Cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsBruce Edward Wade, Aristotelis Karagiannis, 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 or an ionomer resin;
- (b) a tie layer comprising a thermoplastic polymer resin selected from polyurethane resin or ethylene vinyl acetate resin;
- and
- (c) 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 has a glass transition (“Tg”) temperature of at least 50° C.,
- wherein said tie layer is disposed between and in contact with the non-cellulose ester layer and said cellulose ester layer;
- wherein said cellulose ester interlayer exhibits a yellowness index of less than 1.5 and wherein said interlayer exhibits a compressive shear adhesion (“CSA”) between the cellulose ester layer and the tie layer of at least 5.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a poly(vinyl acetal) resin;
- (b) a tie layer comprising a thermoplastic polymer resin selected from polyurethane resin or ethylene vinyl acetate resin;
- and
- (c) 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 has a glass transition (“Tg”) temperature of at least 70° C.,
- wherein said tie layer is disposed between and in contact with the non-cellulose ester layer and said cellulose ester layer;
- wherein said cellulose ester interlayer exhibits a yellowness index of less than 1.5 and wherein said interlayer exhibits a compressive shear adhesion (“CSA”) between the cellulose ester layer and the tie layer of at least 5.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a poly(vinyl acetal) resin;
- (b) a tie layer comprising a thermoplastic polymer resin selected from polyurethane resin or ethylene vinyl acetate resin;
- and
- (c) 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 has a glass transition (“Tg”) temperature of at least 70° C.,
- wherein said tie layer is disposed between and in contact with the non-cellulose ester layer and said cellulose ester layer;
- wherein said cellulose ester interlayer exhibits a yellowness index of less than 1.5 and wherein said interlayer exhibits a compressive shear adhesion (“CSA”) between the cellulose ester layer and the tie layer of at least 5.
Dependencies are inferred from the claim text.