Monolithic interlayers of cellulose ester polyvinyl acetal polymer blends
AssigneeSolutia Inc.
InventorsAristotelis Karagiannis, Bruce Edward Wade, Khanh D. Tran, Michael Eugene Donelson
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Abstract
An monolithic interlayer with high stiffness and when laminated into a glass panel, the glass panel exhibits good clarity, while maintaining the processability of a polyvinyl acetal, such as polyvinyl butyral resin used to make the monolithic interlayer. The monolithic interlayer comprising a polymer blend of: (A) polyvinyl acetal (e.g. PVB); and (B) one or more cellulose esters. The polymer blend increases the structural strength to the monolithic interlayer by increasing the E′ modulus of the monolithic interlayer while optionally maintaining good optical clarity.
Claims23
A monolithic interlayer comprising a polymer blend of:
- (A) polyvinyl acetal (“poly(vinyl acetal)”);
- and
- (B) a cellulose ester (“CE”);
- 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 monolithic interlayer has a haze value of 4% or less;
- wherein said cellulose ester layer has a Tg of at least 50° C. and not more than 200° C.
A multilayer interlayer comprising:
- a first layer comprising a polymer blend of:
- (A) polyvinyl acetal (“poly(vinyl acetal)”);
- and
- (B) a cellulose ester (“CE”);
- and
- a second layer comprising a polymer different from the polymer blend of the first 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;
- wherein the interlayer has a haze value of 4% or less;
- wherein said cellulose ester layer has a Tg of at least 50° C. and not more than 200° C.
A glass panel comprising:
- at least one layer of glass;
- and
- an interlayer comprising a polymer blend of:
- (A) polyvinyl acetal (“poly(vinyl acetal)”);
- and
- (B) a cellulose ester (“CE”);
- wherein the percent haze of the glass panel is 4% or less.
Dependencies are inferred from the claim text.