Polyvinyl acetal and cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsAristotelis Karagiannis, Bruce Edward Wade, Michael Eugene Donelson
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Abstract
A multilayer interlayer structure having a first and second polyvinyl acetal (poly(vinyl acetal)) layer and a cellulose ester layer having a thickness of at least 10 mils disposed between the first and second poly(vinyl acetal) layers. The cellulose ester layer can have a higher storage modulus and/or higher Tg than at least one of the poly(vinyl acetal) layers. The interlayer structure is useful to make glass panels having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.
Claims10
A multilayer interlayer comprising at least one cellulose ester layer comprising a cellulose ester, wherein said cellulose ester has a hydroxyl content of 0.5-30 weight percent based on the weight of the cellulose ester;
- wherein said cellulose ester is a mixed cellulose ester comprising at least two different acyl groups;
- wherein said cellulose ester layer has a Tg of at least 50° C. and not more than 250° C.
A multilayer interlayer comprising:
- (a) a poly(vinyl acetal) layer comprising at least one poly(vinyl acetal) resin, wherein said poly(vinyl acetal) resin has a residual hydroxyl content in the range of 6 to 35 weight percent as measured according to ASTM D1396, a plasticizer, and a glass transition temperature (“Tg”) in the range of −20 to 65° C.;
- and
- (b) a cellulose ester layer comprising at least one cellulose ester.
Dependencies are inferred from the claim text.