Cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsBruce Edward Wade, Aristotelis Karagiannis, Michael Eugene Donelson, Khanh Duc Tran
Life of this patent
Estimating the term…
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 polymer layer comprising a polymer blend,
- wherein said polymer blend comprises:
- (i) at least one non-cellulose ester resin comprising a poly(vinyl acetal) resin, an ethylene vinyl acetate resin, a polyurethane resin, or an ionomer resin;
- and
- (ii) 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 has a glass transition temperature (“Tg”) of at least 50° C. and not more than 250° C.;
- and
- (b) a non-cellulose ester layer;
- wherein an adhesive coating is interposed between the polymer layer and the non-cellulose ester layer;
- and
- wherein said multilayer interlayer exhibits a yellowness index of less than 1.5.
A multilayer interlayer comprising:
- (a) a polymer layer comprising a polymer blend,
- wherein said polymer blend comprises:
- (i) at least one non-cellulose ester resin comprising a poly(vinyl acetal) resin, an ethylene vinyl acetate resin, a polyurethane resin, or an ionomer resin;
- and
- (ii) at least one cellulose ester;
- wherein said polymer layer has a glass transition temperature (Tg) of at least 50° C., and
- wherein said polymer blend comprises at least 50 weight percent cellulose ester based on the total weight of said polymer blend;
- and
- (b) a non-cellulose ester layer.
A method for producing a multilayer interlayer, said method comprising:
- (a) forming a first layer comprising a polymer blend,
- wherein said polymer blend comprises
- (i) at least a non-cellulose ester resin comprising a poly(vinyl acetal) resin, an ethylene vinyl acetate resin, a polyurethane resin, or an ionomer resin;
- and
- (ii) at least one cellulose ester;
- (b) forming a second layer comprising a non-cellulose ester layer;
- and
- (c) contacting said first layer with said second layer to form said interlayer.
Dependencies are inferred from the claim text.