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 comprising a thermoplastic polyurethane resin;
- and
- (b) at least one cellulose ester layer comprising at least one cellulose ester having a hydroxyl content of at least 0.5 weight percent and not more than 30 weight percent based on the entire weight of the cellulose ester,
- wherein said cellulose ester layer has a glass transition temperature (“Tg”) of at least 50° C. and not more than 250° C.;
- wherein an adhesive coating is interposed between the cellulose ester layer and the non-cellulose ester layer;
- and
- wherein said interlayer exhibits a yellowness index of less than 1.5.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a thermoplastic polyurethane resin;
- and
- (b) at least one cellulose ester layer comprising at least one cellulose ester and at least 5 parts per hundred resin (phr) of plasticizer,
- wherein said cellulose ester layer has a glass transition temperature (“Tg”) of at least 50° C. and not more than 250° C.;
- wherein an adhesive coating is interposed between the cellulose ester layer and the non-cellulose ester layer;
- and
- wherein said interlayer exhibits a yellowness index of less than 1.5.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising a thermoplastic polyurethane resin comprising an aliphatic isocyanate;
- and
- (b) at least one cellulose ester layer comprising acyl groups selected from acetate, propionate and butyrate groups and combinations thereof,
- wherein said cellulose ester layer has a glass transition temperature (“Tg”) of at least 70° C. and not more than 250° C.;
- wherein an adhesive coating is interposed between the cellulose ester layer and the non-cellulose ester layer;
- and
- wherein said interlayer exhibits a yellowness index of less than 1.5.
Dependencies are inferred from the claim text.