Low distortion interlayer
First Claim
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1. A polymer sheet, comprising:
- poly(vinyl butyral); and
, a plasticizer, wherein said polymer sheet has a surface with a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of between 10 and 95.
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Abstract
The present invention is in the field of multiple layer glass panels comprising a polymer sheet having desirable surface properties, and more specifically, the present invention is in the field of multiple layer glass panels comprising poly(vinyl butyral) having a finished surface of relatively low waviness and high roughness disposed in contact with poly(ethylene terephthalate) and/or other poly(vinyl butyral) type layers.
26 Citations
26 Claims
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1. A polymer sheet, comprising:
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poly(vinyl butyral); and
,a plasticizer, wherein said polymer sheet has a surface with a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of between 10 and 95. - View Dependent Claims (2, 3, 4, 5)
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6. A method of producing a multiple layer interlayer, comprising the steps of:
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forming a first polymer sheet comprising poly(vinyl butyral) and a plasticizer, wherein said first polymer sheet has a first surface and a second surface and wherein said first surface has a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of between 10 and 95;
disposing a layer of polymer film in contact with said first surface of said first polymer sheet to form a stack; and
,laminating said stack. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of producing a polymer sheet, comprising:
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forming a layer comprising poly(vinyl butyral) and a plasticizer, wherein said layer has a first surface and a second surface and a waviness index of less than 20,000 square micrometers and an Rz value of less than 20 micrometers on said first surface, and embossing said layer on said first surface with a roughness pattern to produce said polymer sheet, wherein said polymer sheet has a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of between 10 and 95 on the side corresponding to said first surface of said layer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A method of producing a multiple layer panel, comprising the steps of:
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forming a first polymer sheet comprising poly(vinyl butyral) and a plasticizer, wherein said first polymer sheet has a first surface and a second surface and wherein said first surface has a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of between 10 and 95;
disposing a layer of polymer film in contact with said first surface of said first polymer sheet to form a stack;
disposing a layer of glass in contact with said polymer sheet opposite said polymer film; and
,laminating said stack.
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Specification