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US 2019/0055391 A1Published application
Blends of poly(vinyl acetal) resins for compositions, layers, and interlayers having enhanced optical properties
AssigneeSolutia Inc.
InventorJun Lu
Life of this patent
Estimating the term…
Abstract
Resin compositions, layers, and interlayers comprising two or more poly(vinyl acetal) resins and at least one blending agent or haze reducing agent are provided. Such compositions, layers, and interlayers exhibit enhanced optical properties while retaining other properties, such as impact resistance and acoustic performance.
Claims20
An interlayer comprising:
- a resin layer comprising a blend of at least two poly(vinyl acetal) resins, a plasticizer, and at least one blending agent, wherein said resin layer has at least two glass transition temperatures, wherein the difference between the two glass transition temperatures is at least 5° C.;
- wherein said blending agent comprises one moiety that is more compatible with said first poly(vinyl acetal) resin than with said second poly(vinyl acetal) resin and a second moiety that is more compatible with the second poly(vinyl acetal) resin than with said first poly(vinyl acetal) resin, wherein said blending agent is present in said resin layer in an amount of at least 0.5 weight percent, based on the total weight of said resin layer.
An interlayer comprising at least one resin layer, said resin layer comprising a blend of:
- a first poly(vinyl acetal) resin;
- and
- a second poly(vinyl acetal) resin;
- wherein at least one of said first poly(vinyl acetal) resin and second poly(vinyl acetal) has a residual hydroxyl content of not more than 15 weight percent, wherein the difference in residual hydroxyl content between said first and said second poly(vinyl acetal) resins is at least 2 weight percent and/or wherein the second poly(vinyl acetal) difference in residual acetate content between said first and said second poly(vinyl acetal) resins is at least 2 weight percent;
- a plasticizer;
- a blending agent comprising one moiety that is more compatible with said first poly(vinyl acetal) resin than with said second poly(vinyl acetal) resin and a second moiety that is more compatible with the second poly(vinyl acetal) resin than with said first poly(vinyl acetal) resin, wherein said blending agent is present in said resin layer in an amount of at least 0.5 weight percent, based on the total weight of said resin layer.
3 more elements
An interlayer comprising:
- a first resin layer comprising a first poly(vinyl acetal) resin and a plasticizer;
- a second resin layer adjacent to said first resin layer, wherein said second resin layer comprises a blend of two poly(vinyl acetal) resins and at least one blending agent,
- a third resin layer adjacent to said second resin layer, wherein said third resin layer comprising a third poly(vinyl acetal) resin and a plasticizer;
- wherein one of said blend of two poly(vinyl acetal) resins has a residual hydroxyl content that is at least 2 weight percent higher or lower than the residual hydroxyl content of at least one of said first and said third poly(vinyl acetal) resin and/or wherein said one of said blend of two poly(vinyl acetal) resins has a residual acetate content that is at least 2 weight percent higher or lower than the residual acetate content of at least one of said first and said second poly(vinyl acetal) resin,
- wherein said blending agent comprises one moiety that is more compatible with said first poly(vinyl acetal) resin than with said second poly(vinyl acetal) resin and a second moiety that is more compatible with the second poly(vinyl acetal) resin than with said first poly(vinyl acetal) resin, wherein said blending agent is present in said resin layer in an amount of at least 0.5 weight percent, based on the total weight of said resin layer, and
- wherein said interlayer has a haze value of less than 5 percent.
3 more elements
Dependencies are inferred from the claim text.