Low distortion interlayer
AssigneeSolutia Inc.
InventorVincent J. Yacovone
Life of this patent
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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.
Claims26
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,
- wherein said polymer sheet is prepared by a method comprising the steps of:
- 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.
A method of producing a multiple layer interlayer, comprising the steps of:
- 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.
A method of producing a polymer sheet, comprising:
- 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.
A method of producing a multiple layer panel, comprising the steps of:
- 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.
Dependencies are inferred from the claim text.