hydroxyl content of at least 0.5 weight percent based on the entire weight of the cellulose ester, wherein said cellulose ester layer has a glass transition (“Tg”) temperature of at least 50° C. and not more than 250° C.;
- wherein said cellulose ester interlayer exhibits a Yellowness index of less than 1.5
- (c) a first adhesive coating comprising at least one silicone-containing compound, wherein said first adhesive coating is at least partially interposed between said first non-cellulose ester layer and said cellulose ester layer;
- (d) a second non-cellulose ester layer comprising a poly(vinyl acetal) resin;
- and
- (e) a second adhesive coating comprising at least one silicone-containing compound, wherein said second adhesive coating is at least partially interposed between said second non-cellulose ester layer and said cellulose ester layer.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a poly(vinyl acetal) resin and a plasticizer;
- (b) a cellulose ester layer comprising at least one cellulose ester having a hydroxyl content of at least 0.5 weight percent based on the entire weight of the cellulose ester and a plasticizer, wherein said cellulose ester layer has a glass transition (“Tg”) temperature of at least 70° C. and not more than 250° C.;
- wherein said cellulose ester interlayer exhibits a yellowness index of less than 1.5 and
- (c) an adhesive coating comprising at least one silicone-containing compound, wherein said adhesive coating is at least partially interposed between said non-cellulose ester layer and said cellulose ester layer.
Dependencies are inferred from the claim text.