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US 2016/0159047 A1Published application
Poly(vinyl acetal) resin compositions, layers and interlayers having enhanced properties
AssigneeSolutia Inc.
InventorsYINONG MA, Nandan Ukidwe
Life of this patent
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Abstract
Resin compositions, layers, and interlayers comprising a poly(vinyl acetal) resin that includes residues of an aldehyde other than n-butyraldehyde are provided. Such compositions, layers, and interlayers can exhibit enhanced or optimized properties as compared to those formulated with comparable poly(vinyl n-butyral) resins.
Claims20
An interlayer comprising:
- a first resin layer comprising a first poly(vinyl acetal) resin and a first plasticizer;
- and
- a second resin layer adjacent to said first resin layer, wherein said second resin layer comprises a second poly(vinyl acetal) resin and a second plasticizer, wherein said second plasticizer is present in said second resin layer in an amount of at least 50 parts per hundred parts of resin (phr) and wherein the difference between the amount of said first plasticizer in said first resin layer and the amount of said second plasticizer in said second resin layer is more than 10 phr,
- wherein at least one of said first and said second poly(vinyl acetal) resins comprises at least 5 weight percent of residues of an aldehyde other than n-butyraldehyde, based on the total weight of aldehyde residues of said first or said second poly(vinyl acetal) resin, and
- wherein the glass transition temperature of said first resin layer is at least 3° C. higher than the glass transition temperature of said second resin layer, and wherein the absolute value of the difference between the refractive index of said first resin layer and the refractive index of said second resin layer is not more than 0.010.
2 more elements
An interlayer comprising:
- a first resin layer comprising a first poly(vinyl acetal) resin and a first plasticizer;
- and
- a second resin layer adjacent to said first resin layer, said second resin layer comprising a second poly(vinyl acetal) resin and a second plasticizer,
- wherein said interlayer meets at least one of the following criteria (i) through (iii) below—
- (i) said first poly(vinyl acetal) resin comprises at least 5 weight percent of residues of i-butyraldehyde, based on the total weight of aldehyde residues of said first poly(vinyl acetal) resin, and said second poly(vinyl acetal) resin comprises at least 10 weight percent of residues of an aldehyde having 6 or fewer carbon atoms, based on the total weight of aldehyde residues of said second poly(vinyl acetal) resin, wherein the refractive index of said first resin layer is at least 0.002 lower than the refractive index of a comparable poly(vinyl n-butyral) resin layer, and wherein the residual hydroxyl content of said second poly(vinyl acetal) resin is not more than 12 weight percent and the difference between the residual hydroxyl content of said first poly(vinyl acetal) resin and the residual hydroxyl content of said second poly(vinyl acetal) resin is at least 2 weight percent;
- (ii) said first poly(vinyl acetal) resin comprises at least 5 weight percent of residues of i-butyraldehyde, based on the total weight of aldehyde residues of said first poly(vinyl acetal) resin, and said second poly(vinyl acetal) resin comprises at least 10 weight percent of residues of an aldehyde having more than 6 carbon atoms, based on the total weight of aldehyde residues of said second poly(vinyl acetal) resin, wherein the residual hydroxyl content of said second poly(vinyl acetal) resin is at least 0.25 percent higher than the residual hydroxyl content of said first poly(vinyl acetal) resin, and wherein the amount of said second plasticizer in said second resin layer is at least 10 parts per hundred resin (phr) higher than the amount of said first plasticizer in said first resin layer;
- and
- (iii) neither of said first and said second poly(vinyl acetal) resins comprise residues of i-butyraldehyde and said second resin layer has a glass transition temperature that is at least 3° C. lower than the glass transition temperature of a comparable poly(vinyl n-butyral) resin layer.
5 more elements
A method of making an interlayer, said method comprising:
- (a) forming a first resin layer from a first poly(vinyl acetal) resin and a first plasticizer;
- (b) forming a second resin layer from a second poly(vinyl acetal) resin and a second plasticizer;
- and
- (c) producing said interlayer using said first resin layer and said second resin layer, wherein said first resin layer is adjacent to said second resin layer in said interlayer,
- wherein the glass transition temperature of said first resin layer is at least 3° C. higher than the glass transition temperature of said second resin layer, and wherein the difference between the refractive index of said first resin layer and the refractive index of said second resin layer is not more than 0.010.
2 more elements
Dependencies are inferred from the claim text.