Multiple layer polymer interlayers having a melt fractured...

B - Operations – Transporting – 32 – B

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B32B 17/10 (2006.01) B29C 47/00 (2006.01) C03C 27/12 (2006.01)

Patent

CA 2682689

The present invention provides multiple layer interlayers having a soft inner polymer 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 controlling the melt fracture that occurs at the exposed surface of the interlayer, or individual layers of the multiple layer interlayer, during formation of the interlayer. By precisely controlling the surface topography 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.

La présente invention concerne des intercalaires multicouches comportant une couche polymère intérieure souple et des couches extérieures relativement rigides pouvant être stratifiées sans distorsion optique indésirable et utilisées dans diverses applications du type panneaux de verre multicouche. Les couches intercalaires multicouches selon la présente invention présentent une topographie de surface qui est formée par le contrôle de marques de coulée qui se produisent à la surface de la couche intercalaire, ou des couches individuelles de la couche intercalaire multicouche, lors de la formation de la couche intercalaire. Grâce au contrôle précis de la topographie de surface de la couche intercalaire, la stratification de la couche intercalaire avec un substrat rigide n'entraîne pas de distorsion indésirable provoquée par le transfert de la topographie de surface à travers les couches extérieures rigides dans les couches intérieures plus souples de la couche intercalaire.

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