Polyvinyl acetal and cellulose ester multilayer interlayers
AssigneeSolutia Inc.
InventorsAristotelis Karagiannis, Bruce Edward Wade, Khanh D. Tran, 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.
Claims18
A multilayer interlayer comprising:
- (A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin;
- and
- (B) one or more cellulose ester (“CE”) layers comprising cellulose esters;
- and
- (C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin;
- wherein at least one CE layer is disposed between the first and second poly(vinyl acetal) layers”);
- wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin;
- wherein the Tg of the first and second poly(vinyl acetal) layers is at least 30° C. less than the Tg of the at least one CE layer.
A glass panel comprising a multilayer interlayer disposed between two glass substrates, said multilayer interlayer comprising:
- (A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin;
- and
- (B) one or more cellulose ester (“CE”) layers comprising cellulose esters;
- and
- (C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin;
- wherein at least one CE layer is disposed between the first and second poly(vinyl acetal) layers, and the glass panel has a haze value of 5% or less;
- wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin.
A multilayer interlayer comprising:
- (A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin;
- and
- (B) one or more cellulose ester (“CE”) layers comprising cellulose esters;
- and
- (C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin;
- wherein the Tg of the first and second poly(vinyl acetal) layers is at least 30° C. less than the Tg of the at least one CE layer;
- wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin.
Dependencies are inferred from the claim text.