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) a non-cellulose ester layer comprising a poly(vinyl acetal) resin and a plasticizer,
- wherein the non-cellulose ester layer has a glass transition temperature (“Tg”) of less than 30° C.;
- and
- (b) a 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 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.
A multilayer interlayer comprising:
- (a) a non-cellulose ester layer comprising:
- (i) a first layer comprising a first poly(vinyl acetal) resin and a plasticizer,
- wherein the first poly(vinyl acetal) layer has a glass transition temperature (“Tg”) of less than 20° C., and
- (ii) a second layer comprising a second poly(vinyl acetal) resin and a plasticizer,
- wherein the second poly(vinyl acetal) layer has a Tg of greater than 20° C.;
- (b) a 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, and a plasticizer,
- wherein said cellulose ester layer has a Tg of at least 50° C. and nor more than 250° C.;
- wherein an adhesive coating is interposed between the cellulose ester layer and the non-cellulose ester layer.
A multilayer interlayer comprising:
- (a) a first non-cellulose ester layer comprising a poly(vinyl acetal) resin and a plasticizer,
- wherein the first non-cellulose ester layer has a glass transition temperature (“Tg”) of less than 30° C.;
- (b) a 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 Tg of at least 50° C. and not more than 250° C.;
- and
- (c) a second non-cellulose ester layer comprising a poly(vinyl acetal) resin and a plasticizer,
- wherein the second non-cellulose ester layer has a Tg of greater than 30° C.,
- wherein said first non-cellulose ester layer is between and in contact with said cellulose ester layer and said second non-cellulose ester layer;
- and
- wherein an adhesive coating is interposed between a cellulose ester layer and a non-cellulose ester layer.
Dependencies are inferred from the claim text.