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Multiple layer polymer interlayers having an embossed surface

a polymer interlayer and embossed surface technology, applied in the field of polymer interlayers and multiple layer glass panels comprising polymer interlayers, can solve the problems of developing optical distortion, multi-layer interlayers, and three-layer interlayers

Inactive Publication Date: 2008-10-30
SOLUTIA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]The present invention provides multiple layer interlayers having a relatively soft inner layer and relatively stiff outer layers that can be laminated without unacceptable optical distortion and used in various multiple layer glass panel type applications.
[0008]By precisely controlling the embossing of the interlayer, lamination of the interlayer with a rigid substrate does not lead to unacceptable optical distortion caused by the transfer of the surface topography through outer, stiffer layers into softer, internal layers of the interlayer.

Problems solved by technology

A particular problem encountered with multiple layer interlayers arises at the lamination stage of processing.
While single layer interlayers have conventionally been embossed with rollers to impart a texture that facilitates deairing, three layer interlayers having a relatively soft inner layer between two relatively stiff layers can develop optical distortion if embossing of the outer surfaces of the interlayer is transferred to the inner, softer layer.

Method used

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  • Multiple layer polymer interlayers having an embossed surface
  • Multiple layer polymer interlayers having an embossed surface
  • Multiple layer polymer interlayers having an embossed surface

Examples

Experimental program
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Effect test

example 1

[0095]Two, three-layer interlayer samples are separately coextruded in a length that can be later cut into three separate interlayers. Each interlayer comprises a 0.1524 millimeter (6 mil) layer sandwiched between two 0.3302 millimeters (13 mil) layers for a total thickness of 0.8128 millimeters (32 mils). The inner layer comprises 75 phr plasticizer (triethylene glycol di-(2-ethylhexanoate)) and 11.0% residual polyvinyl alcohol, while the outside layers comprise 38 phr plasticizer (triethylene glycol di-(2-ethylhexanoate)) and 18.5% residual polyvinyl alcohol.

[0096]Surface characteristics of the two interlayer samples are controlled during coextrusion with melt fracture to provide differing levels of RZ. The first interlayer—sample A—has an RZ of about 20. The second interlayer—sample B—has an RZ of about 40. The exact RZ values are given in Table 1, where “CMD” is cross machine direction and “MD” is machine direction and where measurements from both sides of each interlayer are sh...

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Abstract

The present invention provides multiple layer interlayers having a relatively soft inner layer and relatively stiff outer layers that can be laminated without unacceptable optical distortion and used in various multiple layer glass panel type applications.Multiple layer interlayers of the present invention have surface topography that is formed by embossing the exposed surface of the interlayer, or individual layers of the multiple layer interlayer, after formation of the interlayer or layers. The embossing process is carried out under temperature conditions that prevent the transfer of the embossing to inner layers of the interlayer.By precisely controlling the embossing of the interlayer, lamination of the interlayer with a rigid substrate does not lead to unacceptable optical distortion caused by the transfer of the surface topography through outer, stiffer layers into softer, internal layers of the interlayer.

Description

FIELD OF THE INVENTION[0001]The present invention is in the field of polymer interlayers and multiple layer glass panels comprising polymer interlayers, and, more specifically, the present invention is in the field of polymer interlayers comprising multiple thermoplastic polymer layers.BACKGROUND[0002]Poly(vinyl butyral) (PVB) is commonly used in the manufacture of polymer layers that can be used as interlayers in light-transmitting laminates such as safety glass or polymeric laminates. Safety glass often refers to a transparent laminate comprising a poly(vinyl butyral) layer disposed between two sheets of glass. Safety glass often is used to provide a transparent barrier in architectural and automotive openings. Its main function is to absorb energy, such as that caused by a blow from an object, without allowing penetration through the opening or the dispersion of shards of glass, thus minimizing damage or injury to the objects or persons within an enclosed area. Safety glass also ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/16B29C59/00B32B9/00
CPCB32B17/10587B32B17/10761B32B37/153B32B38/06Y10T428/24612Y10T428/24355Y10T428/254Y10T428/24405B32B2329/06B32B2250/03Y10T428/31627Y10T428/31946Y10T428/3163B32B27/30B32B3/30C03C27/10
Inventor BOURCIER, DAVID PAULD'ERRICO, JOHN JOSEPHETIENNE, JEAN-PIERREMATIS, GARYYACOVONE, VINCENT JAMES
Owner SOLUTIA INC
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