Cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsAristotelis Karagiannis, Bruce Edward Wade, 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) cellulose ester layer, wherein said cellulose ester has been treated with a boron containing compound;
- and
- (b) a non-cellulose ester layer comprising a thermoplastic polymer resin comprising poly(vinyl acetal) resin, ethylene vinyl acetate resin, thermoplastic polyurethane resin or ionomer resin,
- wherein an adhesive coating is at least partially interposed and/or positioned between the non-cellulose ester layer and the cellulose ester layer;
- wherein said cellulose ester layer has 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.
A multilayer interlayer comprising:
- (a) a cellulose ester layer having 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, wherein said cellulose ester has been treated with a boron containing compound;
- and
- (b) a non-cellulose ester layer comprising a thermoplastic polymer resin comprising poly(vinyl acetal) resin, ethylene vinyl acetate resin, thermoplastic polyurethane resin or ionomer resin.
A multilayer interlayer comprising:
- a cellulose ester layer having 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, wherein said cellulose ester has been treated with a boron containing compound, and wherein the cellulose ester comprises at least two different acyl groups selected from acetate, propionate, butyrate, other acyl groups and combinations thereof;
- and
- a non-cellulose ester layer comprising a thermoplastic polymer resin comprising poly(vinyl acetal) resin, ethylene vinyl acetate resin, thermoplastic polyurethane resin or ionomer resin,
- wherein an adhesive coating is at least partially interposed and/or positioned between the non-cellulose ester layer and the cellulose ester layer.
Dependencies are inferred from the claim text.